CoreOS: Operator
StatefulSet:
cattle, pet
PetSet -> StatefulSet
1、稳定且唯一的网络标识符；
2、稳定且持久的存储；
3、有序、平滑的部署和扩展；
4、有序、平滑的终止和删除；
5、有序的滚动更新；
三个组件：headless service、StatefulSet、volumeClaimTemplate
pod_name.service_name.ns_name.svc.cluster.local
myapp-0.myapp.default.svc.cluster.local
master:
[root@master manifests]# mkdir chapter9
[root@master manifests]# cd chapter9/
[root@master chapter9]# vim stateful-demo.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp-svc
labels:
app: myapp-svc
spec:
ports:
- port: 80
name: web
clusterIP: None
selector:
app: myapp-pod
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: myapp
spec:
serviceName: myapp-svc
replicas: 2
selector:
matchLabels:
app: myapp-pod
template:
metadata:
labels:
app: myapp-pod
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v5
ports:
- containerPort: 80
name: web
volumeMounts:
- name: myappdata
mountPath: /usr/share/nginx/html
volumeClaimTemplates:
- metadata:
name: myappdata
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "gluster-dynamic"
resources:
requests:
storage: 2Gi
stor01:
[root@stor01 ~]# showmount -e Export list for stor01.smoke.com: /data/volumes/v5 172.20.0.0/16 /data/volumes/v4 172.20.0.0/16 /data/volumes/v3 172.20.0.0/16 /data/volumes/v2 172.20.0.0/16 /data/volumes/v1 172.20.0.0/16
master:
[root@master chapter9]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 2Gi RWO,RWX Retain Available 2d
pv002 5Gi RWO Retain Available 2d
pv003 20Gi RWO,RWX Retain Available 2d
pv004 10Gi RWO,RWX Retain Bound default/mypvc 2d
pv005 10Gi RWO,RWX Retain Available 2d
[root@master chapter9]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mypvc Bound pv004 10Gi RWO,RWX 2d
[root@master chapter9]# kubectl get pods
NAME READY STATUS RESTARTS AGE
myapp-deploy-67f6f6b4dc-642hc 1/1 Running 0 10d
myapp-deploy-67f6f6b4dc-d4cpv 1/1 Running 0 10d
myapp-deploy-67f6f6b4dc-rqj8g 1/1 Running 0 10d
pod-cm-3 1/1 Running 0 23h
pod-secret-1 1/1 Running 0 58m
pod-vol-hostpath 1/1 Running 0 6d
pod-vol-pvc 1/1 Running 0 2d
tomcat-deploy-588c79d48d-6r8dw 1/1 Running 0 8d
tomcat-deploy-588c79d48d-cjlj9 1/1 Running 0 8d
tomcat-deploy-588c79d48d-r7nfq 1/1 Running 0 8d
[root@master chapter9]# kubectl delete pods pod-vol-pvc
[root@master chapter9]# kubectl delete pods/pod-cm-3 pods/pod-secret-1
[root@master configmap]# kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
myapp-deploy 3 3 3 3 10d
tomcat-deploy 3 3 3 3 9d
[root@master configmap]# kubectl delete deploy/myapp-deploy deploy/tomcat-deploy
[root@master configmap]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 2Gi RWO,RWX Retain Available 2d
pv002 5Gi RWO Retain Available 2d
pv003 20Gi RWO,RWX Retain Available 2d
pv004 10Gi RWO,RWX Retain Bound default/mypvc 2d
pv005 10Gi RWO,RWX Retain Available 2d
[root@master configmap]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mypvc Bound pv004 10Gi RWO,RWX 2d
[root@master configmap]# kubectl delete pvc/mypvc
[root@master configmap]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 2Gi RWO,RWX Retain Available 2d
pv002 5Gi RWO Retain Available 2d
pv003 20Gi RWO,RWX Retain Available 2d
pv004 10Gi RWO,RWX Retain Released default/mypvc 2d
