Kubernetes 进阶教程
Kubernetes 进阶教程
一、 服务探针
对线上业务来说，保证服务的正常稳定是重中之重，对故障服务的及时处理避免影响业务以及快速恢复一直 是开发运维的难点。Kubernetes 提供了健康检查服务，对于检测到故障服务会被及时自动下线，以及通过重启服 务的方式使服务自动恢复。
1、 存活性探测（LivenessProbe）
用于判断容器是否存活，即 Pod 是否为 running 状态，如果 LivenessProbe 探针探测到容器不健康，则 kubelet 将 kill 掉容器，并根据容器的重启策略判断按照那种方式重启，如果一个容器不包含 LivenessProbe 探针，则 Kubelet 认为容器的 LivenessProbe 探针的返回值永远成功。存活性探测支持的方法有三种:ExecAction，TCPSocketAction， HTTPGetAction。
注意：存活性检查，检测容器是否可以正常运行
1.2Exec方式
# 存活性探测 Exec方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
exec:
command:
- cat
- /usr/share/nginx/html/index.html
initialDelaySeconds: 8 # 启动8后开始探测
timeoutSeconds: 3 # 每次执行探测超市时间，默认为1秒
failureThreshold: 2 # 探测两次，认为服务失败
periodSeconds: 3 # 探测的频率（3s一次）
successThreshold: 2 # 探测两次以上成功，才认为服务成功
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f livenessprobe_exec_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 41d
nginx NodePort 10.96.106.13 <none> 80:26755/TCP 32d
test-deployment-svc NodePort 10.96.120.163 <none> 80:30001/TCP 5s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6fb857b989-84pbb 1/1 Running 0 14s
test-deployment-6fb857b989-bvdqx 1/1 Running 0 14s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-6fb857b989-84pbb
Name: test-deployment-6fb857b989-84pbb
Namespace: default
Priority: 0
Node: kubernetes-node-02/172.16.0.54
Start Time: Sat, 13 Mar 2021 00:35:41 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=6fb857b989
Annotations: <none>
Status: Running
IP: 10.242.176.2
IPs:
IP: 10.242.176.2
Controlled By: ReplicaSet/test-deployment-6fb857b989
Containers:
nginx:
Container ID: docker://ff571a7c8a31fecf884fc10dfc26cbed0c9a2a9b78a3065afeecd12f38c3a946
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Sat, 13 Mar 2021 00:35:42 +0800
Ready: True
Restart Count: 0
Liveness: exec [cat /usr/share/nginx/html/index.html] delay=8s timeout=3s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 31s default-scheduler Successfully assigned default/test-deployment-6fb857b989-84pbb to kubernetes-node-02
Normal Pulled 30s kubelet Container image "nginx:latest" already present on machine
Normal Created 30s kubelet Created container nginx
Normal Started 30s kubelet Started container nginx
# 进入pods查看内容
[root@kubernetes-master-01 ~]# kubectl exec -it test-deployment-6fb857b989-84pbb -- bash
root@test-deployment-6fb857b989-84pbb:/# cd /usr/share/nginx/html/
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# ls
50x.html index.html
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html#
## 删除pods nginx目录下面的index.html文件
[root@kubernetes-master-01 ~]# kubectl exec -it test-deployment-6fb857b989-84pbb -- bash
root@test-deployment-6fb857b989-84pbb:/# cd /usr/share/nginx/html/
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# ls
50x.html index.html
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html#
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# rm -rf index.html
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# command terminated with exit code 137
# 再次查看 （pods被重启了,容器被重新启动了一个）
[root@kubernetes-master-01 ~]# kubectl exec -it test-deployment-6fb857b989-84pbb -- bash
root@test-deployment-6fb857b989-84pbb:/# cd /usr/share/nginx/html/
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# ll
bash: ll: command not found
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html# ls
50x.html index.html
root@test-deployment-6fb857b989-84pbb:/usr/share/nginx/html#
1.2、 TCPSocket
# 存活性探测 TCPSocket方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
tcpSocket:
port: 80
initialDelaySeconds: 8
timeoutSeconds: 3
replicas: 2
---
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f livenessprobe_tctsocket_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-86c57db685-xnstd 1/1 Running 5 32d
nginx-pod 1/1 Running 4 5d7h
test-deployment-5596f9cbc7-nsxx8 1/1 Running 0 6s
test-deployment-5596f9cbc7-t4hv4 1/1 Running 0 6s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5596f9cbc7-nsxx8 1/1 Running 0 16s
test-deployment-5596f9cbc7-t4hv4 1/1 Running 0 16s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5596f9cbc7-nsxx8 1/1 Running 0 51s
test-deployment-5596f9cbc7-t4hv4 1/1 Running 0 51s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-5596f9cbc7-nsxx8
Name: test-deployment-5596f9cbc7-nsxx8
Namespace: default
Priority: 0
Node: kubernetes-node-01/172.16.0.53
Start Time: Sat, 13 Mar 2021 00:51:14 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=5596f9cbc7
Annotations: <none>
Status: Running
IP: 10.241.56.2
IPs:
IP: 10.241.56.2
Controlled By: ReplicaSet/test-deployment-5596f9cbc7
Containers:
nginx:
Container ID: docker://b238423c7b7e9148fc513ff553bdb2ff8599ae8b71966d923ffef9e49ccdc539
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Sat, 13 Mar 2021 00:51:15 +0800
Ready: True
Restart Count: 0
Liveness: tcp-socket :80 delay=8s timeout=3s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 66s default-scheduler Successfully assigned default/test-deployment-5596f9cbc7-nsxx8 to kubernetes-node-01
Normal Pulled 66s kubelet Container image "nginx:latest" already present on machine
Normal Created 66s kubelet Created container nginx
Normal Started 66s kubelet Started container nginx
修改错误端口
# 存活性探测 TCPSocket方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
tcpSocket:
port: 8099 # 修改错误监听端口
initialDelaySeconds: 8
timeoutSeconds: 3
replicas: 2
---
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f livenessprobe_tctsocket_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6c945c9cdc-n5zsl 1/1 Running 0 13s
test-deployment-6c945c9cdc-zmqsq 1/1 Running 0 13s
# 重启了两次
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6c945c9cdc-n5zsl 1/1 Running 2 79s
test-deployment-6c945c9cdc-zmqsq 1/1 Running 2 79s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6c945c9cdc-n5zsl 1/1 Running 5 3m26s
test-deployment-6c945c9cdc-zmqsq 1/1 Running 5 3m26s
1.3、 HTTPGet
# 存活性探测 HTTPGet方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
httpGet:
port: 80
path: /
host: 127.0.0.1
scheme: HTTP
# 定义副本pod数量
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
[root@kubernetes-master-01 ~]# kubectl delete -f deployment.yaml
deployment.apps "test-deployment" deleted
service "test-deployment-svc" deleted
[root@kubernetes-master-01 ~]# kubectl apply -f deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods -l pro=dev
No resources found in default namespace.
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-8c6b557b5-bfdjm 1/1 Running 0 27s
test-deployment-8c6b557b5-vpjz6 1/1 Running 0 27s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-8c6b557b5-bfdjm
Name: test-deployment-8c6b557b5-bfdjm
Namespace: default
Priority: 0
Node: kubernetes-node-01/172.16.0.53
Start Time: Sat, 13 Mar 2021 00:05:43 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=8c6b557b5
Annotations: <none>
Status: Running
IP: 10.241.56.2
IPs:
IP: 10.241.56.2
Controlled By: ReplicaSet/test-deployment-8c6b557b5
Containers:
nginx:
Container ID: docker://d213a624a6c79cbeef234b565ca0430fa3be4713fbdd3f31afd1da01ba51dbbc
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Sat, 13 Mar 2021 00:05:45 +0800
Ready: True
Restart Count: 0
Liveness: http-get http://:80/ delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 2m11s default-scheduler Successfully assigned default/test-deployment-8c6b557b5-bfdjm to kubernetes-node-01
Normal Pulled 2m11s kubelet Container image "nginx:latest" already present on machine
Normal Created 2m10s kubelet Created container nginx
Normal Started 2m10s kubelet Started container nginx
修改检测错误的端口
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
httpGet:
port: 8080 # 修改探测不存在端口
path: /
# 定义副本pod数量
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl delete -f deployment.yaml
deployment.apps "test-deployment" deleted
ku cservice "test-deployment-svc" deleted
[root@kubernetes-master-01 ~]# kubectl apply -f deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods dev=pro
Error from server (NotFound): pods "dev=pro" not found
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5b78dcf669-2nvwm 0/1 ContainerCreating 0 23s
test-deployment-5b78dcf669-cd6xd 1/1 Running 0 23s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5b78dcf669-2nvwm 1/1 Running 0 47s
test-deployment-5b78dcf669-cd6xd 1/1 Running 1 47s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5b78dcf669-2nvwm 1/1 Running 1 96s
test-deployment-5b78dcf669-cd6xd 1/1 Running 3 96s
# 查看pods的状态,不断的重启pods
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5b78dcf669-2nvwm 0/1 CrashLoopBackOff 6 7m40s
test-deployment-5b78dcf669-cd6xd 0/1 CrashLoopBackOff 6 7m40s
# 查看执行的结果
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-5b78dcf669-2nvwm
Name: test-deployment-5b78dcf669-2nvwm
Namespace: default
Priority: 0
Node: kubernetes-master-03/172.16.0.52
Start Time: Sat, 13 Mar 2021 00:13:17 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=5b78dcf669
Annotations: <none>
Status: Running
IP: 10.241.136.3
IPs:
IP: 10.241.136.3
Controlled By: ReplicaSet/test-deployment-5b78dcf669
Containers:
nginx:
Container ID: docker://f61694864cf7c9faf1ca1e7ffede5297dc14ffae0acd2a42138bc744e8fc85f6
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Waiting
Reason: CrashLoopBackOff
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Sat, 13 Mar 2021 00:15:58 +0800
Finished: Sat, 13 Mar 2021 00:16:28 +0800
Ready: False
Restart Count: 4
Liveness: http-get http://:8080/ delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 3m46s default-scheduler Successfully assigned default/test-deployment-5b78dcf669-2nvwm to kubernetes-master-03
Normal Pulled 95s (x4 over 3m5s) kubelet Container image "nginx:latest" already present on machine
