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install-metric-server.md

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依赖

  • k8s 1.8+

安装prometheus监控

使用 prometheus-operator安装prometheus

git clone https://github.com/coreos/prometheus-operator
cd prometheus-operator
kubectl apply -f ./contrib/kube-prometheus/manifests/

访问prom ui查看指标

证书生成

生成验证请求客户端身份的根证书(亦可复用kubernetes的证书和ca，未测试)

cat <<EOF > front-proxy-ca-csr.json
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    }
}
EOF
cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare front-proxy-ca

生成证明apiserver身份的客户端证书（或者其它聚合器）

cat <<EOF > front-proxy-client-csr.json
{
    "CN": "front-proxy-client",
    "key": {
        "algo": "rsa",
        "size": 2048
    }
}
EOF

cfssl gencert \
  -ca=front-proxy-ca.pem \
  -ca-key=front-proxy-ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  front-proxy-client-csr.json | cfssljson -bare front-proxy-client

配置

kube-apiserver添加配置

--requestheader-client-ca-file=/etc/kubernetes/ssl/front-proxy-ca.pem --requestheader-allowed-names=front-proxy-client --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/front-proxy-client.pem --proxy-client-key-file=/etc/kubernetes/ssl/front-proxy-client-key.pem

kubectl delete configmap extension-apiserver-authentication  -n kube-system

service kube-apiserver restart

不重启apiserve需要以下操作

scp /etc/kubernetes/ssl/front-proxy-ca.pem xxx:/etc/kubernetes/ssl/front-proxy-ca.pem

修改metrics-server-deployment.yaml 指定根证书

        volumeMounts:
        - mountPath: /etc/kubernetes/ssl
          name: ca
      volumes:
      - name: ca
        hostPath:
          path: /etc/kubernetes/ssl

controller-manager添加配置

--horizontal-pod-autoscaler-use-rest-clients=true

metrics-server

安装

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

验证配置

#查看node指标
kubectl get --raw "/apis/metrics.k8s.io/v1beta1/nodes" | jq .
#查看pod指标
kubectl get --raw "/apis/metrics.k8s.io/v1beta1/pods" | jq .

验证hpa

创建podinfo deployment

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: podinfo
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: podinfo
      annotations:
        prometheus.io/scrape: 'true'
    spec:
      containers:
      - name: podinfod
        image: stefanprodan/podinfo:0.0.1
        imagePullPolicy: Always
        command:
          - ./podinfo
          - -port=9898
          - -logtostderr=true
          - -v=2
        volumeMounts:
          - name: metadata
            mountPath: /etc/podinfod/metadata
            readOnly: true
        ports:
        - containerPort: 9898
          protocol: TCP
        readinessProbe:
          httpGet:
            path: /readyz
            port: 9898
          initialDelaySeconds: 1
          periodSeconds: 2
          failureThreshold: 1
        livenessProbe:
          httpGet:
            path: /healthz
            port: 9898
          initialDelaySeconds: 1
          periodSeconds: 3
          failureThreshold: 2
        resources:
          requests:
            memory: "32Mi"
            cpu: "1m"
          limits:
            memory: "256Mi"
            cpu: "100m"
      volumes:
        - name: metadata
          downwardAPI:
            items:
              - path: "labels"
                fieldRef:
                  fieldPath: metadata.labels
              - path: "annotations"
                fieldRef:
                  fieldPath: metadata.annotations

创建podinfo hpa

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: podinfo
spec:
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: podinfo
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      targetAverageUtilization: 80
  - type: Resource
    resource:
      name: memory
      targetAverageValue: 200Mi

验证

查看是否获取到指标数据

kubectl get hpa

压力测试

ab -c 1000 -n 100000000000 http://podinfosvc:port/index.html

再次执kubectl get hpa行可以看到已经扩容

参考

  • 有关addon apiserver的认证机制参考文档
  • 有关从configmap获取配置的代码