pv005 10Gi RWO,RWX Retain Available 2d
[root@master configmap]# kubectl delete pv --all
[root@master configmap]# cd ../volumes/
[root@master volumes]# vim pv-demo.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv001
labels:
name: pv001
spec:
nfs:
path: /data/volumes/v1
server: stor01.smoke.com
accessModes: ["ReadWriteMany","ReadWriteOnce"]
capacity:
storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv002
labels:
name: pv002
spec:
nfs:
path: /data/volumes/v2
server: stor01.smoke.com
accessModes: ["ReadWriteOnce"]
capacity:
storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv003
labels:
name: pv003
spec:
nfs:
path: /data/volumes/v3
server: stor01.smoke.com
accessModes: ["ReadWriteMany","ReadWriteOnce"]
capacity:
storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv004
labels:
name: pv004
spec:
nfs:
path: /data/volumes/v4
server: stor01.smoke.com
accessModes: ["ReadWriteMany","ReadWriteOnce"]
capacity:
storage: 10Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv005
labels:
name: pv005
spec:
nfs:
path: /data/volumes/v5
server: stor01.smoke.com
accessModes: ["ReadWriteMany","ReadWriteOnce"]
capacity:
storage: 10Gi
[root@master volumes]# kubectl get pv
[root@master volumes]# kubectl apply -f pv-demo.yaml
[root@master volumes]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 5Gi RWO,RWX Retain Available 57s
pv002 5Gi RWO Retain Available 57s
pv003 5Gi RWO,RWX Retain Available 57s
pv004 10Gi RWO,RWX Retain Available 57s
pv005 10Gi RWO,RWX Retain Available 57s
[root@master chapter9]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 16d
myapp ClusterIP 10.107.225.188 <none> 80/TCP 11d
tomcat ClusterIP 10.103.159.201 <none> 8080/TCP,8009/TCP 9d
[root@master chapter9]# kubectl delete svc/myapp svc/tomcat
[root@master volumes]# cd ../chapter9/
[root@master chapter9]# kubectl explain sts
[root@master chapter9]# kubectl explain sts.spec
[root@master chapter9]# vim stateful-demo.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp
labels:
app: myapp
spec:
ports:
- port: 80
name: web
clusterIP: None
selector:
app: myapp-pod
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: myapp
spec:
serviceName: myapp
replicas: 3
selector:
matchLabels:
app: myapp-pod
template:
metadata:
labels:
app: myapp-pod
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
ports:
- containerPort: 80
name: web
volumeMounts:
- name: myappdata
mountPath: /usr/share/nginx/html
volumeClaimTemplates:
- metadata:
name: myappdata
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 5Gi
[root@master chapter9]# kubectl apply -f stateful-demo.yaml
[root@master chapter9]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 16d
myapp ClusterIP None <none> 80/TCP 16s
[root@master chapter9]# kubectl get sts
NAME DESIRED CURRENT AGE
myapp 3 3 1m
[root@master chapter9]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
myappdata-myapp-0 Bound pv002 5Gi RWO 5m
myappdata-myapp-1 Bound pv001 5Gi RWO,RWX 5m
myappdata-myapp-2 Bound pv003 5Gi RWO,RWX 5m
[root@master chapter9]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv001 5Gi RWO,RWX Retain Bound default/myappdata-myapp-1 42m
