chown:/var/lib/postgresql/data/postgresql.conf:只读文件系统

问题描述

我通过遵循.

I solved a permission issue when mounting /var/lib/postgresql/data by following this answer with initContainers.

现在，我正在尝试将 postgresql.conf 挂载为卷，并且遇到了类似的许可问题，该问题引发了 chown:/var/lib/postgresql/data/postgresql.conf:只读文件系统.

Now I'm trying to mount postgresql.conf as a volume, and I'm running into a similar permissioning issue that throws chown: /var/lib/postgresql/data/postgresql.conf: Read-only file system.

我可能会缺少什么?我已经尝试了很多运气不尽相同的变化.

What could I be missing? I've tried a bunch of different variations with little luck.

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: postgres
  labels:
    app: postgres
spec:
  serviceName: postgres
  replicas: 1
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: postgres
    spec:
      terminationGracePeriodSeconds: 10
      initContainers:
      - name: chmod-er
        image: busybox:latest
        command:
        - /bin/chown
        - -R
        - '0'
        - /var/lib/postgresql/data
        volumeMounts:
        - name: postgredb
          mountPath: /var/lib/postgresql/data
        - name: pg-config
          mountPath: /var/lib/postgresql/data/postgresql.conf
          subPath: postgresql.conf
      containers:
        - name: postgres
          image: mdillon/postgis:10-alpine
          ports:
            - containerPort: 5432
          volumeMounts:
            - name: postgredb
              mountPath: /var/lib/postgresql/data
              subPath: data
            - name: pg-config
              mountPath: /var/lib/postgresql/data/postgresql.conf
              subPath: postgresql.conf
      volumes:
        - name: postgredb
          persistentVolumeClaim:
            claimName: postgres-pvc
        - name: pg-config
          configMap:
            name: pg-config
            items:
              - key: postgresql.conf
                path: postgresql.conf

推荐答案

从kubernetes 1.8开始，configmap只读安装，摘自CHANGELOG-1.8.md:

From kubernetes 1.8 on, configmap is mounted readonly, excerpt from the CHANGELOG-1.8.md:

如果要更改从configmap挂载的文件，可以将其复制到另一个目录，然后进行更新.

If you want to change the file that mounted from the configmap, you can copy it to another directory, then update it.

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