hpa应用例子
环境:
OS:Centos 7
k8s:1.24.0
1.开启 API Aggregator
该步骤只在master节点上操作
如下图所示添加如下项目
vi /etc/kubernetes/manifests/kube-apiserver.yaml
- --enable-aggregator-routing=true
文件保存后k8s会自动重启
2.安装metrics-server
k8s默认是没有安装该组件的，需要单独安装，安装参考如下连接
https://www.cnblogs.com/hxlasky/p/18818497
3.安装ab工具
在k8s其中一个节点上安装即可
yum install httpd-tools
确保有如下命令
[root@node2 home]# which ab
/usr/bin/ab
4.部署deployment
我这里使用nginx做为部署例子使用
提前创建好名称空间
kubectl create namespace ns-hpa
[root@master hpa]# more nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: ns-hpa
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: registry.cn-shenzhen.aliyuncs.com/hxlk8s/nginx:stable-alpine
ports:
- containerPort: 80
resources:
limits:
cpu: "200m"
requests:
cpu: "100m"
kubectl apply -f nginx-deployment.yaml
4.部署service对外服务(nodeport)
[root@master hpa]# more nginx-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-sc
namespace: ns-hpa
spec:
type: NodePort
selector:
app: nginx
ports:
- name: nginx-port
port: 80
targetPort: 80
protocol: TCP
nodePort: 30000
kubectl apply -f nginx-nodeport.yaml
这里部署好了之后，尝试使用如下命令进行访问
[root@node2 home]# curl http://192.168.1.105:30000/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
或是浏览器访问
5.部署hpa
[root@master hpa]# more hpa.yaml
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: nginx-deployment-hpa
namespace: ns-hpa
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: nginx-deployment
minReplicas: 1
maxReplicas: 10
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 10
这里设置通过cpu利用率进行扩容,超过10%就会触发扩容
kubectl apply -f hpa.yaml
6.压测模拟触发
先观察pod运行情况
[root@master hpa]# kubectl get pods -n ns-hpa -w
NAME READY STATUS RESTARTS AGE
nginx-deployment-cb5988cbd-tchrh 1/1 Running 1 (6h41m ago) 22h
nginx-deployment-cb5988cbd-94pbp 0/1 Pending 0 0s
nginx-deployment-cb5988cbd-94pbp 0/1 Pending 0 0s
nginx-deployment-cb5988cbd-z8bq4 0/1 Pending 0 0s
nginx-deployment-cb5988cbd-bpr8s 0/1 Pending 0 0s
nginx-deployment-cb5988cbd-z8bq4 0/1 Pending 0 0s
nginx-deployment-cb5988cbd-bpr8s 0/1 Pending 0 0s
执行压测命令
[root@node2 home]# ab -n 100000 -c 800 http://192.168.1.105:30000/
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.1.105 (be patient)
可以看到pod进行了扩容
[root@master ~]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
cert-manager cert-manager-bcc6fc947-g4jvd 1/1 Running 6 (12m ago) 7d22h
cert-manager cert-manager-cainjector-74b489f78f-pmh8m 1/1 Running 9 (12m ago) 7d22h
cert-manager cert-manager-webhook-68dc7956b4-n2j4j 1/1 Running 6 (6h46m ago) 7d22h
kube-system calico-kube-controllers-6b668cd977-lv54j 1/1 Running 5 (6h46m ago) 7d23h
kube-system calico-node-gpdrp 1/1 Running 6 (6h46m ago) 7d23h
kube-system calico-node-klbrm 1/1 Running 5 (6h46m ago) 7d23h
kube-system calico-node-vtmch 1/1 Running 5 (6h46m ago) 7d23h
kube-system coredns-c676cc86f-6rrp4 1/1 Running 6 (6h46m ago) 7d21h
kube-system coredns-c676cc86f-pjl52 1/1 Running 5 (6h46m ago) 7d21h
kube-system etcd-master 1/1 Running 6 (6h46m ago) 7d21h
kube-system kube-apiserver-master 1/1 Running 0 12m
kube-system kube-controller-manager-master 1/1 Running 6 (12m ago) 7d21h
kube-system kube-proxy-ptb4h 1/1 Running 6 (6h46m ago) 7d21h
kube-system kube-proxy-v6b8x 1/1 Running 5 (6h46m ago) 7d21h
kube-system kube-proxy-xjmxk 1/1 Running 5 (6h46m ago) 7d21h
kube-system kube-scheduler-master 1/1 Running 6 (12m ago) 7d21h
kube-system metrics-server-7667bfbfbb-vrn6z 1/1 Running 0 75m
middleware milvus-dev-milvus-datanode-555c8859fc-nqdjw 1/1 Running 4 (6h46m ago) 6d22h
middleware milvus-dev-milvus-indexnode-68f89cbb65-bj6p8 1/1 Running 4 (6h46m ago) 6d22h
middleware milvus-dev-milvus-mixcoord-5879ddb6bf-zq5qb 1/1 Running 4 (6h46m ago) 6d22h
middleware milvus-dev-milvus-proxy-6d7656657f-pwm29 1/1 Running 4 (6h46m ago) 6d22h
middleware milvus-dev-milvus-querynode-0-5cd5fb96b6-j5xzc 1/1 Running 4 (6h46m ago) 6d22h
milvus-operator milvus-operator-75bccd859c-gxj2j 1/1 Running 13 (12m ago) 7d22h
ns-hpa nginx-deployment-cb5988cbd-446pq 1/1 Running 0 3m46s
ns-hpa nginx-deployment-cb5988cbd-6l2k7 1/1 Running 0 4m1s
ns-hpa nginx-deployment-cb5988cbd-94pbp 1/1 Running 0 4m16s
ns-hpa nginx-deployment-cb5988cbd-bpr8s 1/1 Running 0 4m16s
ns-hpa nginx-deployment-cb5988cbd-m6fkq 1/1 Running 0 4m1s
ns-hpa nginx-deployment-cb5988cbd-nn24p 1/1 Running 0 4m1s
ns-hpa nginx-deployment-cb5988cbd-pbdmk 1/1 Running 0 3m46s
ns-hpa nginx-deployment-cb5988cbd-rbzh2 1/1 Running 0 4m1s
ns-hpa nginx-deployment-cb5988cbd-tchrh 1/1 Running 1 (6h46m ago) 22h
ns-hpa nginx-deployment-cb5988cbd-z8bq4 1/1 Running 0 4m16s
ns-mysql hxl-mysql-deploy-5c579f8d6f-qp55t 1/1 Running 3 (6h46m ago) 2d22h
velero velero-75cd89cf9b-fjvcw 1/1 Running 4 (6h46m ago) 6d22h
压测完成后，过1-2分钟,hpa会进行自动缩容。
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