pv002 5Gi RWO Retain Bound default/myappdata-myapp-0 42m
pv003 5Gi RWO,RWX Retain Bound default/myappdata-myapp-2 42m
pv004 10Gi RWO,RWX Retain Available 42m
pv005 10Gi RWO,RWX Retain Available 42m
[root@master chapter9]# kubectl get pods
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 5m
myapp-1 1/1 Running 0 5m
myapp-2 1/1 Running 0 5m
pod-vol-hostpath 1/1 Running 0 7d
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 6m
myapp-1 1/1 Running 0 6m
myapp-2 1/1 Running 0 6m
pod-vol-hostpath 1/1 Running 0 7d
[root@master chapter9]# kubectl delete -f stateful-demo.yaml
[root@master chapter9]# kubectl get pods -w #删除一个个删除
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 6m
myapp-1 1/1 Running 0 6m
myapp-2 1/1 Running 0 6m
pod-vol-hostpath 1/1 Running 0 7d
myapp-1 1/1 Terminating 0 6m
myapp-0 1/1 Terminating 0 6m
myapp-2 1/1 Terminating 0 6m
myapp-1 0/1 Terminating 0 6m
myapp-0 0/1 Terminating 0 6m
myapp-2 0/1 Terminating 0 6m
myapp-1 0/1 Terminating 0 6m
myapp-1 0/1 Terminating 0 6m
myapp-0 0/1 Terminating 0 6m
myapp-0 0/1 Terminating 0 6m
myapp-2 0/1 Terminating 0 6m
myapp-2 0/1 Terminating 0 6m
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
pod-vol-hostpath 1/1 Running 0 7d
[root@master chapter9]# kubectl apply -f stateful-demo.yaml
[root@master chapter9]# kubectl get pods -w #创建一个个创建
NAME READY STATUS RESTARTS AGE
pod-vol-hostpath 1/1 Running 0 7d
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 ContainerCreating 0 0s
myapp-0 1/1 Running 0 1s
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 ContainerCreating 0 0s
myapp-1 1/1 Running 0 2s
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 ContainerCreating 0 0s
myapp-2 1/1 Running 0 1s
[root@master chapter9]# kubectl delete -f stateful-demo.yaml
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
pod-vol-hostpath 1/1 Running 0 7d
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 ContainerCreating 0 0s
myapp-0 1/1 Running 0 1s
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 ContainerCreating 0 0s
myapp-1 1/1 Running 0 2s
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 ContainerCreating 0 0s
myapp-2 1/1 Running 0 1s
myapp-1 1/1 Terminating 0 3m
myapp-0 1/1 Terminating 0 3m
myapp-2 1/1 Terminating 0 3m
myapp-2 0/1 Terminating 0 3m
myapp-0 0/1 Terminating 0 3m
myapp-1 0/1 Terminating 0 3m
myapp-2 0/1 Terminating 0 3m
myapp-2 0/1 Terminating 0 3m
myapp-0 0/1 Terminating 0 3m
myapp-0 0/1 Terminating 0 3m
myapp-1 0/1 Terminating 0 3m
myapp-1 0/1 Terminating 0 3m
[root@master chapter9]# kubectl get pvc #pvc不会删除,再创建继续绑定,持续存储
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
myappdata-myapp-0 Bound pv002 5Gi RWO 19m
myappdata-myapp-1 Bound pv001 5Gi RWO,RWX 19m
myappdata-myapp-2 Bound pv003 5Gi RWO,RWX 19m
[root@master chapter9]# kubectl apply -f stateful-demo.yaml
[root@master chapter9]# kubectl describe pods myapp-2
Volumes:
myappdata:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: myappdata-myapp-2 #无论怎么创建都绑定同一个pvc
ReadOnly: false
default-token-jrx89:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-jrx89
Optional: false
[root@master chapter9]# kubectl get pods