Normal Created 95s (x4 over 3m5s) kubelet Created container nginx
Normal Started 95s (x4 over 3m4s) kubelet Started container nginx
Normal Killing 95s (x3 over 2m35s) kubelet Container nginx failed liveness probe, will be restarted
Warning Unhealthy 85s (x10 over 2m55s) kubelet Liveness probe failed: Get http://10.241.136.3:8080/: dial tcp 10.241.136.3:8080: connect: connection refused
1.4、 参数详解
- failureThreshold：最少连续几次探测失败的次数，满足该次数则认为 fail
- initialDelaySeconds：容器启动之后开始进行存活性探测的秒数。不填立即进行
- periodSeconds：执行探测的频率（秒）。默认为 10 秒。最小值为 1。
- successThreshold：探测失败后，最少连续探测成功多少次才被认定为成功，满足该次数则认为 success。（但 是如果是 liveness 则必须是 1。最小值是 1。）
- timeoutSeconds：每次执行探测的超时时间，默认 1
2、 就绪性探测
用于判断容器是否正常提供服务，即容器的 Ready 是否为 True，是否可以接收请求，如果 ReadinessProbe 探测失败，则容器的 Ready 将设置为 False，控制器将此 Pod 的 Endpoint 从对应的 service 的 Endpoint 列表中移除， 从此不再将任何请求调度此 Pod 上，直到下次探测成功。（剔除此 pod,不参与接收请求不会将流量转发给此 Pod
注：就绪性检查，探测当前服务是否正常对外提供服务
探测失败
2.1、 HTTPGet
通过访问某个 URL 的方式探测当前 POD 是否可以正常对外提供服务。
# 就绪性探测 HTTPGet方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
readinessProbe:
httpGet:
port: 80
path: /
# host: 127.0.0.1 写这个Ip会探测失败，探测ip是pods的ip
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
# 创建Pods
[root@kubernetes-master-01 ~]# kubectl apply -f readinessprobe_httpget_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
# 查看创建pods
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-7bc4d875fc-ghwpb 1/1 Running 0 31s
test-deployment-7bc4d875fc-v4w6r 1/1 Running 0 31s
# 查看pods详细信息
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-7bc4d875fc-ghwpb
Name: test-deployment-7bc4d875fc-ghwpb
Namespace: default
Priority: 0
Node: kubernetes-node-01/172.16.0.53
Start Time: Mon, 15 Mar 2021 08:21:23 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=7bc4d875fc
Annotations: <none>
Status: Running
IP: 10.241.32.2
IPs:
IP: 10.241.32.2
Controlled By: ReplicaSet/test-deployment-7bc4d875fc
Containers:
nginx:
Container ID: docker://c24f2345de24d32314dee1d1e55c698d849618b692fbf953e0dbd28e1f587f39
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 15 Mar 2021 08:21:24 +0800
Ready: True
Restart Count: 0
Readiness: http-get http://:80/ delay=0s timeout=1s period=10s #success=1 #failure=3 就绪探测HTTPGet方式
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True # 探测为True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 2m default-scheduler Successfully assigned default/test-deployment-7bc4d875fc-ghwpb to kubernetes-node-01
Normal Pulled 119s kubelet Container image "nginx:latest" already present on machine
Normal Created 119s kubelet Created container nginx
Normal Started 119s kubelet Started container nginx
# 查看svc
[root@kubernetes-master-01 ~]# kubectl describe svc test-deployment-svc
Name: test-deployment-svc
Namespace: default
Labels: <none>
Annotations: Selector: app=nginx,dev=pro
Type: NodePort
IP: 10.96.27.250
Port: <unset> 80/TCP
TargetPort: 80/TCP
NodePort: <unset> 30001/TCP
Endpoints: 10.241.216.3:80,10.241.32.3:80
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
修改监听错误端口
# 就绪性探测 HTTPGet方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
readinessProbe:
httpGet:
port: 8080 # 修改监听错误端口
path: /
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f readinessprobe_httpget_deployment.yaml
deployment.apps/test-deployment configured
service/test-deployment-svc unchanged
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-5975846857-4f6xq 0/1 Running 0 10s
test-deployment-5975846857-h6fp9 0/1 Running 0 11s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-5975846857-7x7qp
Name: test-deployment-5975846857-7x7qp
Namespace: default
Priority: 0
Node: kubernetes-master-03/172.16.0.52
Start Time: Mon, 15 Mar 2021 08:30:42 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=5975846857
Annotations: <none>
Status: Running
IP: 10.242.176.3
IPs:
IP: 10.242.176.3
Controlled By: ReplicaSet/test-deployment-5975846857
Containers:
nginx:
Container ID: docker://4dd97b86321fb715b4003495559012cfe579ef400e1fbdd15c00011f37849ba6
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 15 Mar 2021 08:30:43 +0800
Ready: False
Restart Count: 0
Readiness: http-get http://:8080/ delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 41s default-scheduler Successfully assigned default/test-deployment-5975846857-7x7qp to kubernetes-master-03
Normal Pulled 40s kubelet Container image "nginx:latest" already present on machine
Normal Created 40s kubelet Created container nginx
Normal Started 40s kubelet Started container nginx
Warning Unhealthy 5s (x4 over 35s) kubelet Readiness probe failed: Get http://10.242.176.3:8080/: dial tcp 10.242.176.3:8080: connect: connection refused
[root@kubernetes-master-01 ~]# kubectl describe svc test-deployment-svc
Name: test-deployment-svc
Namespace: default
Labels: <none>
Annotations: Selector: app=nginx,dev=pro
Type: NodePort
IP: 10.96.27.250
Port: <unset> 80/TCP
TargetPort: 80/TCP
NodePort: <unset> 30001/TCP
Endpoints:
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
2.2、 Exec
通过执行一条命令，探测服务是否可以正常对外提供服务。
# 就绪性探测 Exec方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 就绪性探针
readinessProbe:
exec:
command:
- cat
- /usr/share/nginx/html/index.html
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f readinessprobe_exec_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6559f99565-2dkqg 1/1 Running 0 13s
test-deployment-6559f99565-5rq2l 0/1 Running 0 13s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-6559f99565-2dkqg 1/1 Running 0 19s
test-deployment-6559f99565-5rq2l 1/1 Running 0 19s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-6559f99565-2dkqg
Name: test-deployment-6559f99565-2dkqg
Namespace: default
Priority: 0
Node: kubernetes-node-02/172.16.0.54
Start Time: Mon, 15 Mar 2021 22:13:13 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=6559f99565
Annotations: <none>
Status: Running
IP: 10.241.216.2
IPs:
IP: 10.241.216.2
Controlled By: ReplicaSet/test-deployment-6559f99565
Containers:
nginx:
Container ID: docker://f775b67819ec8f985fffe8b29b5d4eb92c9a9649142b7feaa4aa67feab31c986
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 15 Mar 2021 22:13:14 +0800
Ready: True
Restart Count: 0
Readiness: exec [cat /usr/share/nginx/html/index.html] delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 30s default-scheduler Successfully assigned default/test-deployment-6559f99565-2dkqg to kubernetes-node-02
Normal Pulled 30s kubelet Container image "nginx:latest" already present on machine
Normal Created 30s kubelet Created container nginx
Normal Started 30s kubelet Started container nginx
2.3、 TCPSocket
通过 ping 某个端口的方式，探测服务是否可以正常对外提供服务。
# 就绪性探测 TCPSocket方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 就绪性探针
readinessProbe:
tcpSocket:
port: 80
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
[root@kubernetes-master-01 ~]# kubectl apply -f readinessprobe_tcpsocket_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-8578584455-b5pg5 0/1 Running 0 9s
test-deployment-8578584455-dkx4d 1/1 Running 0 9s
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-8578584455-b5pg5 1/1 Running 0 50s
test-deployment-8578584455-dkx4d 1/1 Running 0 50s
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-8578584455-b5pg5
Name: test-deployment-8578584455-b5pg5
Namespace: default
Priority: 0
Node: kubernetes-node-02/172.16.0.54
Start Time: Mon, 15 Mar 2021 22:17:59 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=8578584455
Annotations: <none>
Status: Running
IP: 10.241.216.2
IPs:
IP: 10.241.216.2
Controlled By: ReplicaSet/test-deployment-8578584455
Containers:
nginx:
Container ID: docker://a41f30b00fef1467074c2ecb1fe9137d8a2b29f606f7ad7712f7081ebb0bb568
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 15 Mar 2021 22:18:00 +0800
Ready: True
Restart Count: 0
Readiness: tcp-socket :80 delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 63s default-scheduler Successfully assigned default/test-deployment-8578584455-b5pg5 to kubernetes-node-02
Normal Pulled 63s kubelet Container image "nginx:latest" already present on machine
Normal Created 63s kubelet Created container nginx
Normal Started 62s kubelet Started container nginx
3、 回调 HOOK
实际上 Kubernetes 为我们的容器提供了生命周期钩子的，就是我们说的 Pod Hook，Pod Hook 是由 kubelet 发起的，当容器中的进程启动前或者容器中的进程终止之前运行，这是包含在容器的生命周期之中。我们可以同 时为 Pod 中的所有容器都配置 hook。 Kubernetes 为我们提供了两种钩子函数：
- PostStart(创建容器成功一瞬间)：这个钩子在容器创建后立即执行。但是，并不能保证钩子将在容器 ENTRYPOINT 之前运行，因为 没有参数传递给处理程序。主要用于资源部署、环境准备等。不过需要注意的是如果钩子花费太长时间以至 于不能运行或者挂起， 容器将不能达到 running 状态。（可用于开始的时候下载密钥）
- PreStop：这个钩子在容器终止之前立即被调用。它是阻塞的，意味着它是同步的， 所以它必须在删除容器 的调用发出之前完成。主要用于优雅关闭应用程序、通知其他系统等。如果钩子在执行期间挂起， Pod 阶 段将停留在 running 状态并且永不会达到 failed 状态。(停止容器的时候删除密钥,保证相对安全,对保密的数据)
如果 PostStart 或者 PreStop 钩子失败， 它会杀死容器。所以我们应该让钩子函数尽可能的轻量。当然有些 情况下，长时间运行命令是合理的， 比如在停止容器之前预先保存状态
apiVersion: v1
kind: Pod
metadata:
name: hook-demo1
spec:
containers:
- name: hook-dem
image: nginx
lifecycle:
postStart:
exec:
command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
案例
# 回调钩子HOOK PostStart方式
# 定义资源类型
kind: Deployment
# 指定API版本号
apiVersion: apps/v1
# 元信息
metadata:
namespace: default
name: test-deployment
labels:
app: test-deployment
spec:
# 选择器
selector:
# 精确匹配
matchLabels:
app: nginx
dev: pro
# 定义pod的模板
template:
metadata:
# 跟matchlabels精确匹配只能多不能少
labels:
app: nginx
dev: pro
name: randysun
spec:
containers:
- name: nginx # 容器名称
image: nginx:latest
imagePullPolicy: IfNotPresent # 拉取镜像规则
# 存活性探针
livenessProbe:
exec:
command:
- cat
- /usr/share/nginx/html/demo.html
# 回调钩子
lifecycle:
postStart: # 容器创建后立刻执行
exec:
command:
- touch # 命令容器中一定是存在的
- /usr/share/nginx/html/demo.html
replicas: 2
---
kind: Service
apiVersion: v1
metadata:
name: test-deployment-svc
spec:
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30001
selector: # 选择器与label一样只能多不能少
app: nginx
dev: pro
执行
# 创建Pods
[root@kubernetes-master-01 ~]# kubectl apply -f hook_poststart_deployment.yaml
deployment.apps/test-deployment created
service/test-deployment-svc created
# 查看pods
[root@kubernetes-master-01 ~]# kubectl get pods -l dev=pro
NAME READY STATUS RESTARTS AGE
test-deployment-68cffdb664-258f6 1/1 Running 0 8s
test-deployment-68cffdb664-2pj89 1/1 Running 0 8s
# 查看详细信息
[root@kubernetes-master-01 ~]# kubectl describe pods test-deployment-68cffdb664-2pj89
Name: test-deployment-68cffdb664-2pj89
Namespace: default
Priority: 0
Node: kubernetes-node-02/172.16.0.54
Start Time: Mon, 15 Mar 2021 08:57:41 +0800
Labels: app=nginx
dev=pro
name=randysun
pod-template-hash=68cffdb664
Annotations: <none>
Status: Running
IP: 10.241.216.2
IPs:
IP: 10.241.216.2
Controlled By: ReplicaSet/test-deployment-68cffdb664
Containers:
nginx:
Container ID: docker://5dbbb508735a9535f209c524935d50b2a5d490755e0a5cf3ebfb473ef93b67cc
Image: nginx:latest
Image ID: docker-pullable://nginx@sha256:10b8cc432d56da8b61b070f4c7d2543a9ed17c2b23010b43af434fd40e2ca4aa
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 15 Mar 2021 08:57:42 +0800
Ready: True
Restart Count: 0
Liveness: exec [cat /usr/share/nginx/html/demo.html] delay=0s timeout=1s period=10s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-xt6cs (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-xt6cs:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-xt6cs
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 360s
node.kubernetes.io/unreachable:NoExecute for 360s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 78s default-scheduler Successfully assigned default/test-deployment-68cffdb664-2pj89 to kubernetes-node-02
Normal Pulled 78s kubelet Container image "nginx:latest" already present on machine
Normal Created 78s kubelet Created container nginx
Normal Started 78s kubelet Started container nginx
# 进入容器中查看创建的demo.html文件
[root@kubernetes-master-01 ~]# kubectl exec -it test-deployment-68cffdb664-2pj89 -- bash
root@test-deployment-68cffdb664-2pj89:/# cd /usr/share/nginx/html/
root@test-deployment-68cffdb664-2pj89:/usr/share/nginx/html# ls
50x.html demo.html index.html
root@test-deployment-68cffdb664-2pj89:/usr/share/nginx/html# ls -l
total 8
-rw-r--r--. 1 root root 494 Dec 15 13:59 50x.html
-rw-r--r--. 1 root root 0 Mar 15 00:57 demo.html
-rw-r--r--. 1 root root 612 Dec 15 13:59 index.html
root@test-deployment-68cffdb664-2pj89:/usr/share/nginx/html# date
Mon Mar 15 01:00:43 UTC 2021
root@test-deployment-68cffdb664-2pj89:/usr/share/nginx/html#
二、 K8S 监控组件 metrics-server
1、 创建用户
Metrics-server 需要读取 kubernetes 中数据，所以需要创建一个有权限的用户来给 metrics-server 使用。
[root@kubernetes-master-01 ~]# kubectl create clusterrolebinding system:anonymous --clusterrole=cluster-admin --user=system:anonymous
2、 创建配置文件
# # K8S 监控组件 metrics-server
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:aggregated-metrics-reader
labels:
rbac.authorization.k8s.io/aggregate-to-view: "true"
rbac.authorization.k8s.io/aggregate-to-edit: "true"
rbac.authorization.k8s.io/aggregate-to-admin: "true"
rules:
- apiGroups: ["metrics.k8s.io"]
resources: ["pods", "nodes"]
verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: metrics-server:system:auth-delegator
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:auth-delegator
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: metrics-server-auth-reader
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
name: v1beta1.metrics.k8s.io
spec:
groupPriorityMinimum: 100
service:
name: metrics-server
namespace: kube-system
versionPriority: 100
group: metrics.k8s.io
version: v1beta1
insecureSkipTLSVerify: true
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: metrics-server
namespace: kube-system
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: metrics-server
namespace: kube-system
labels:
k8s-app: metrics-server
spec:
selector:
matchLabels:
k8s-app: metrics-server
template:
metadata:
name: metrics-server
labels:
k8s-app: metrics-server
spec:
serviceAccountName: metrics-server
volumes:
# mount in tmp so we can safely use from-scratch images and/or read-only containers
- name: tmp-dir
emptyDir: {}
- name: ca-ssl
hostPath:
path: /etc/kubernetes/ssl
containers:
- name: metrics-server
image: registry.cn-hangzhou.aliyuncs.com/k8sos/metrics-server:v0.4.1
imagePullPolicy: IfNotPresent
args:
- --cert-dir=/tmp
- --secure-port=4443
- --metric-resolution=30s
- --kubelet-insecure-tls
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --requestheader-username-headers=X-Remote-User
- --requestheader-group-headers=X-Remote-Group
- --requestheader-extra-headers-prefix=X-Remote-Extra-
ports:
- name: main-port
containerPort: 4443
protocol: TCP
securityContext:
readOnlyRootFilesystem: true
runAsNonRoot: true
runAsUser: 1000
volumeMounts:
- name: tmp-dir
mountPath: /tmp
- name: ca-ssl
mountPath: /etc/kubernetes/ssl
nodeSelector:
kubernetes.io/os: linux
---
apiVersion: v1
kind: Service
metadata:
name: metrics-server
namespace: kube-system
labels:
kubernetes.io/name: "Metrics-server"
kubernetes.io/cluster-service: "true"
spec:
selector:
k8s-app: metrics-server
ports:
- port: 443
protocol: TCP
targetPort: main-port
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:metrics-server
rules:
- apiGroups:
- ""
resources:
- pods
- nodes
- nodes/stats
- namespaces
- configmaps
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:metrics-server
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:metrics-server
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
2.1、 复制上面的配置文件，创建对应的服务
kubectl apply -f components-metrics-server.yaml
kubectl get pods -n kube-system
[root@kubernetes-master-01 ~]# kubectl apply -f components-metrics-server.yaml
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
serviceaccount/metrics-server created
deployment.apps/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
[root@kubernetes-master-01 ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-6f5774d776-92h9j 1/1 Running 7 37d
metrics-server-787d9dbb5d-6fr6b 1/1 Running 0 17s
[root@kubernetes-master-01 ~]# kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
kubernetes-master-01 914m 91% 1180Mi 62%
kubernetes-master-03 86m 8% 1321Mi 70%
kubernetes-master02 325m 32% 1376Mi 73%
kubernetes-node-01 17m 1% 676Mi 35%
kubernetes-node-02 16m 1% 475Mi 25%
如果出现问题
kubectl get apiservices
[root@kubernetes-master-01 ~]# kubectl get apiservices
NAME SERVICE AVAILABLE AGE
v1. Local True 46d
v1.admissionregistration.k8s.io Local True 46d
v1.apiextensions.k8s.io Local True 46d
v1.apps Local True 46d
v1.authentication.k8s.io Local True 46d
v1.authorization.k8s.io Local True 46d
v1.autoscaling Local True 46d
v1.batch Local True 46d
v1.coordination.k8s.io Local True 46d
v1.networking.k8s.io Local True 46d
v1.rbac.authorization.k8s.io Local True 46d
v1.scheduling.k8s.io Local True 46d
v1.storage.k8s.io Local True 46d
v1beta1.admissionregistration.k8s.io Local True 46d
v1beta1.apiextensions.k8s.io Local True 46d
v1beta1.authentication.k8s.io Local True 46d
v1beta1.authorization.k8s.io Local True 46d
v1beta1.batch Local True 46d
v1beta1.certificates.k8s.io Local True 46d
v1beta1.coordination.k8s.io Local True 46d
v1beta1.discovery.k8s.io Local True 46d
v1beta1.events.k8s.io Local True 46d
v1beta1.extensions Local True 46d
v1beta1.metrics.k8s.io kube-system/metrics-server True 12m
v1beta1.networking.k8s.io Local True 46d
v1beta1.node.k8s.io Local True 46d
v1beta1.policy Local True 46d
v1beta1.rbac.authorization.k8s.io Local True 46d
v1beta1.scheduling.k8s.io Local True 46d
v1beta1.storage.k8s.io Local True 46d
v2beta1.autoscaling Local True 46d
v2beta2.autoscaling Local True 46d
三、 HPA 自动伸缩
在生产环境中，总会有一些意想不到的事情发生，比如公司网站流量突然升高，此时之前创建的 Pod 已不足 以撑住所有的访问，而运维人员也不可能 24 小时守着业务服务，这时就可以通过配置 HPA，实现负载过高的情 况下自动扩容 Pod 副本数以分摊高并发的流量，当流量恢复正常后，HPA 会自动缩减 Pod 的数量。HPA 是根据 CPU 的使用率、内存使用率自动扩展 Pod 数量的，所以要使用 HPA 就必须定义 Requests 参数。
1.1、 创建 HPA
# HPA伸缩容 HPA 自动伸缩
kind: Deployment
apiVersion: apps/v1
metadata:
name: nginx-hpa
namespace: default
labels:
app: nginx
spec:
selector:
matchLabels:
app: nginx
test: hpa
template:
metadata:
labels:
app: nginx
test: hpa
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
resources:
limits:
cpu: 10m
memory: 50Mi
requests:
cpu: 10m
memory: 50Mi
---
kind: Service
apiVersion: v1
metadata:
namespace: default
name: hpa-svc
spec:
selector:
app: nginx
test: hpa
ports:
- port: 80
targetPort: 80
---
kind: HorizontalPodAutoscaler
apiVersion: autoscaling/v2beta1
metadata:
name: docs
namespace: default
spec:
# HPA的大pod数量和最少pod数量
maxReplicas: 10
minReplicas: 1
# HPA的伸缩对象描述,HPA会动态修改对象的pods数量
scaleTargetRef:
kind: Deployment
name: nginx-hpa
apiVersion: apps/v1
# 监控的指标数组,支持多种类型的指标共存
metrics:
- type: Resource
# 核心指标，包含 cpu 和内存两种（被弹性伸缩的 pod 对象中容器的 requests 和 limits 中定义的指标。）
resource:
name: cup
# CPU 阈值
# 计算公式：所有目标 pod 的 metric 的使用率（百分比）的平均值，
# 例如 limit.cpu=1000m，实际使用 500m，则 utilization=50%
# 例如 deployment.replica=3, limit.cpu=1000m，则 pod1 实际使用 cpu=500m, pod2=300m,pod=600m
## 则 averageUtilization=(500/1000+300/1000+600/1000)/3 = (500 + 300 +600)/(3*1000)）
targetAverageUtilization: 5
执行
[root@kubernetes-master-01 ~]# vi hpa-metrics-server.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f hpa-metrics-server.yaml
deployment.apps/nginx-hpa created
service/hpa-svc created
horizontalpodautoscaler.autoscaling/docs created
[root@kubernetes-master-01 ~]# kubectl get pods -l test=hpa
NAME READY STATUS RESTARTS AGE
nginx-hpa-569cc66c-hcc2k 1/1 Running 0 47s
[root@kubernetes-master-01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
