记录java应用部署到k8s中_sed: can't move '/etc/resolv.confoiemka' to '/etc/

最近任务是把之前运行在docker里的自己写的java镜像部署到k8
s中，踩了一些坑，记录如下：
1.在写yaml文件时指定非shell命令而是一些命令行的时候要加上bash -c否则会报错：exec:“bash”:executable file not found in $PATH
2.如果要操作容器里/etc/hosts这样的文件，会报错： can’t move ‘/etc/resolv.conf73UqmG’ to ‘/etc/resolv.conf’: Device or resource busy，一定要记着操作方式，如果用sed命令会报错，因为sed命令会重新拷贝一份，具体参考：https://www.cnblogs.com/xuxinkun/p/7116737.html
最后通过bash -c的方式往hosts文件里加域名：(因为openjdk:8-jdk-alpine只有sh没有bash，所以使用sh）

apiVersion: apps/v1
kind: Deployment
metadata:
  name: java-data-store
  labels:
    app: java-data-store
spec:
  replicas: 1
  selector:
    matchLabels:
      app: java-data-store
  template:
    metadata:
      labels:
        app: java-data-store
    spec:
      containers:
      - name: java-data-store
        image: harbor:9501/library/openjdk:8-jdk-alpine
        imagePullPolicy: IfNotPresent
        ports:
        - name: data-store
          containerPort: 40502
        command: ["java", "-jar","jars/data-store.jar"]
        lifecycle:
          postStart:
            exec:
              command: ["sh","-c","echo 'xx.xx.xx.xx xxxx' >> /etc/hosts"]
        env:
        volumeMounts:
        - name: jar-vol
          mountPath: /jars
        - name: log-vol
          mountPath: app/logs
      restartPolicy: Always
      volumes:
      - name: jar-vol
        glusterfs:
          endpoints: glusterfs-cluster
          path: gv0/userapp/java-apps/jars
          readOnly: false
      - name: log-vol
        glusterfs:
          endpoints: glusterfs-cluster
          path: gv0/userapp/java-apps/logs/data-store
          readOnly: false
---
apiVersion: v1
kind: Service
metadata:
  name: java-data-store
spec:
  selector:
    app: java-data-store
  ports:
    - port: 40502
      targetPort: 40502
      nodePort: 30203
  type: NodePort
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