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 8m
myapp-1 1/1 Running 0 8m
myapp-2 1/1 Running 0 8m
pod-vol-hostpath 1/1 Running 0 7d
[root@master chapter9]# kubectl exec -it myapp-0 -- /bin/sh
/ # nslookup myapp-0.myapp.default.svc.cluster.local #无头服务要跟上无头服务名称
nslookup: can't resolve '(null)': Name does not resolve
Name: myapp-0.myapp.default.svc.cluster.local
Address 1: 10.244.1.44 myapp-0.myapp.default.svc.cluster.local
/ # nslookup myapp-1.myapp.default.svc.cluster.local
nslookup: can't resolve '(null)': Name does not resolve
Name: myapp-1.myapp.default.svc.cluster.local
Address 1: 10.244.2.53 myapp-1.myapp.default.svc.cluster.local
/ # nslookup myapp-2.myapp.default.svc.cluster.local
nslookup: can't resolve '(null)': Name does not resolve
Name: myapp-2.myapp.default.svc.cluster.local
Address 1: 10.244.1.45 myapp-2.myapp.default.svc.cluster.local
[root@master chapter9]# kubectl get pvc #pvc名字都隐含了pod名字,所以使得可以持续为同一个pod所使用
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
myappdata-myapp-0 Bound pv002 5Gi RWO 48m
myappdata-myapp-1 Bound pv001 5Gi RWO,RWX 48m
myappdata-myapp-2 Bound pv003 5Gi RWO,RWX 48m
[root@master chapter9]# kubectl get pods -w
[root@master chapter9]# kubectl scale sts myapp --replicas=5 #扩容为5个
[root@master ~]# cd manifests/chapter9/
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 23h
myapp-1 1/1 Running 0 23h
myapp-2 1/1 Running 0 23h
pod-vol-hostpath 1/1 Running 0 8d
myapp-3 0/1 Pending 0 0s
myapp-3 0/1 Pending 0 0s
myapp-3 0/1 Pending 0 0s
myapp-3 0/1 ContainerCreating 0 0s
myapp-3 1/1 Running 0 2s
myapp-4 0/1 Pending 0 0s
myapp-4 0/1 Pending 0 0s
myapp-4 0/1 Pending 0 0s
myapp-4 0/1 ContainerCreating 0 0s
myapp-4 1/1 Running 0 1s
[root@master chapter9]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
myappdata-myapp-0 Bound pv002 5Gi RWO 23h
myappdata-myapp-1 Bound pv001 5Gi RWO,RWX 23h
myappdata-myapp-2 Bound pv003 5Gi RWO,RWX 23h
myappdata-myapp-3 Bound pv004 10Gi RWO,RWX 43s
myappdata-myapp-4 Bound pv005 10Gi RWO,RWX 41s
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 23h
myapp-1 1/1 Running 0 23h
myapp-2 1/1 Running 0 23h
myapp-3 1/1 Running 0 1m
myapp-4 1/1 Running 0 1m
pod-vol-hostpath 1/1 Running 0 8d
[root@master chapter9]# kubectl patch sts myapp -p '{"spec":{"replicas":2}}' #缩减为2个pod
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 23h
myapp-1 1/1 Running 0 23h
myapp-2 1/1 Running 0 23h
myapp-3 1/1 Running 0 1m
myapp-4 1/1 Running 0 1m
pod-vol-hostpath 1/1 Running 0 8d
myapp-4 1/1 Terminating 0 3m
myapp-4 0/1 Terminating 0 3m
myapp-4 0/1 Terminating 0 3m
myapp-4 0/1 Terminating 0 3m
myapp-3 1/1 Terminating 0 3m
myapp-3 0/1 Terminating 0 3m
myapp-3 0/1 Terminating 0 3m
myapp-3 0/1 Terminating 0 3m
myapp-2 1/1 Terminating 0 23h
myapp-2 0/1 Terminating 0 23h
myapp-2 0/1 Terminating 0 23h
myapp-2 0/1 Terminating 0 23h
[root@master chapter9]# kubectl explain sts.spec
[root@master chapter9]# kubectl explain sts.spec.updateStrategy
[root@master chapter9]# kubectl explain sts.spec.updateStrategy.rollingUpdate
[root@master chapter9]# kubectl patch sts myapp -p '{"spec":{"replicas":5}}'
[root@master chapter9]# kubectl describe sts myapp
Update Strategy: RollingUpdate