hpa-svc ClusterIP 10.96.208.122 <none> 80/TCP 2m15s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 49d
nginx NodePort 10.96.106.13 <none> 80:26755/TCP 40d
对hpa-svc进行加压
wget -O- -q http://10.96.208.122
kubectl run test -it --rm --image=busybox:1.28.3
while true; do wget -O- -q http://10.96.220.95 ; done
1.2、 测试
四、 Nginx Ingress
Ingress 为 Kubernetes 集群中的服务提供了入口，可以提供负载均衡、SSL 终止和基于名称的虚拟主机，在生 产环境中常用的 Ingress 有 Treafik、Nginx、HAProxy、Istio 等。在 Kubernetesv 1.1 版中添加的 Ingress 用于从集群 外部到集群内部 Service 的 HTTP 和 HTTPS 路由，流量从 Internet 到 Ingress 再到 Services 最后到 Pod 上，通常情 况下，Ingress 部署在所有的 Node 节点上。Ingress 可以配置提供服务外部访问的 URL、负载均衡、终止 SSL，并 提供基于域名的虚拟主机。但 Ingress 不会暴露任意端口或协
1.1、 安装 nginx ingress
# 官网地址
https://github.com/kubernetes/ingress-nginx
https://kubernetes.github.io/ingress-nginx/
# 部署地址
https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.44.0/deploy/static/provider/baremetal/deploy.yaml
# ingree-nginx.yaml
apiVersion: v1
kind: Namespace
metadata:
name: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
---
# Source: ingress-nginx/templates/controller-serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
data:
---
# Source: ingress-nginx/templates/clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
name: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- configmaps
- endpoints
- nodes
- pods
- secrets
verbs:
- list
- watch
- apiGroups:
- ''
resources:
- nodes
verbs:
- get
- apiGroups:
- ''
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- events
verbs:
- create
- patch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- networking.k8s.io # k8s 1.14+
resources:
- ingressclasses
verbs:
- get
- list
- watch
---
# Source: ingress-nginx/templates/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
name: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: ingress-nginx
subjects:
- kind: ServiceAccount
name: ingress-nginx
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- namespaces
verbs:
- get
- apiGroups:
- ''
resources:
- configmaps
- pods
- secrets
- endpoints
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- extensions
- networking.k8s.io # k8s 1.14+
resources:
- ingresses/status
verbs:
- update
- apiGroups:
- networking.k8s.io # k8s 1.14+
resources:
- ingressclasses
verbs:
- get
- list
- watch
- apiGroups:
- ''
resources:
- configmaps
resourceNames:
- ingress-controller-leader-nginx
verbs:
- get
- update
- apiGroups:
- ''
resources:
- configmaps
verbs:
- create
- apiGroups:
- ''
resources:
- events
verbs:
- create
- patch
---
# Source: ingress-nginx/templates/controller-rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx
namespace: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: ingress-nginx
subjects:
- kind: ServiceAccount
name: ingress-nginx
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/controller-service-webhook.yaml
apiVersion: v1
kind: Service
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller-admission
namespace: ingress-nginx
spec:
type: ClusterIP
ports:
- name: https-webhook
port: 443
targetPort: webhook
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-service.yaml
apiVersion: v1
kind: Service
metadata:
annotations:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
spec:
type: NodePort
ports:
- name: http
port: 80
protocol: TCP
targetPort: http
- name: https
port: 443
protocol: TCP
targetPort: https
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
---
# Source: ingress-nginx/templates/controller-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
spec:
selector:
matchLabels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
revisionHistoryLimit: 10
minReadySeconds: 0
template:
metadata:
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
spec:
dnsPolicy: ClusterFirst
containers:
- name: controller
image: k8s.gcr.io/ingress-nginx/controller:v0.44.0@sha256:3dd0fac48073beaca2d67a78c746c7593f9c575168a17139a9955a82c63c4b9a
imagePullPolicy: IfNotPresent
lifecycle:
preStop:
exec:
command:
- /wait-shutdown
args:
- /nginx-ingress-controller
- --election-id=ingress-controller-leader
- --ingress-class=nginx
- --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
- --validating-webhook=:8443
- --validating-webhook-certificate=/usr/local/certificates/cert
- --validating-webhook-key=/usr/local/certificates/key
securityContext:
capabilities:
drop:
- ALL
add:
- NET_BIND_SERVICE
runAsUser: 101
allowPrivilegeEscalation: true
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: LD_PRELOAD
value: /usr/local/lib/libmimalloc.so
livenessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 1
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 1
successThreshold: 1
failureThreshold: 3
ports:
- name: http
containerPort: 80
protocol: TCP
- name: https
containerPort: 443
protocol: TCP
- name: webhook
containerPort: 8443
protocol: TCP
volumeMounts:
- name: webhook-cert
mountPath: /usr/local/certificates/
readOnly: true
resources:
requests:
cpu: 100m
memory: 90Mi
nodeSelector:
kubernetes.io/os: linux
serviceAccountName: ingress-nginx
terminationGracePeriodSeconds: 300
volumes:
- name: webhook-cert
secret:
secretName: ingress-nginx-admission
---
# Source: ingress-nginx/templates/admission-webhooks/validating-webhook.yaml
# before changing this value, check the required kubernetes version
# https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#prerequisites
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingWebhookConfiguration
metadata:
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
name: ingress-nginx-admission
webhooks:
- name: validate.nginx.ingress.kubernetes.io
matchPolicy: Equivalent
rules:
- apiGroups:
- networking.k8s.io
apiVersions:
- v1beta1
operations:
- CREATE
- UPDATE
resources:
- ingresses
failurePolicy: Fail
sideEffects: None
admissionReviewVersions:
- v1
- v1beta1
clientConfig:
service:
namespace: ingress-nginx
name: ingress-nginx-controller-admission
path: /networking/v1beta1/ingresses
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrole.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
rules:
- apiGroups:
- admissionregistration.k8s.io
resources:
- validatingwebhookconfigurations
verbs:
- get
- update
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
name: ingress-nginx-admission
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
rules:
- apiGroups:
- ''
resources:
- secrets
verbs:
- get
- create
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: ingress-nginx-admission
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
name: ingress-nginx-admission
namespace: ingress-nginx
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-createSecret.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: ingress-nginx-admission-create
annotations:
helm.sh/hook: pre-install,pre-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
spec:
template:
metadata:
name: ingress-nginx-admission-create
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
spec:
containers:
- name: create
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
args:
- create
- --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc
- --namespace=$(POD_NAMESPACE)
- --secret-name=ingress-nginx-admission
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
restartPolicy: OnFailure
serviceAccountName: ingress-nginx-admission
securityContext:
runAsNonRoot: true
runAsUser: 2000
---
# Source: ingress-nginx/templates/admission-webhooks/job-patch/job-patchWebhook.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: ingress-nginx-admission-patch
annotations:
helm.sh/hook: post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
namespace: ingress-nginx
spec:
template:
metadata:
name: ingress-nginx-admission-patch
labels:
helm.sh/chart: ingress-nginx-3.23.0
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.44.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: admission-webhook
spec:
containers:
- name: patch
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
args:
- patch
- --webhook-name=ingress-nginx-admission
- --namespace=$(POD_NAMESPACE)
- --patch-mutating=false
- --secret-name=ingress-nginx-admission
- --patch-failure-policy=Fail
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
restartPolicy: OnFailure
serviceAccountName: ingress-nginx-admission
securityContext:
runAsNonRoot: true
runAsUser: 2000
# 查看依赖镜像
[root@kubernetes-master-01 ~]# cat ingress-nginxdeploy.yaml | grep image
image: k8s.gcr.io/ingress-nginx/controller:v0.44.0@sha256:3dd0fac48073beaca2d67a78c746c7593f9c575168a17139a9955a82c63c4b9a
imagePullPolicy: IfNotPresent
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
image: docker.io/jettech/kube-webhook-certgen:v1.5.1
imagePullPolicy: IfNotPresent
# 仓库构建
https://code.aliyun.com/RandySun121/k8s/blob/master/ingress-controller/Dockerfile
https://cr.console.aliyun.com/repository/cn-hangzhou/k8s121/ingress-nginx/build
# 创建
[root@kubernetes-master-01 ~]# kubectl apply -f ingress-nginxdeploy.yaml
namespace/ingress-nginx created
serviceaccount/ingress-nginx created
configmap/ingress-nginx-controller created
clusterrole.rbac.authorization.k8s.io/ingress-nginx created
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx created
role.rbac.authorization.k8s.io/ingress-nginx created
rolebinding.rbac.authorization.k8s.io/ingress-nginx created
service/ingress-nginx-controller-admission created
service/ingress-nginx-controller created
deployment.apps/ingress-nginx-controller created
validatingwebhookconfiguration.admissionregistration.k8s.io/ingress-nginx-admission created
serviceaccount/ingress-nginx-admission created
clusterrole.rbac.authorization.k8s.io/ingress-nginx-admission created
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx-admission created
