Pod-hook:

postStart:

1.

$ $ vim preStart-hook.yaml

---

apiVersion: v1

kind: Pod

metadata:

  name: hook-demo1

  labels:

    app: hook

spec:

  containers:

  - name: hook-demo1

    image: nginx

    ports:

    - name: webport

      containerPort: 80

    lifecycle:

      postStart:

        exec:

          command: ["/bin/sh", "-c", "echo Hello from the postStart Hander > /usr/share/message"]

          

$ kubectl exec hook-demo1  -i -t  /bin/bash          

preStop:

2.强制删除

$ kubectl delete pod hook-demo1 --force --grace-period=0

$ vim preStop-hook.yaml

---

apiVersion: v1

kind: Pod

metadata:

  name: hook-demo2

  labels:

    app: hook

spec:

  containers:

  - name: hook-demo2

    image: nginx

    ports:

    - name: webport

      containerPort: 80

    volumeMounts:

    - name: message

      mountPath: /usr/share

    lifecycle:

      preStop:

        exec:

          command: ["/bin/sh", "-c", "echo Hello from the postStop Hander > /usr/share/message"]

  volumes:

  - name: message

    hostPath:

      path: /tmp

普通的pod是不能被调度到master节点上面来的

存活探针:

liveness probe

$ vim liveness-exec.yaml

---

apiVersion: v1

kind: Pode

metadata:

  name: liveness-exec

  labels:

    app: liveness

spec:

  containers:

  - name: liveness

    images: busybox

    args:

    - /bin/sh

    - -c

    - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600

    livenessProbe:

      exec:

        command:

        - cat

        - /tmp/healthy

      initialDelaySeconds: 5

      periodSeconds: 5

      

初始化容器-initcontainer

$ vim initpod1.yaml

---

apiVersion: v1

kind: Pod

metadata:

  name: init-pod

  labels:

    app: init

spec:

  initContainers:

  - name: init-myservice

    image: busybox

    command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done;']

  - name:

    image: busybox

    command: ['sh', '-c', 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;']

  containers:

  - name: main-container

    image: busybox

    command: ['sh', '-c', 'echo The app is running! && sleep 3600']