[root@master chapter9]# kubectl explain sts.spec
[root@master chapter9]# kubectl explain sts.spec.updateStrategy
[root@master chapter9]# kubectl explain sts.spec.updateStrategy.rollingUpdate
[root@master chapter9]# kubectl patch sts myapp -p '{"spec":{"updateStrategy":{"rollingUpdate":{"partition":4}}}}' #修改更新策略分区为大于等于4
[root@master chapter9]# kubectl describe sts myapp
Update Strategy: RollingUpdate
Partition: 4
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 23h
myapp-1 1/1 Running 0 23h
myapp-2 1/1 Running 0 17m
myapp-3 1/1 Running 0 17m
myapp-4 1/1 Running 0 17m
pod-vol-hostpath 1/1 Running 0 8d
[root@master chapter9]# kubectl set image --help
[root@master chapter9]# kubectl set image sts/myapp myapp=ikubernetes/myapp:v2
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 23h
myapp-1 1/1 Running 0 23h
myapp-2 1/1 Running 0 17m
myapp-3 1/1 Running 0 17m
myapp-4 1/1 Running 0 17m
pod-vol-hostpath 1/1 Running 0 8d
myapp-4 1/1 Terminating 0 33m
myapp-4 0/1 Terminating 0 33m
myapp-4 0/1 Terminating 0 33m
myapp-4 0/1 Terminating 0 33m
myapp-4 0/1 Pending 0 0s
myapp-4 0/1 Pending 0 0s
myapp-4 0/1 ContainerCreating 0 0s
myapp-4 1/1 Running 0 1s
[root@master chapter9]# kubectl get sts -o wide
NAME DESIRED CURRENT AGE CONTAINERS IMAGES
myapp 5 5 1d myapp ikubernetes/myapp:v2
[root@master chapter9]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myapp-0 1/1 Running 0 1d 10.244.1.44 node01.smoke.com
myapp-1 1/1 Running 0 1d 10.244.2.53 node02.smoke.com
myapp-2 1/1 Running 0 34m 10.244.2.55 node02.smoke.com
myapp-3 1/1 Running 0 34m 10.244.1.47 node01.smoke.com
myapp-4 1/1 Running 0 1m 10.244.1.49 node01.smoke.com
pod-vol-hostpath 1/1 Running 0 8d 10.244.2.43 node02.smoke.com
[root@master chapter9]# kubectl get pods myapp-4 -o yaml
status:
conditions:
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:41:01Z
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:41:02Z
status: "True"
type: Ready
- lastProbeTime: null
lastTransitionTime: null
status: "True"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:41:01Z
status: "True"
type: PodScheduled
containerStatuses:
- containerID: docker://a60ecec5422ab8751644714fbf12d630fae082de565ec421af7d18142c159d15
image: ikubernetes/myapp:v2 #版本升级为v2
imageID: docker-pullable://ikubernetes/myapp@sha256:85a2b81a62f09a414ea33b74fb8aa686ed9b168294b26b4c819df0be0712d358
lastState: {}
name: myapp
ready: true
restartCount: 0
state:
running:
startedAt: 2020-07-03T13:41:02Z
hostIP: 172.20.0.66
phase: Running
podIP: 10.244.1.49
qosClass: BestEffort
startTime: 2020-07-03T13:41:01Z
[root@master chapter9]# kubectl get pods myapp-3 -o yaml
status:
conditions:
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:07:09Z
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:07:11Z
status: "True"
type: Ready
- lastProbeTime: null
lastTransitionTime: null
status: "True"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:07:09Z
status: "True"
type: PodScheduled
containerStatuses:
- containerID: docker://e5fd6f3d53fe85c0919011204961c86335a33e65930363106f5dfc15e0b8991f
image: ikubernetes/myapp:v1 #myapp-3还是v1