role.rbac.authorization.k8s.io/ingress-nginx-admission created
rolebinding.rbac.authorization.k8s.io/ingress-nginx-admission created
job.batch/ingress-nginx-admission-create created
job.batch/ingress-nginx-admission-patch created
# 检查安装是否成功
[root@kubernetes-master-01 ~]# kubectl get pods -n ingress-nginx
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-b449r 0/1 Completed 0 3m34s
ingress-nginx-admission-patch-mqbcr 0/1 Completed 0 3m34s
ingress-nginx-controller-88996f96c-zmql5 1/1 Running 0 3m35s
测试
[root@kubernetes-master-01 ~]# kubectl explain Ingress
KIND: Ingress
VERSION: extensions/v1beta1
kind: Ingress
# kubectl explain Ingress
apiVersion: extensions/v1beta1
metadata:
namespace: default
name: test-ingress
spec:
rules:
- host: www.test.com
http:
paths:
- backend:
serviceName: hpa-svc
servicePort: 80
path: /
[root@kubernetes-master-01 ~]# vi test-ingress.yaml
# 部署
[root@kubernetes-master-01 ~]# kubectl apply -f test-ingress.yaml
ingress.extensions/test-ingress created
# 查看部署结果
[root@kubernetes-master-01 ~]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
test-ingress <none> www.randysun.com 80 9s
[root@kubernetes-master-01 ~]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
test-ingress <none> www.randysun.com 80 32s
[root@kubernetes-master-01 ~]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
test-ingress <none> www.randysun.com 172.16.0.52 80 89s
# 查看访问ip
[root@kubernetes-master-01 ~]# kubectl get svc -n ingress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.96.175.228 <none> 80:4915/TCP,443:20134/TCP 81m
ingress-nginx-controller-admission ClusterIP 10.96.86.189 <none> 443/TCP 81m
1.2、 基于 TLS 的 Ingress
1.2.1、创建证书
创建证书，生产环境的证书为公司购买的证书。
openssl genrsa -out tls.key 2048
openssl req -new -x509 -key tls.key -out tls.crt -subj -C=CN/ST=ShangHai/L=ShangHai/O=Ingress/CN=www.test.com
[root@kubernetes-master-01 ~]# mkdir cert
[root@kubernetes-master-01 ~]# cd cert/
[root@kubernetes-master-01 cert]# openssl genrsa -out tls.key 2048
Generating RSA private key, 2048 bit long modulus
.....................................+++
...+++
e is 65537 (0x10001)
[root@kubernetes-master-01 cert]# ls
tls.key
[root@kubernetes-master-01 cert]# openssl req -new -x509 -key tls.key -out tls.crt -subj /C=CN/ST=ShangHai/L=ShangHai/O=Ingress/CN=www.test.com
[root@kubernetes-master-01 cert]# ll
total 8
-rw-r--r--. 1 root root 1289 Mar 21 14:26 tls.crt
-rw-r--r--. 1 root root 1679 Mar 21 14:26 tls.key
[root@kubernetes-master-01 cert]# kubectl -n default create secret tls ingress-tls --cert=tls.crt --key=tls.key
secret/ingress-tls created
[root@kubernetes-master-01 cert]# kubectl get secrets
NAME TYPE DATA AGE
default-token-xt6cs kubernetes.io/service-account-token 3 44d
ingress-tls kubernetes.io/tls 2 28s
1.2.2、定义 Ingress
---
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: ingress-ingress
namespace: default
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
tls:
- secretName: ingress-tls # 通过 kubectl get secrets 命令查看名字
rules:
- host: www.test.com
http:
paths:
- backend:
serviceName: hpa-svc
servicePort: 80
1.2.2.1、 部署
[root@kubernetes-master-01 ~]# kubectl apply -f ingress-nginx-tls.yaml
ingress.extensions/ingress-ingress created
[root@kubernetes-master-01 ~]# kubectl get svc -n ingress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx-controller NodePort 10.96.175.228 <none> 80:4915/TCP,443:20134/TCP 147m
ingress-nginx-controller-admission ClusterIP 10.96.86.189 <none> 443/TCP 147m
[root@kubernetes-master-01 ~]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress-ingress <none> www.test.com 172.16.0.52 80, 443 45s
五、 数据持久化
我们知道，Pod 是由容器组成的，而容器宕机或停止之后，数据就随之丢了，那么这也就意味着我们在做 Kubernetes 集群的时候就不得不考虑存储的问题，而存储卷就是为了 Pod 保存数据而生的。存储卷的类型有很多， 我们常用到一般有四种：emptyDir，hostPath，NFS 以及云存储（ceph, glasterfs...）等。
1、 emptyDir
emptyDir 类型的 volume 在 pod 分配到 node 上时被创建，kubernetes 会在 node 上自动分配 一个目录，因 此无需指定宿主机 node 上对应的目录文件。这个目录的初始内容为空，当 Pod 从 node 上移除时，emptyDir 中 的数据会被永久删除。emptyDir Volume 主要用于某些应用程序无需永久保存的临时目录。
kind: Deployment 数据持久化 emptyDir 类型的 volume 在 pod 分配到 node 上时被创建，kubernetes 会在 node 上自动分配 一个目录，因 此**无需指定宿主机 node 上对应的目录文件**。这个目录的初始内容为空，当 Pod 从 node 上移除时，emptyDir 中 的数据会被永久删除。emptyDir Volume 主要用于某些应用程序无需永久保存的临时目录。
apiVersion: apps/v1
metadata:
namespace: default
name: empty-dir
spec:
selector:
matchLabels:
app: empty-dir
template:
metadata:
labels:
app: empty-dir
spec:
containers:
# 第一个容器
- name: busybox
image: busybox:1.28.3
imagePullPolicy: IfNotPresent
command: ['/bin/sh', '-c', "while true; do echo 'empty-dir busybox' >> /data/index; sleep 1; done"]
# 挂载存储卷
volumeMounts:
- mountPath: /data # 挂在容器里面的路径
name: empty-dir-data # 存储卷的名称
# 第二个容器
- name: busybox-tow
image: busybox
imagePullPolicy: IfNotPresent
command: ['/bin/sh', '-c', "while true; do echo 'empty-dir busybox-tow' >> /data/index; sleep 1; done"]
# 挂载存储卷
volumeMounts:
- mountPath: /data
name: empty-dir-data
# 定义存储卷
volumes:
- name: empty-dir-data
[root@kubernetes-master-01 ~]# kubectl get pods -l app=empty-dir
NAME READY STATUS RESTARTS AGE
empty-dir-565bf99586-shm9t 0/2 CrashLoopBackOff 8 107s
[root@kubernetes-master-01 ~]# kubectl delete -f empty-dir-data.yaml
deployment.apps "empty-dir" deleted
# 创建Pods
[root@kubernetes-master-01 ~]# vi empty-dir-data.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f empty-dir-data.yaml
deployment.apps/empty-dir created
[root@kubernetes-master-01 ~]# kubectl get pods -l app=empty-dir
NAME READY STATUS RESTARTS AGE
empty-dir-796cf6fc58-h2rpf 2/2 Running 0 4s
# 不同的容器操作同一个容器
[root@kubernetes-master-01 ~]# kubectl exec -it empty-dir-796cf6fc58-h2rpf -c busybox -- sh
/ # tail -f /data/index
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
empty-dir busybox
empty-dir busybox-tow
^C
2、 hostPath
hostPath 类型则是映射 node 文件系统中的文件或者目录到 pod 里。在使用 hostPath 类型的存储卷时，也可 以设置 type 字段，支持的类型有文件、目录、File、Socket、CharDevice 和 BlockD
kubectl explain pod.spec.volumes.hostPath.type
https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
kind: Deployment
apiVersion: apps/v1
metadata:
name: hostpath
spec:
selector:
matchLabels:
app: hostpath
template:
metadata:
labels:
app: hostpath
spec:
containers:
- name: hostpath
image: nginx:1.19.2
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /usr/share/nginx/html # 挂载目录
name: hostpath
volumes:
- name: hostpath # 宿主机
hostPath:
path: /opt
type: DirectoryOrCreate
[root@kubernetes-master-01 ~]# vim hostpath.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f hostpath.yaml
deployment.apps/hostpath created
[root@kubernetes-master-01 ~]# kubectl get pods -l app=hostpath
NAME READY STATUS RESTARTS AGE
hostpath-79f9457bc6-vcb6f 1/1 Running 0 13s
[root@kubernetes-master-01 ~]# kubectl get pods -l app=hostpaht -o wide
No resources found in default namespace.
[root@kubernetes-master-01 ~]# kubectl get pods -l app=hostpath -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
hostpath-79f9457bc6-vcb6f 1/1 Running 0 77s 10.241.136.3 kubernetes-master-01 <none> <none>
[root@kubernetes-master-01 ~]# curl 10.241.136.3
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx/1.19.2</center>
</body>
</html>
[root@kubernetes-master-01 ~]# cd /opt/
[root@kubernetes-master-01 opt]# echo "String" >> index.html
[root@kubernetes-master-01 opt]# curl 10.241.136.3
String
[root@kubernetes-master-01 opt]# pwd
/opt
[root@kubernetes-master-01 opt]#
3、 PV 和 PVC
PersistentVolume（PV）是集群中已由管理员配置的一段网络存储。 集群中的资源就像一个节点是一个集群资源。 PV 是诸如卷之类的卷插件，但是具有独立于使用 PV 的任何单个 pod 的生命周期。 该 API 对象捕获存储 的实现细节，即 NFS，iSCSI 或云提供商特定的存储系统
PersistentVolumeClaim（PVC）是用户存储的请求。PVC 的使用逻辑：在 pod 中定义一个存储卷（该存储卷类 型为 PVC），定义的时候直接指定大小，pvc 必须与对应的 pv 建立关系，pvc 会根据定义去 pv 申请，而 pv 是由 存储空间创建出来的。pv 和 pvc 是 kubernetes 抽象出来的一种存储资源
3.1、 Nfs
nfs 使得我们可以挂载已经存在的共享到我们的 Pod 中，和 emptyDir 不同的是，当 Pod 被删除时，emptyDir 也会被删除。但是 nfs 不会被删除，仅仅是解除挂在状态而已，这就意味着 NFS 能够允许我们提前对数据进行处 理，而且这些数据可以在 Pod 之间相互传递，并且 nfs 可以同时被多个 pod 挂在并进行读写。
3.1.1、再所有节点上安装 nfs
# 每个节点都要安装
yum install nfs-utils.x86_64 -y
3.1.2、配置 nfs
# 只需要在master节点中配置,注意ip的网段
[root@kubernetes-master-01 ~]# mkdir -p /nfs/v{1..5}
[root@kubernetes-master-01 ~]# ls /nfs/
v1 v2 v3 v4 v5
[root@kubernetes-master-01 ~]# ls /nfs/v
v1/ v2/ v3/ v4/ v5/
[root@kubernetes-master-01 ~]# ls /nfs/v1/
[root@kubernetes-master-01 ~]# chmod -R 777 /nfs/
[root@kubernetes-master-01 ~]# cat /etc/exports
# 网段一定要在当前主机范围内
[root@kubernetes-master-01 ~]# cat > /etc/exports <<EOF
> /nfs/v1 172.16.0.0/16(rw,no_root_squash)
> /nfs/v2 172.16.0.0/16(rw,no_root_squash)
> /nfs/v3 172.16.0.0/16(rw,no_root_squash)
> /nfs/v4 172.16.0.0/16(rw,no_root_squash)
> /nfs/v5 172.16.0.0/16(rw,no_root_squash)
> EOF
[root@kubernetes-master-01 ~]# systemctl start nfs.service
[root@kubernetes-master-01 ~]# showmount -e
Export list for kubernetes-master-01:
/nfs/v5 172.16.0.0/16
/nfs/v4 172.16.0.0/16
/nfs/v3 172.16.0.0/16
/nfs/v2 172.16.0.0/16
/nfs/v1 172.16.0.0/16
[root@kubernetes-master-01 ~]# systemctl status nfs.service
● nfs-server.service - NFS server and services
Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled; vendor preset: disabled)
Active: active (exited) since Sun 2021-03-21 16:19:34 CST; 48s ago
Process: 44751 ExecStartPost=/bin/sh -c if systemctl -q is-active gssproxy; then systemctl reload gssproxy ; fi (code=exited, status=0/SUCCESS)
Process: 44735 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
Process: 44732 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
Main PID: 44735 (code=exited, status=0/SUCCESS)
Tasks: 0
Memory: 0B
CGroup: /system.slice/nfs-server.service
Mar 21 16:19:34 kubernetes-master-01 systemd[1]: Starting NFS server and services...
Mar 21 16:19:34 kubernetes-master-01 systemd[1]: Started NFS server and services.
