kubernetes之node 宕機，pod驅離問題解決

背景：

當node宕機時，希望該node節點上的pod能夠快速疏散到其他節點，並提供服務。測試發現，要等待5分鍾，上面的pod才會疏散。

網上介紹通過修改 /etc/kubernetes/manifests/kube-controller-manager.yaml

    - --node-monitor-grace-period=10s
    - --node-monitor-period=2s
    - --pod-eviction-timeout=10s

然而驗證不生效。

解決辦法：

通過修改deployment解決 

[root@node-01 testnginx]# kubectl describe pod  nginx-deployment|grep -i toleration -A 2
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>
--
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>

[root@node-01 testnginx]# cat test-nginx.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: my-nginx
    spec:
      tolerations:
      - key: "node.kubernetes.io/unreachable"
        operator: "Exists"
        effect: "NoExecute"
        tolerationSeconds: 2
      - key: "node.kubernetes.io/not-ready"
        operator: "Exists"
        effect: "NoExecute"
        tolerationSeconds: 2
      containers:
      - name: my-nginx
        image: nginx
        ports:
        - containerPort: 443

親測有效！！！