kubernetes Metrics-server 安装

1、Metrics-server安装：

因为使用自动扩容，得安装heapster或metrics-server（因为heapster中止更新故用metrics-server）：

1、安装以前须要为kubernetes增长配置项：

一、为/etc/kubernetes/controller-manager增长启动项：
  ***
    --horizontal-pod-autoscaler-use-rest-clients=true
  ***
 systemctl restart kube-controller-manager

二、为/usr/lib/systemd/system/kube-apiserver.service增长启动项（也能够修改/etc/kubernetes/apiserver文件增长）：
  ***
    --requestheader-client-ca-file=/etc/kubernetes/ssl/ca.pem \
    --requestheader-allowed-names=  \
    --requestheader-extra-headers-prefix=X-Remote-Extra- \
    --requestheader-group-headers=X-Remote-Group \
    --requestheader-username-headers=X-Remote-User \
    --proxy-client-cert-file=/etc/kubernetes/ssl/kubelet-client.crt \
    --proxy-client-key-file=/etc/kubernetes/ssl/kubelet-client.key \
    --enable-aggregator-routing=true
  ***
 systemctl daemon-reload
 systemctl restart kube-apiserver

二、在kubenetes上安装Metrics-server：

一、建立：
kubectl create -f metrics-server.yml 

二、删除：
kubectl delete ServiceAccount metrics-server -n kube-system
kubectl delete ClusterRoleBinding metrics-server:system:auth-delegator -n kube-system
kubectl delete RoleBinding metrics-server-auth-reader -n kube-system
kubectl delete ClusterRole system:metrics-server -n kube-system
kubectl delete  ClusterRoleBinding system:metrics-server -n kube-system
kubectl delete  APIService v1beta1.metrics.k8s.io -n kube-system
kubectl delete Service metrics-server -n kube-system
kubectl delete Deployment metrics-server -n kube-system

注：要修改metrics-server的镜

--- apiVersion: v1 kind: ServiceAccount metadata: name: metrics-server namespace: kube-system --- 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: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: system:metrics-server rules: - apiGroups: - "" resources: - pods - nodes - nodes/stats - namespaces verbs: - get - list - watch - apiGroups: - "extensions" resources: - deployments 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 --- apiVersion: apiregistration.k8s.io/v1beta1 kind: APIService metadata: name: v1beta1.metrics.k8s.io spec: service: name: metrics-server namespace: kube-system group: metrics.k8s.io version: v1beta1 insecureSkipTLSVerify: true groupPriorityMinimum: 100 versionPriority: 100
--- apiVersion: v1 kind: Service metadata: name: metrics-server namespace: kube-system labels: kubernetes.io/name: "Metrics-server" spec: selector: k8s-app: metrics-server ports: - port: 443 protocol: TCP targetPort: 443
--- apiVersion: apps/v1beta2 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 containers: - name: metrics-server # image: gcr.io/google_containers/metrics-server-amd64:v0.2.1
          image: 144.202.127.156/google_containers/metrics-server-amd64:v0.2.1 imagePullPolicy: Always command: - /metrics-server - --source=kubernetes.summary_api:'' resources: requests: cpu: 20m memory: 200Mi limits: cpu: 100m memory: 500Mi

metrics-server.yml

 三、验证：

一、建立测试资源：
kubectl create -f nginx.yml

二、建立自动伸缩规则：
kubectl autoscale deployment nginx --cpu-percent=75 --min=2 --max=10
kubectl get hpa

NAME           REFERENCE                 TARGETS    MINPODS   MAXPODS   REPLICAS   AGE
bill-service   Deployment/bill-service   0% / 80%   5         10        5          2h
注：TARGETS出现 

三、测试是否生效（使用脚本测）：
python pressure-web.py
kubectl get hpa<unknown> / 80% 说明没有成功就得看metrics-server的日志和hpa的describe来查找缘由了。

apiVersion: v1 kind: Service metadata: name: nginx labels: app: nginx spec: ports: - port: 80 name: web selector: app: nginx --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: web spec: selector: matchLabels: app: nginx replicas: 3 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx resources: limits: cpu: 100m memory: 100Mi requests: cpu: 50m memory: 50Mi ports: - containerPort: 80 name: web

nginx-php.yml

import requests,time,threading url = "https://www.baidu.com" requests_timeout = 2


def get_response_time(url,count,ring): start_time = time.time() try: req_obj = requests.get(url,timeout=requests_timeout) except requests.exceptions.ReadTimeout as e: status = False else: status = True end_time = time.time() requests_time = end_time-start_time if status and (req_obj.status_code == requests.codes.ok) : requests_status = "OK"
    else: requests_status = "NO"
    print("第%s轮，第%s链接，请求用时（s）：%s，返回状态：%s"%(ring,count,requests_time,requests_status)) if __name__ == "__main__": '''在规定超时时间内，11秒内处理不了100个请求，请求就会累积，一直拖垮''' ring = 1
    while True: for count in range(100): t = threading.Thread(target=get_response_time,args=(url,count,ring)) time.sleep(0.01) t.start() time.sleep(10) ring += 1
        print("第%s轮开始"%ring)

pressure-web.py