3.1.3、创建 POD 使用 Nfs
kind: Deployment
apiVersion: apps/v1
metadata:
name: nfs-server
spec:
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /usr/share/nginx/html
name: nfs
volumes:
- name: nfs
nfs:
path: /nfs/v1
server: 172.16.0.50
执行
kubectl apply -f nfs-server.yaml
[root@kubernetes-master-01 ~]# kubectl get pods -l app=nginx
NAME READY STATUS RESTARTS AGE
nfs-server-794bc894b8-dhb5x 1/1 Running 0 34s
[root@kubernetes-master-01 ~]# kubectl get pods -o wide -w
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nfs-server-794bc894b8-dhb5x 1/1 Running 0 3m 10.241.168.3 kubernetes-node-01 <none> <none>
# 访问nginx
[root@kubernetes-master-01 ~]# curl 10.241.168.3
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx/1.19.6</center>
</body>
</html>
[root@kubernetes-master-01 ~]# cd /nfs/v1/
[root@kubernetes-master-01 v1]# ls
[root@kubernetes-master-01 v1]# echo "Nfs" > index.html
[root@kubernetes-master-01 v1]# curl 10.241.168.3
Nfs
3.2、 PV 的访问模式（accessModes）
| 模式 | 解释 |
|---|---|
| ReadWriteOnce（RWO） | 可读可写，但只支持被单个节点挂载。 |
| ReadOnlyMany（ROX） | 只读，可以被多个节点挂载。 |
| ReadWriteMany（RWX） | 多路可读可写。这种存储可以以读写的方式被多个节点共享。不是每一种存储都支 持这三种方式，像共享方式，目前支持的还比较少，比较常用的是 NFS。在 PVC 绑 定 PV 时通常根据两个条件来绑定，一个是存储的大小，另一个就是访问模式。 |
3.3、 PV 的回收策略（persistentVolumeReclaimPolicy）
| 策略 | 解释 |
|---|---|
| Retain | 不清理, 保留 Volume（需要手动清理 |
| Recycle | 删除数据，即 rm -rf /thevolume/*（只有 NFS 和 HostPath 支持 |
| Delete | 删除存储资源，比如删除 AWS EBS 卷（只有 AWS EBS, GCE PD, Azure Disk 和 |
3.4、 PV 的状态
| 状态 | 解释 |
|---|---|
| Available | 可用 |
| Bound | 已经分配给 PVC |
| Released | PVC 解绑但还未执行回收策略。 |
| Failed | 发生错误。 |
3.5、 创建 PV
# 创建pv资源(相当于创建磁盘)
kind: PersistentVolume
apiVersion: v1
metadata:
name: pv001
labels:
app: pv001
spec:
nfs:
path: /nfs/v2
server: 172.16.0.50
accessModes: # 访问模式
- "ReadWriteMany" # 多路可读可写
- "ReadWriteOnce" # 单个节点可读可写
capacity:
storage: 2Gi
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: pv002
labels:
app: pv002
spec:
nfs:
path: /nfs/v3
server: 172.16.0.50
accessModes:
- "ReadWriteMany"
- "ReadWriteOnce"
capacity:
storage: 5Gi
persistentVolumeReclaimPolicy: Delete # pv回收策略
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: pv003
labels:
app: pv003
spec:
nfs:
path: /nfs/v4
server: 172.16.0.50
accessModes:
- "ReadWriteMany"
- "ReadWriteOnce"
capacity:
storage: 10Gi
persistentVolumeReclaimPolicy: Recycle # pv回收策略
---
kind: PersistentVolume
apiVersion: v1
metadata:
name: pv004
labels:
app: pv004
spec:
nfs:
path: /nfs/v5
server: 172.16.0.50
accessModes:
- "ReadWriteMany"
- "ReadWriteOnce"
capacity:
storage: 20Gi
persistentVolumeReclaimPolicy: Retain # pv回收策略
执行
[root@kubernetes-master-01 ~]# kubectl apply -f pv.yaml
persistentvolume/pv001 created
persistentvolume/pv002 created
persistentvolume/pv003 created
persistentvolume/pv004 created
[root@kubernetes-master-01 ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 2Gi RWO,RWX Retain Available 30s
pv002 5Gi RWO,RWX Delete Available 30s
pv003 10Gi RWO,RWX Recycle Available 30s
pv004 20Gi RWO,RWX Retain Available 30s
3.5.1、查看 pv
[root@kubernetes-master-01 ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 2Gi RWO,RWX Retain Available 30s
pv002 5Gi RWO,RWX Delete Available 30s
pv003 10Gi RWO,RWX Recycle Available 30s
pv004 20Gi RWO,RWX Retain Available 30s
3.6、 使用 pv，创建pvc
# 创建Pvc使用pv
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: pvc # claimName的名字要保持一致
namespace: default
spec:
accessModes:
- "ReadWriteMany"
resources:
requests:
storage: "6Gi" # 最少资源六个G,会选择最贴近的pv
---
kind: Deployment
apiVersion: apps/v1
metadata:
name: nfs-pv-pvc
namespace: default
spec:
selector:
matchLabels:
app: nfs
template:
metadata:
labels:
app: nfs
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /usr/share/nginx/html/
name: html
volumes:
- name: html
persistentVolumeClaim:
claimName: pvc
replicas: 2
执行
[root@kubernetes-master-01 ~]# kubectl apply -f pvc.yaml
persistentvolumeclaim/pvc unchanged
deployment.apps/nfs-pv-pvc created
3.7、 查看 pvc
[root@kubernetes-master-01 ~]# kubectl apply -f pvc.yaml
persistentvolumeclaim/pvc created
deployment.apps/nfs-pv-pvc created
[root@kubernetes-master-01 ~]# kubectl get pv,pvc
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
persistentvolume/pv001 2Gi RWO,RWX Retain Available 48s
persistentvolume/pv002 5Gi RWO,RWX Delete Available 48s
persistentvolume/pv003 10Gi RWO,RWX Recycle Bound default/pvc 48s
persistentvolume/pv004 20Gi RWO,RWX Retain Available 47s
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/pvc Bound pv003 10Gi RWO,RWX 26s
# 查看详细信息
[root@kubernetes-master-01 ~]# kubectl describe pv pv003
Name: pv003
Labels: app=pv003
Annotations: pv.kubernetes.io/bound-by-controller: yes
Finalizers: [kubernetes.io/pv-protection]
StorageClass:
Status: Bound
Claim: default/pvc
Reclaim Policy: Recycle
Access Modes: RWO,RWX
VolumeMode: Filesystem
Capacity: 10Gi
Node Affinity: <none>
Message:
Source:
Type: NFS (an NFS mount that lasts the lifetime of a pod)
Server: 170.16.0.50
Path: /nfs/v4
ReadOnly: false
Events: <none>
# 查看详细信息
[root@kubernetes-master-01 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
empty-dir-796cf6fc58-h2rpf 2/2 Running 0 172m 10.241.24.3 kubernetes-node-02 <none> <none>
hostpath-79f9457bc6-vcb6f 1/1 Running 0 146m 10.241.136.3 kubernetes-master-01 <none> <none>
nfs-pv-pvc-67f9f546f7-897d4 1/1 Running 0 66s 10.241.168.3 kubernetes-node-01 <none> <none>
nfs-pv-pvc-67f9f546f7-8ngw6 1/1 Running 0 66s 10.241.136.4 kubernetes-master-01 <none> <none>
nginx-569cc66c-7mnwc 1/1 Running 0 8h 10.241.24.2 kubernetes-node-02 <none> <none>
nginx-hpa-fb47f9ccb-zj2hg 1/1 Running 0 7h40m 10.240.56.2 kubernetes-master-03 <none> <none>
nginx-pod 1/1 Running 7 14d 10.242.168.2 kubernetes-master02 <none> <none>
recycler-for-pv003 0/1 ContainerCreating 0 2m47s <none> kubernetes-master-03 <none> <none>
test 1/1 Running 0 6h49m 10.241.136.2 kubernetes-master-01 <none> <none>
# 访问pods
[root@kubernetes-master-01 ~]# curl 10.241.168.3
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx/1.19.6</center>
</body>
</html>
[root@kubernetes-master-01 v4]# echo "pv-pvc" > index.html
[root@kubernetes-master-01 v4]# curl 10.241.168.3
pv-pvc
4、 StorageClass
在一个大规模的Kubernetes集群里,可能有成千上万个 PVC,这就意味着运维人员必须实现创建出这个多个PV, 此外,随着项目的需要,会有新的 PVC 不断被提交,那么运维人员就需要不断的添加新的,满足要求的 PV,否则新的 Pod 就会因为 PVC 绑定不到 PV 而导致创建失败。而且通过 PVC 请求到一定的存储空间也很有可能不足以满足应 用对于存储设备的各种需求，而且不同的应用程序对于存储性能的要求可能也不尽相同，比如读写速度、并发性 能等，为了解决这一问题，Kubernetes 又为我们引入了一个新的资源对象：StorageClass，通过 StorageClass 的 定义，管理员可以将存储资源定义为某种类型的资源，比如快速存储、慢速存储等，kubernetes 根据 StorageClass 的描述就可以非常直观的知道各种存储资源的具体特性了，这样就可以根据应用的特性去申请合适的存储资源 了。
4.1、 定义 StorageClass
每一个存储类都包含 provisioner、parameters 和 reclaimPolicy 这三个参数域，当一个属于某个类的 PersistentVolume 需要被动态提供时，将会使用上述的参数域。
# 自动创建pv和pvc
# 下载 helm
https://github.com/helm/helm/releases/tag/v3.5.3 #
wget https://get.helm.sh/helm-v3.3.4-linux-amd64.tar.gz
# 解压
tar xf helm-v3.3.4-linux-amd64.tar.gz
# 安装
mv linux-amd64/helm /usr/local/bin/
# 验证
helm version
# 添加阿里云镜像仓库
helm repo add ali-stable https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
# 添加官方仓库
helm repo add stable https://kubernetes-charts.storage.googleapis.com/
# 添加微软云 helm 仓库
helm repo add azure http://mirror.azure.cn/kubernetes/charts
[root@kubernetes-master-01 linux-amd64]# helm repo list
NAME URL
ali-stable https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
azure http://mirror.azure.cn/kubernetes/charts
安装nfs客户端
# 下载 nfs 客户端
helm pull azure/nfs-client-provisioner
tar xf nfs-client-provisioner-1.2.11.tgz
cd nfs-client-provisioner/
# 修改相关配置
vim values.yaml
# 安装 nfs client
[root@kubernetes-master-01 nfs-client-provisioner]# pwd
/root/nfs-client-provisioner
[root@kubernetes-master-01 nfs-client-provisioner]# helm install hfs-client ./
WARNING: This chart is deprecated
NAME: hfs-client
LAST DEPLOYED: Sun Mar 21 21:49:13 2021
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
# 查看安装客户端
[root@kubernetes-master-01 nfs-client-provisioner]# helm list
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
hfs-client default 1 2021-03-21 21:49:13.26492902 +0800 CST deployed nfs-client-provisioner-1.2.11 3.1.0
失败
自动创建pv和pvc
# 自动创建pv和pvc
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
namespace: default
name: test-nfs
labels:
app: test-nfs
spec:
accessModes:
- ReadWriteMany
storageClassName: nfs-client # 要与nfs安装的客户端名字一致
resources:
requests:
storage: 8Gi
---
kind: Deployment
apiVersion: apps/v1
metadata:
name: test-nfs-storageclass
namespace: default
labels:
app: test-nfs
spec:
selector:
matchLabels:
app: test-nfs
template:
metadata:
labels:
app: test-nfs
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /usr/share/nginx/html
name: test-nfs
volumes:
- name: test-nfs
persistentVolumeClaim:
claimName: test-nfs
六、 K8S 配置中心
在生产环境中经常会遇到需要修改配置文件的情况，传统的修改方式不仅会影响到服务的正常运行，而且操 作步骤也很繁琐。为了解决这个问题，kubernetes 项目从 1.2 版本引入了 ConfigMap 功能，用于将应用的配置信 息与程序的分离。这种方式不仅可以实现应用程序被的复用，而且还可以通过不同的配置实现更灵活的功能。在 创建容器时，用户可以将应用程序打包为容器镜像后，通过环境变量或者外接挂载文件的方式进行配置注入。 ConfigMap && Secret 是 K8S 中的针对应用的配置中心，它有效的解决了应用挂载的问题，并且支持加密以及热 更新等功能，可以说是一个 k8s 提供的一件非常好用的功能。
1、 创建 configmap
将配置信息直接写入到ETCD中直接读取配置信息
1.1、 指定配置文件
kubectl create configmap 配置文件名字 --from-file=*.yaml文件
# 创建configmap配置文件
[root@kubernetes-master-01 ~]# kubectl create configmap test-configmap --from-file=sc-nfs.yaml
configmap/test-configmap created
# 获取配置文件
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
test-configmap 1 12s
# 查看配置文件信息
[root@kubernetes-master-01 ~]# kubectl describe configmaps test-configmap
Name: test-configmap
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
sc-nfs.yaml:
----
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
namespace: default
name: test-nfs
labels:
app: test-nfs
spec:
accessModes:
- ReadWriteMany
storageClassName: nfs-client # 要与nfs安装的客户端名字一致
resources:
requests:
storage: 8Gi
---
kind: Deployment
apiVersion: apps/v1
metadata:
name: test-nfs-storageclass
namespace: default
labels:
app: test-nfs
spec:
selector:
matchLabels:
app: test-nfs
template:
metadata:
labels:
app: test-nfs
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: /usr/share/nginx/html
name: test-nfs
volumes:
- name: test-nfs
persistentVolumeClaim:
claimName: test-nfs
Events: <none>
1.2、 指定配置目录
# 指定文件夹
[root@kubernetes-master-01 ~]# cd nfs-client-provisioner/
[root@kubernetes-master-01 nfs-client-provisioner]# ll
total 20
-rw-r--r--. 1 root root 456 Nov 14 04:30 Chart.yaml
drwxr-xr-x. 2 root root 30 Mar 21 20:02 ci
-rw-r--r--. 1 root root 6248 Nov 14 04:30 README.md
drwxr-xr-x. 2 root root 4096 Mar 21 20:02 templates
-rw-r--r--. 1 root root 1878 Mar 21 21:41 values.yaml
[root@kubernetes-master-01 nfs-client-provisioner]# cat Chart.yaml
apiVersion: v1
appVersion: 3.1.0
deprecated: true
description: DEPRECATED - nfs-client is an automatic provisioner that used your *already
configured* NFS server, automatically creating Persistent Volumes.
home: https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client
keywords:
- nfs
- storage
name: nfs-client-provisioner
sources:
- https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client
version: 1.2.11
[root@kubernetes-master-01 nfs-client-provisioner]#
[root@kubernetes-master-01 nfs-client-provisioner]#
[root@kubernetes-master-01 nfs-client-provisioner]# cd ..