imageID: docker-pullable://ikubernetes/myapp@sha256:9c3dc30b5219788b2b8a4b065f548b922a34479577befb54b03330999d30d513
lastState: {}
name: myapp
ready: true
restartCount: 0
state:
running:
startedAt: 2020-07-03T13:07:11Z
hostIP: 172.20.0.66
phase: Running
podIP: 10.244.1.47
qosClass: BestEffort
startTime: 2020-07-03T13:07:09Z
[root@master chapter9]# kubectl get pods myapp-0 -o yaml
status:
conditions:
- lastProbeTime: null
lastTransitionTime: 2020-07-02T13:40:21Z
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: 2020-07-02T13:40:22Z
status: "True"
type: Ready
- lastProbeTime: null
lastTransitionTime: null
status: "True"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: 2020-07-02T13:40:21Z
status: "True"
type: PodScheduled
containerStatuses:
- containerID: docker://589b75812a1e0e2e4e2cc2948390f8738c0d69fecc2283f9c7bbadfa4260dcb7
image: ikubernetes/myapp:v1 myapp-0也是v1版本
imageID: docker-pullable://ikubernetes/myapp@sha256:9c3dc30b5219788b2b8a4b065f548b922a34479577befb54b03330999d30d513
lastState: {}
name: myapp
ready: true
restartCount: 0
state:
running:
startedAt: 2020-07-02T13:40:22Z
hostIP: 172.20.0.66
phase: Running
podIP: 10.244.1.44
qosClass: BestEffort
startTime: 2020-07-02T13:40:21Z
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 1d
myapp-1 1/1 Running 0 1d
myapp-2 1/1 Running 0 44m
myapp-3 1/1 Running 0 44m
myapp-4 1/1 Running 0 10m
pod-vol-hostpath 1/1 Running 0 8d
[root@master chapter9]# kubectl patch sts myapp -p '{"spec":{"updateStrategy":{"rollingUpdate":{"partition":0}}}}'
[root@master chapter9]# kubectl get pods -w
NAME READY STATUS RESTARTS AGE
myapp-0 1/1 Running 0 1d
myapp-1 1/1 Running 0 1d
myapp-2 1/1 Running 0 44m
myapp-3 1/1 Running 0 44m
myapp-4 1/1 Running 0 10m
pod-vol-hostpath 1/1 Running 0 8d
myapp-3 1/1 Terminating 0 47m
myapp-3 0/1 Terminating 0 47m
myapp-3 0/1 Terminating 0 47m
myapp-3 0/1 Terminating 0 47m
myapp-3 0/1 Pending 0 0s
myapp-3 0/1 Pending 0 0s
myapp-3 0/1 ContainerCreating 0 0s
myapp-3 1/1 Running 0 1s
myapp-2 1/1 Terminating 0 47m
myapp-2 0/1 Terminating 0 47m
myapp-2 0/1 Terminating 0 47m
myapp-2 0/1 Terminating 0 47m
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 Pending 0 0s
myapp-2 0/1 ContainerCreating 0 0s
myapp-2 1/1 Running 0 2s
myapp-1 1/1 Terminating 0 1d
myapp-1 0/1 Terminating 0 1d
myapp-1 0/1 Terminating 0 1d
myapp-1 0/1 Terminating 0 1d
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 Pending 0 0s
myapp-1 0/1 ContainerCreating 0 0s
myapp-1 1/1 Running 0 1s
myapp-0 1/1 Terminating 0 1d
myapp-0 0/1 Terminating 0 1d
myapp-0 0/1 Terminating 0 1d
myapp-0 0/1 Terminating 0 1d
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 Pending 0 0s
myapp-0 0/1 ContainerCreating 0 0s
myapp-0 1/1 Running 0 2s
[root@master chapter9]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
myapp-0 1/1 Running 0 3m 10.244.1.51 node01.smoke.com
myapp-1 1/1 Running 0 3m 10.244.2.57 node02.smoke.com
myapp-2 1/1 Running 0 3m 10.244.2.56 node02.smoke.com
myapp-3 1/1 Running 0 4m 10.244.1.50 node01.smoke.com
myapp-4 1/1 Running 0 17m 10.244.1.49 node01.smoke.com
pod-vol-hostpath 1/1 Running 0 8d 10.244.2.43 node02.smoke.com
[root@master chapter9]# curl 10.244.1.51
