kubernetes 安装新版metrics-server

由于晚上的文档是有些旧，所以我踩坑写了个新的，内容不是特别详细,但是足够将pod跑起来

网上的文档是旧的版本，不适应现在新的版本

 

# git clone https://github.com/kubernetes-incubator/metrics-server
# cd metrics-server/deploy/1.8+/

这是之前的部署方式

 

 

更新以后可以使用一条yaml 直接部署
https://github.com/kubernetes-sigs/metrics-server/releases
在这个链接下面,直接下载对应的yaml即可
kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.4.1/components.yaml

建议先wget 对其修改以后再进行apply

下载这个yaml以后打开
修改其中的四行

        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname（这行其实不改也可以,）

        - --kubelet-preferred-address-types=InternalIP
        - --kubelet-insecure-tls

       还有一个跟container同级的hostNetwork: true别忘记加了

整个yaml只修改这几个位置

        willdockerhub/metrics-server:v0.4.1 （image建议换成这个，如果可以访问外网当我没说,这个镜像在hub.docker.com是及时更新的,）
#下面是官方文档对这两个参数的说明
        --kubelet-preferred-address-types - The priority of node address types used when determining an address for connecting to a particular node (default [Hostname,InternalDNS,InternalIP,ExternalDNS,ExternalIP])
        --kubelet-insecure-tls - Do not verify the CA of serving certificates presented by Kubelets. For testing purposes only.

修改完这两行以后，就apply这个yaml就可以了

然后kubectl get pods -n kube-system 就可以查看到metrics-server的pod了

注意: kubeadm 方式部署的话，在/etc/kubernetes/manifests/kube-apiserver.yaml修改
增加这一句话     - --enable-aggregator-routing=true 开启路由

二进制部署的话

`
# vi /opt/kubernetes/cfg/kube-apiserver.conf
...
--requestheader-client-ca-file=/opt/kubernetes/ssl/ca.pem \
--proxy-client-cert-file=/opt/kubernetes/ssl/server.pem \
--proxy-client-key-file=/opt/kubernetes/ssl/server-key.pem \
--requestheader-allowed-names=kubernetes \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-group-headers=X-Remote-Group \
--requestheader-username-headers=X-Remote-User \
--enable-aggregator-routing=true \
...

写的很简单，但是非常实用

如果kubectl top nodes 失败的话，首先看下metrics-server的日志，若果没有报错的话那就看下kube-apiserver的日志，这两个肯定有一个是报错的

基本上这块就是权限控制的问题导致的，如果搞不定的话，那就kubectl delete -f 刚才下载的yaml文件，然后看下面的链接，百分之百能搞定

http://www.mydlq.club/article/77/

[root@k1 file]# cat components.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
    rbac.authorization.k8s.io/aggregate-to-admin: "true"
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
    rbac.authorization.k8s.io/aggregate-to-view: "true"
  name: system:aggregated-metrics-reader
rules:
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  - nodes/stats
  - namespaces
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  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: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  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: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  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: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: https
  selector:
    k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      hostNetwork: true
      containers:
      - args:
        - --cert-dir=/tmp
        - --kubelet-insecure-tls
        - --secure-port=4443
        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
        - --kubelet-use-node-status-port
        image: willdockerhub/metrics-server:v0.4.1
        imagePullPolicy: Always
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /livez
            port: https
            scheme: HTTPS
          periodSeconds: 10
        name: metrics-server
        ports:
        - containerPort: 4443
          name: https
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /readyz
            port: https
            scheme: HTTPS
          periodSeconds: 10
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
        volumeMounts:
        - mountPath: /tmp
          name: tmp-dir
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      volumes:
      - emptyDir: {}
        name: tmp-dir
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  labels:
    k8s-app: metrics-server
  name: v1beta1.metrics.k8s.io
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: metrics-server
    namespace: kube-system
  version: v1beta1
  versionPriority: 100