[root@kubernetes-master-01 ~]# kubectl create configmap nfs --from-file=nfs-client-provisioner
configmap/nfs created
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
nfs 4 14s
test-configmap 1 10m
[root@kubernetes-master-01 ~]# kubectl describe configmaps nfs
Name: nfs
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
.helmignore:
----
# Patterns to ignore when building packages.
# This supports shell glob matching, relative path matching, and
# negation (prefixed with !). Only one pattern per line.
.DS_Store
# Common VCS dirs
.git/
.gitignore
.bzr/
.bzrignore
.hg/
.hgignore
.svn/
# Common backup files
*.swp
*.bak
*.tmp
*~
# Various IDEs
.project
.idea/
*.tmproj
Chart.yaml:
----
apiVersion: v1
appVersion: 3.1.0
deprecated: true
description: DEPRECATED - nfs-client is an automatic provisioner that used your *already
configured* NFS server, automatically creating Persistent Volumes.
home: https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client
keywords:
- nfs
- storage
name: nfs-client-provisioner
sources:
- https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client
version: 1.2.11
README.md:
----
# ⚠️ Repo Archive Notice
As of Nov 13, 2020, charts in this repo will no longer be updated.
For more information, see the Helm Charts [Deprecation and Archive Notice](https://github.com/helm/charts#%EF%B8%8F-deprecation-and-archive-notice), and [Update](https://helm.sh/blog/charts-repo-deprecation/).
# nfs-client-provisioner
The [NFS client provisioner](https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client) is an automatic provisioner for Kubernetes that uses your *already configured* NFS server, automatically creating Persistent Volumes.
## DEPRECATION NOTICE
This chart is deprecated and no longer supported.
## TL;DR;
```console
$ helm install --set nfs.server=x.x.x.x --set nfs.path=/exported/path stable/nfs-client-provisioner
```
For **arm** deployments set `image.repository` to `--set image.repository=quay.io/external_storage/nfs-client-provisioner-arm`
## Introduction
This charts installs custom [storage class](https://kubernetes.io/docs/concepts/storage/storage-classes/) into a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager. It also installs a [NFS client provisioner](https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client) into the cluster which dynamically creates persistent volumes from single NFS share.
## Prerequisites
- Kubernetes 1.9+
- Existing NFS Share
## Installing the Chart
To install the chart with the release name `my-release`:
```console
$ helm install --name my-release --set nfs.server=x.x.x.x --set nfs.path=/exported/path stable/nfs-client-provisioner
```
The command deploys the given storage class in the default configuration. It can be used afterswards to provision persistent volumes. The [configuration](#configuration) section lists the parameters that can be configured during installation.
> **Tip**: List all releases using `helm list`
## Uninstalling the Chart
To uninstall/delete the `my-release` deployment:
```console
$ helm delete my-release
```
The command removes all the Kubernetes components associated with the chart and deletes the release.
## Configuration
The following tables lists the configurable parameters of this chart and their default values.
| Parameter | Description | Default |
| ----------------------------------- | ----------------------------------------------------------- | ------------------------------------------------- |
| `replicaCount` | Number of provisioner instances to deployed | `1` |
| `strategyType` | Specifies the strategy used to replace old Pods by new ones | `Recreate` |
| `image.repository` | Provisioner image | `quay.io/external_storage/nfs-client-provisioner` |
| `image.tag` | Version of provisioner image | `v3.1.0-k8s1.11` |
| `image.pullPolicy` | Image pull policy | `IfNotPresent` |
| `storageClass.name` | Name of the storageClass | `nfs-client` |
| `storageClass.defaultClass` | Set as the default StorageClass | `false` |
| `storageClass.allowVolumeExpansion` | Allow expanding the volume | `true` |
| `storageClass.reclaimPolicy` | Method used to reclaim an obsoleted volume | `Delete` |
| `storageClass.provisionerName` | Name of the provisionerName | null |
| `storageClass.archiveOnDelete` | Archive pvc when deleting | `true` |
| `storageClass.accessModes` | Set access mode for PV | `ReadWriteOnce` |
| `nfs.server` | Hostname of the NFS server | null (ip or hostname) |
| `nfs.path` | Basepath of the mount point to be used | `/ifs/kubernetes` |
| `nfs.mountOptions` | Mount options (e.g. 'nfsvers=3') | null |
| `resources` | Resources required (e.g. CPU, memory) | `{}` |
| `rbac.create` | Use Role-based Access Control | `true` |
| `podSecurityPolicy.enabled` | Create & use Pod Security Policy resources | `false` |
| `priorityClassName` | Set pod priorityClassName | null |
| `serviceAccount.create` | Should we create a ServiceAccount | `true` |
| `serviceAccount.name` | Name of the ServiceAccount to use | null |
| `nodeSelector` | Node labels for pod assignment | `{}` |
| `affinity` | Affinity settings | `{}` |
| `tolerations` | List of node taints to tolerate | `[]` |
values.yaml:
----
# Default values for nfs-client-provisioner.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.
replicaCount: 1
strategyType: Recreate
image:
repository: quay.io/external_storage/nfs-client-provisioner
tag: v3.1.0-k8s1.11
pullPolicy: IfNotPresent
nfs:
server: 172.16.0.50 # 修改为nfs的ip地址
path: /nfs/v5 # 修改自己创建的路径
mountOptions:
# For creating the StorageClass automatically:
storageClass:
create: true
# Set a provisioner name. If unset, a name will be generated.
# provisionerName:
# Set StorageClass as the default StorageClass
# Ignored if storageClass.create is false
defaultClass: false
# Set a StorageClass name
# Ignored if storageClass.create is false
name: nfs-client
# Allow volume to be expanded dynamically
allowVolumeExpansion: true
# Method used to reclaim an obsoleted volume
reclaimPolicy: Delete # 回收策略
# When set to false your PVs will not be archived by the provisioner upon deletion of the PVC.
archiveOnDelete: true
# Set access mode - ReadWriteOnce, ReadOnlyMany or ReadWriteMany
accessModes: ReadWriteMany # 修改多路可读可写
## For RBAC support:
rbac:
# Specifies whether RBAC resources should be created
create: true
# If true, create & use Pod Security Policy resources
# https://kubernetes.io/docs/concepts/policy/pod-security-policy/
podSecurityPolicy:
enabled: false
## Set pod priorityClassName
# priorityClassName: ""
serviceAccount:
# Specifies whether a ServiceAccount should be created
create: true
# The name of the ServiceAccount to use.
# If not set and create is true, a name is generated using the fullname template
name:
resources: {}
# limits:
# cpu: 100m
# memory: 128Mi
# requests:
# cpu: 100m
# memory: 128Mi
nodeSelector: {}
tolerations: []
affinity: {}
Events: <none>
1.3、 指定配置项
[root@kubernetes-master-01 ~]# kubectl create configmap calue --from-literal=env=prod --from-literal=language=Python
configmap/calue created
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
calue 2 7s
nfs 4 11m
test-configmap 1 21m
[root@kubernetes-master-01 ~]# kubectl describe configmaps calue
Name: calue
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
env:
----
prod
language:
----
Python
Events: <none>
1.4、 通过配置清单的方式创建 configmap
vim configmap.yaml
kind: ConfigMap
apiVersion: v1
metadata:
name: configmap
data:
# nginx: 123 多行数据用管道符 | 或 |-
nginx: |
upstream tomcatserver1 {
server 192.168.72.49:8081;
}
upstream tomcatserver2 {
server 192.168.72.49:8082;
}
server {
listen 80;
server_name 8081.max.com;
location / {
proxy_pass http://tomcatserver1;
index index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}
# 执行
[root@kubernetes-master-01 ~]# vi configmap.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f co
components-metrics-server.yaml configmap.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f co
components-metrics-server.yaml configmap.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f configmap.yaml
configmap/configmap created
[root@kubernetes-master-01 ~]# kubectl get con
configmaps controllerrevisions.apps
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
calue 2 15m
configmap 1 37s
nfs 4 26m
test-configmap 1 36m
[root@kubernetes-master-01 ~]# kubectl describe configmaps configmap
Name: configmap
Namespace: default
Labels: <none>
Annotations:
Data
====
nginx:
----
upstream tomcatserver1 {
server 192.168.72.49:8081;
}
upstream tomcatserver2 {
server 192.168.72.49:8082;
}
server {
listen 80;
server_name 8081.max.com;
location / {
proxy_pass http://tomcatserver1;
index index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}
Events: <none>
2、 使用 configmap
一般情况下，我们是通过挂载的方式使用 configmap。
# 使用 configmap
kind: Deployment
apiVersion: apps/v1
metadata:
name: configmap-deploymemt
spec:
selector:
matchLabels:
app: configmap-deploymemt
template:
metadata:
labels:
app: configmap-deploymemt
spec:
containers:
- name: nginx
imagePullPolicy: IfNotPresent
image: nginx:latest
volumeMounts: # 挂载
- mountPath: /usr/share/nginx/html
name: nginx
volumes:
- name: nginx
configMap:
name: configmap # 已经创建的configmap并且存在的
items:
- key: nginx
path: nginx
# 查看configmaps
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
calue 2 28m
configmap 1 14m
nfs 4 39m
test-configmap 1 49m
# 创建pods
[root@kubernetes-master-01 ~]# vi configmap-deployment.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f configmap-deployment.yaml
deployment.apps/configmap-deploymemt created
[root@kubernetes-master-01 ~]# kubectl get pods -l app=configmap-deploymemt
NAME READY STATUS RESTARTS AGE
configmap-deploymemt-54b79567c7-9xpk7 1/1 Running 0 21s
# 查看挂载
[root@kubernetes-master-01 ~]# kubectl exec -it configmap-deploymemt-54b79567c7-9xpk7 -- bash
root@configmap-deploymemt-54b79567c7-9xpk7:/# cd /usr/share/nginx/html/
# nginx下面的配置信息被覆盖了
root@configmap-deploymemt-54b79567c7-9xpk7:/usr/share/nginx/html# ls
nginx
root@configmap-deploymemt-54b79567c7-9xpk7:/usr/share/nginx/html# cat nginx
upstream tomcatserver1 {
server 192.168.72.49:8081;
}
upstream tomcatserver2 {
server 192.168.72.49:8082;
}
server {
listen 80;
server_name 8081.max.com;
location / {
proxy_pass http://tomcatserver1;
index index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}
root@configmap-deploymemt-54b79567c7-9xpk7:/usr/share/nginx/html# ls -alh
total 0
drwxrwxrwx. 3 root root 72 Apr 7 15:10 .