<html>
<head><title>403 Forbidden</title></head>
<body bgcolor="white">
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx/1.12.2</center>
</body>
</html>
[root@master chapter9]# curl 10.244.1.51/hostname.html
myapp-0
[root@master chapter9]# kubectl get pods myapp-0 -o yaml
status:
conditions:
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:55:03Z
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:55:05Z
status: "True"
type: Ready
- lastProbeTime: null
lastTransitionTime: null
status: "True"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: 2020-07-03T13:55:03Z
status: "True"
type: PodScheduled
containerStatuses:
- containerID: docker://b15c81fb898fa499e689469bda2d929e2bc2f6d9cdc121cf49a1095fee982538
image: ikubernetes/myapp:v2 #已经是v2版本
imageID: docker-pullable://ikubernetes/myapp@sha256:85a2b81a62f09a414ea33b74fb8aa686ed9b168294b26b4c819df0be0712d358
lastState: {}
name: myapp
ready: true
restartCount: 0
state:
running:
startedAt: 2020-07-03T13:55:04Z
hostIP: 172.20.0.66
phase: Running
podIP: 10.244.1.51
qosClass: BestEffort
startTime: 2020-07-03T13:55:03Z
[root@master chapter9]# kubectl get pods -o go-template={.status.containerStatuses[0].image}
{.status.containerStatuses[0].image}[root@master chapter9]#
[root@master chapter9]# kubectl get pods -o go-template={status.containerStatuses[0].image}
{status.containerStatuses[0].image}[root@master chapter9]#
kubernetes statefulset redis:
https://github.com/CommercialTribe/kube-redis/blob/develop/k8s/redis-node-statefulset.yaml
https://github.com/k8sdevopscookbook/src/commit/77a39cde468567bc68582b8bea38246c12675da1
master:
[root@master chapter9]# vim etcd-statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: etcd
labels:
spec:
serviceName: etcd
# changing replicas value will require a manual etcdctl member remove/add
# # command (remove before decreasing and add after increasing)
replicas: 3
selector:
matchLabels:
app: etcd-member
template:
metadata:
name: etcd
labels:
app: etcd-member
spec:
containers:
- name: etcd
image: "quay.io/coreos/etcd:v3.2.16"
ports:
- containerPort: 2379
name: client
- containerPort: 2380
name: peer
env:
- name: CLUSTER_SIZE
value: "3"
- name: SET_NAME
value: "etcd"
volumeMounts:
- name: data
mountPath: /var/run/etcd
command:
- "/bin/sh"
- "-ecx"
- |
IP=$(hostname -i)
PEERS=""
for i in $(seq 0 $((${CLUSTER_SIZE} - 1))); do
PEERS="${PEERS}${PEERS:+,}${SET_NAME}-${i}=http://${SET_NAME}-${i}.${SET_NAME}:2380"
done
# start etcd. If cluster is already initialized the `--initial-*` options will be ignored.
exec etcd --name ${HOSTNAME} \
--listen-peer-urls http:/${IP}:2380 \
--listen-client-urls http://${IP}:2379,http://127.0.0.1:2379 \
--advertise-client-urls http://${HOSTNAME}.${SET_NAME}:2379 \
--initial-advertise-peer-urls http://${HOSTNAME}.${SET_NAME}:2380 \
--initial-cluster-token etcd-cluster-1 \
--initial-cluster ${PEERS} \
--initial-cluster-state new \
--data-dir /var/run/etcd/default.etcd
volumeClaimTemplates:
- metadata:
name: data
spec:
storageClassName: gluster-dynamic
accessModes:
- "ReadWriteOnce"
resources:
requests:
storage: 1Gi
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