drwxr-xr-x. 3 root root 18 Jan 12 10:17 ..
drwxr-xr-x. 2 root root 19 Apr 7 15:10 ..2021_04_07_15_10_12.993253073
lrwxrwxrwx. 1 root root 31 Apr 7 15:10 ..data -> ..2021_04_07_15_10_12.993253073
lrwxrwxrwx. 1 root root 12 Apr 7 15:10 nginx -> ..data/nginx
root@configmap-deploymemt-54b79567c7-9xpk7:/usr/share/nginx/html#
2.1、 subPath
mountPath 结合 subPath(也可解决多个 configmap 挂载同一目录，导致覆盖)作用(不支持热更新)。
# 使用 subPath
kind: Deployment
apiVersion: apps/v1
metadata:
name: subpath-configmap-deploymemt
spec:
selector:
matchLabels:
app: subpath-configmap-deploymemt
template:
metadata:
labels:
app: subpath-configmap-deploymemt
spec:
containers:
- name: nginx
imagePullPolicy: IfNotPresent
image: nginx:latest
volumeMounts: # 挂载
- mountPath: /usr/share/nginx/html/index.html
name: nginx
subPath: nginx # 可解决多个 configmap 挂载同一目录，导致覆盖 名字与下面的key一样 - key: nginx
volumes:
- name: nginx
configMap:
name: configmap # 已经创建的configmap并且存在的
items:
- key: nginx
path: nginx
[root@kubernetes-master-01 ~]# vi subpath-configmap-deployment.yaml
[root@kubernetes-master-01 ~]# kubectl apply -f subpath-configmap-deployment.yaml
deployment.apps/subpath-configmap-deploymemt created
[root@kubernetes-master-01 ~]# kubectl get pods -l app=subpath-configmap-deploymemt
NAME READY STATUS RESTARTS AGE
subpath-configmap-deploymemt-5fd76f975c-l5jlx 1/1 Running 0 17s
[root@kubernetes-master-01 ~]# kubectl exec -it subpath-configmap-deploymemt-5fd76f975c-l5jlx -- bash
root@subpath-configmap-deploymemt-5fd76f975c-l5jlx:/# cd /usr/share/nginx/html/
root@subpath-configmap-deploymemt-5fd76f975c-l5jlx:/usr/share/nginx/html# ll
bash: ll: command not found
root@subpath-configmap-deploymemt-5fd76f975c-l5jlx:/usr/share/nginx/html# ls
50x.html index.html
root@subpath-configmap-deploymemt-5fd76f975c-l5jlx:/usr/share/nginx/html# cat index.html
upstream tomcatserver1 {
server 192.168.72.49:8081;
}
upstream tomcatserver2 {
server 192.168.72.49:8082;
}
server {
listen 80;
server_name 8081.max.com;
location / {
proxy_pass http://tomcatserver1;
index index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}
root@subpath-configmap-deploymemt-5fd76f975c-l5jlx:/usr/share/nginx/html# exit
exit
[root@kubernetes-master-01 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
empty-dir-796cf6fc58-h2rpf 2/2 Running 0 17d 10.241.24.3 kubernetes-node-02 <none> <none>
hfs-client-nfs-client-provisioner-5dd68bbddf-dn2lq 1/1 Running 3 17d 10.241.144.3 kubernetes-master-03 <none> <none>
hostpath-79f9457bc6-vcb6f 1/1 Running 3 17d 10.240.48.3 kubernetes-master-01 <none> <none>
nfs-pv-pvc-67f9f546f7-897d4 1/1 Running 3 17d 10.240.168.2 kubernetes-node-01 <none> <none>
nfs-pv-pvc-67f9f546f7-8ngw6 1/1 Running 2 17d 10.240.48.2 kubernetes-master-01 <none> <none>
nginx-569cc66c-7mnwc 1/1 Running 0 17d 10.241.24.2 kubernetes-node-02 <none> <none>
nginx-hpa-fb47f9ccb-zj2hg 1/1 Running 3 17d 10.241.144.4 kubernetes-master-03 <none> <none>
nginx-pod 1/1 Running 10 31d 10.242.128.3 kubernetes-master02 <none> <none>
subpath-configmap-deploymemt-5fd76f975c-l5jlx 1/1 Running 0 2m36s 10.240.168.4 kubernetes-node-01 <none> <none>
test 1/1 Running 2 17d 10.240.48.4 kubernetes-master-01 <none> <none>
test-nfs-storageclass-748b6f9c48-5q2qb 1/1 Running 3 17d 10.241.144.5 kubernetes-master-03 <none> <none>
[root@kubernetes-master-01 ~]# curl 10.240.168.4
upstream tomcatserver1 {
server 192.168.72.49:8081;
}
upstream tomcatserver2 {
server 192.168.72.49:8082;
}
server {
listen 80;
server_name 8081.max.com;
location / {
proxy_pass http://tomcatserver1;
index index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}
2.2、 configmap 热更新
# 热更新
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-nginx
spec:
selector:
matchLabels:
run: my-nginx
template:
metadata:
labels:
run: my-nginx
spec:
containers:
- name: my-nginx
image: nginx
ports:
- containerPort: 80
envFrom:
- configMapRef:
name: env-config
volumeMounts:
- mountPath: /usr/share/nginx/demo/
name: config
volumes:
- name: config
configMap:
name: env-config
items:
- key: log_level
path: log_level
replicas: 1
---
apiVersion: v1
kind: ConfigMap
metadata:
name: env-config
namespace: default
data:
log_level: INFO
创建热更新
[root@kubernetes-master-01 ~]# kubectl apply -f configmap-hot-update.yaml
deployment.apps/my-nginx created
configmap/env-config created
[root@kubernetes-master-01 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
empty-dir-796cf6fc58-h2rpf 2/2 Running 0 29d
hfs-client-nfs-client-provisioner-5dd68bbddf-dn2lq 1/1 Running 5 29d
hostpath-79f9457bc6-vcb6f 1/1 Running 4 29d
my-nginx-74f7b9d7fb-qr2sq 0/1 ContainerCreating 0 34s
nfs-pv-pvc-67f9f546f7-897d4 1/1 Running 5 29d
nfs-pv-pvc-67f9f546f7-8ngw6 1/1 Running 4 29d
nginx-569cc66c-7mnwc 1/1 Running 0 29d
nginx-hpa-fb47f9ccb-zj2hg 1/1 Running 4 29d
nginx-pod 1/1 Running 11 43d
subpath-configmap-deploymemt-5fd76f975c-l5jlx 1/1 Running 1 11d
test 1/1 Running 3 29d
test-nfs-storageclass-748b6f9c48-5q2qb 1/1 Running 4 29d
[root@kubernetes-master-01 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
empty-dir-796cf6fc58-h2rpf 2/2 Running 0 29d
hfs-client-nfs-client-provisioner-5dd68bbddf-dn2lq 1/1 Running 5 29d
hostpath-79f9457bc6-vcb6f 1/1 Running 4 29d
my-nginx-74f7b9d7fb-qr2sq 1/1 Running 0 93s
nfs-pv-pvc-67f9f546f7-897d4 1/1 Running 5 29d
nfs-pv-pvc-67f9f546f7-8ngw6 1/1 Running 4 29d
nginx-569cc66c-7mnwc 1/1 Running 0 29d
nginx-hpa-fb47f9ccb-zj2hg 1/1 Running 4 29d
nginx-pod 1/1 Running 11 43d
subpath-configmap-deploymemt-5fd76f975c-l5jlx 1/1 Running 1 11d
test 1/1 Running 3 29d
test-nfs-storageclass-748b6f9c48-5q2qb 1/1 Running 4 29d
[root@kubernetes-master-01 ~]# kubectl exec -it my-nginx-74f7b9d7fb-qr2sq -- bash
root@my-nginx-74f7b9d7fb-qr2sq:/# cd /usr/share/nginx/demo/
root@my-nginx-74f7b9d7fb-qr2sq:/usr/share/nginx/demo# ls
log_level
root@my-nginx-74f7b9d7fb-qr2sq:/usr/share/nginx/demo# cat log_level
INFOroot@my-nginx-74f7b9d7fb-qr2sq:/usr/share/nginx/demo# cat log_level
INFOroot@my-nginx-74f7b9d7fb-qr2sq:/usr/share/nginx/demo#
热更新
[root@kubernetes-master-01 ~]# kubectl get configmaps
NAME DATA AGE
calue 2 11d
configmap 1 11d
env-config 1 6m43s
nfs 4 12d
test-configmap 1 12d
[root@kubernetes-master-01 ~]# kubectl edit configmaps env-config
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
log_level: INFO
kind: ConfigMap
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"v1","data":{"log_level":"INFO"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"env-config","namespace":"default"}}
creationTimestamp: "2021-04-19T14:22:34Z"
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:data:
.: {}
f:log_level: {}
f:metadata:
f:annotations:
.: {}
f:kubectl.kubernetes.io/last-applied-configuration: {}
manager: kubectl
operation: Update
time: "2021-04-19T14:22:34Z"
name: env-config
namespace: default
resourceVersion: "610639"
selfLink: /api/v1/namespaces/default/configmaps/env-config
uid: 8f1dd1b1-fed2-419e-bb8b-a81c19ca0bce
3、 Secret
Secret 解决了密码、token、密钥等敏感数据的配置问题，而不需要把这些敏感数据暴露到镜像或者 Pod Spec 中。Secret 可以以 Volume 或者环境变量的方式使用
Secret 有三种类型：
- Service Account ： 用 来 访 问 Kubernetes API ， 由 Kubernetes 自 动 创 建 ， 并 且 会 自 动 挂 载 到 Pod 的 /run/secrets/kubernetes.io/serviceaccount 目录中
- Opaque ：base64 编码格式的 Secret，用来存储密码、密钥等；
- kubernetes.io/dockerconfigjson ：用来存储私有 docker registry 的认
3.1、 Opaque Secret
Opaque 类型的数据是一个 map 类型，要求 value 是 base64
3.1.1、编写 secret 配置清单
3.1.2、创建 secret 资
3.1.3、编写测试应用配置清单
3.1.4、创建测试资源
3.2、 kubernetes.io/dockerconf
用来存储私有 docker registry 的认证
3.2.1、创建 secret
3.2.2、创建测试 secret
3.3、 Service Account
Service Account 用 来 访 问 Kubernetes API ， 由 Kubernetes 自 动 创 建 ， 并 且 会 自 动 挂 载 到 Pod 的 /run/secrets/kubernetes.io/serviceaccount 目录中
在当下的阶段，必将由程序员来主导，甚至比以往更甚。
