服务器必须由拥有数据目录的用户启动

Question

我正在尝试为在 Kubernetes 上运行的 PostgreSQL docker 实例获取一些持久存储。但是，吊舱失败了

FATAL:  data directory "/var/lib/postgresql/data" has wrong ownership
HINT:  The server must be started by the user that owns the data directory. 

这是 NFS 配置：

% exportfs -v
/srv/nfs/postgresql/postgres-registry
        kubehost*.example.com(rw,wdelay,insecure,no_root_squash,no_subtree_check,sec=sys,rw,no_root_squash,no_all_squash)
$ ls -ldn /srv/nfs/postgresql/postgres-registry
drwxrwxrwx. 3 999 999 4096 Jul 24 15:02 /srv/nfs/postgresql/postgres-registry
$ ls -ln /srv/nfs/postgresql/postgres-registry
total 4
drwx------. 2 999 999 4096 Jul 25 08:36 pgdata

来自 pod 的完整日志：

2019-07-25T07:32:50.617532000Z The files belonging to this database system will be owned by user "postgres".
2019-07-25T07:32:50.618113000Z This user must also own the server process.
2019-07-25T07:32:50.619048000Z The database cluster will be initialized with locale "en_US.utf8".
2019-07-25T07:32:50.619496000Z The default database encoding has accordingly been set to "UTF8".
2019-07-25T07:32:50.619943000Z The default text search configuration will be set to "english".
2019-07-25T07:32:50.620826000Z Data page checksums are disabled.
2019-07-25T07:32:50.621697000Z fixing permissions on existing directory /var/lib/postgresql/data ... ok
2019-07-25T07:32:50.647445000Z creating subdirectories ... ok
2019-07-25T07:32:50.765065000Z selecting default max_connections ... 20
2019-07-25T07:32:51.035710000Z selecting default shared_buffers ... 400kB
2019-07-25T07:32:51.062039000Z selecting default timezone ... Etc/UTC
2019-07-25T07:32:51.062828000Z selecting dynamic shared memory implementation ... posix
2019-07-25T07:32:51.218995000Z creating configuration files ... ok
2019-07-25T07:32:51.252788000Z 2019-07-25 07:32:51.251 UTC [79] FATAL:  data directory "/var/lib/postgresql/data" has wrong ownership
2019-07-25T07:32:51.253339000Z 2019-07-25 07:32:51.251 UTC [79] HINT:  The server must be started by the user that owns the data directory.
2019-07-25T07:32:51.262238000Z child process exited with exit code 1
2019-07-25T07:32:51.263194000Z initdb: removing contents of data directory "/var/lib/postgresql/data"
2019-07-25T07:32:51.380205000Z running bootstrap script ... 

部署具有以下内容：

  securityContext:
    runAsUser: 999
    supplementalGroups: [999,1000]
    fsGroup: 999

我究竟做错了什么？

编辑：添加了 storage.yaml 文件：

kind: PersistentVolume
apiVersion: v1
metadata:
  name: postgres-registry-pv-volume
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  nfs:
    server: 192.168.3.7
    path: /srv/nfs/postgresql/postgres-registry
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: postgres-registry-pv-claim
  labels:
    app: postgres-registry
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi

编辑：以及完整的部署：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: postgres-registry
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: postgres-registry
    spec:
      securityContext:
        runAsUser: 999
        supplementalGroups: [999,1000]
        fsGroup: 999
      containers:
        - name: postgres-registry
          image: postgres:latest
          imagePullPolicy: "IfNotPresent"
          ports:
            - containerPort: 5432
          env:
              - name: POSTGRES_DB
                value: postgresdb
              - name: POSTGRES_USER
                value: postgres
              - name: POSTGRES_PASSWORD
                value: Sekret
          volumeMounts:
            - mountPath: /var/lib/postgresql/data
              subPath: "pgdata"
              name: postgredb-registry-persistent-storage
      volumes:
        - name: postgredb-registry-persistent-storage
          persistentVolumeClaim:
            claimName: postgres-registry-pv-claim

更多调试添加：

command: ["/bin/bash", "-c"]
args:["id -u; ls -ldn /var/lib/postgresql/data"]

哪个返回：

999
drwx------. 2 99 99 4096 Jul 25 09:11 /var/lib/postgresql/data

显然，UID/GID 是错误的。为什么？

即使有 Jakub Bujny 建议的解决方法，我还是明白了：

 2019-07-25T09:32:08.734807000Z The files belonging to this database system will be owned by user "postgres".
2019-07-25T09:32:08.735335000Z This user must also own the server process.
2019-07-25T09:32:08.736976000Z The database cluster will be initialized with locale "en_US.utf8".
2019-07-25T09:32:08.737416000Z The default database encoding has accordingly been set to "UTF8".
2019-07-25T09:32:08.737882000Z The default text search configuration will be set to "english".
2019-07-25T09:32:08.738754000Z Data page checksums are disabled.
2019-07-25T09:32:08.739648000Z fixing permissions on existing directory /var/lib/postgresql/data ... ok
2019-07-25T09:32:08.766606000Z creating subdirectories ... ok
2019-07-25T09:32:08.852381000Z selecting default max_connections ... 20
2019-07-25T09:32:09.119031000Z selecting default shared_buffers ... 400kB
2019-07-25T09:32:09.145069000Z selecting default timezone ... Etc/UTC
2019-07-25T09:32:09.145730000Z selecting dynamic shared memory implementation ... posix
2019-07-25T09:32:09.168161000Z creating configuration files ... ok
2019-07-25T09:32:09.200134000Z 2019-07-25 09:32:09.199 UTC [70] FATAL:  data directory "/var/lib/postgresql/data" has wrong ownership
2019-07-25T09:32:09.200715000Z 2019-07-25 09:32:09.199 UTC [70] HINT:  The server must be started by the user that owns the data directory.
2019-07-25T09:32:09.208849000Z child process exited with exit code 1
2019-07-25T09:32:09.209316000Z initdb: removing contents of data directory "/var/lib/postgresql/data"
2019-07-25T09:32:09.274741000Z running bootstrap script ... 999
2019-07-25T09:32:09.278124000Z drwx------. 2 99 99 4096 Jul 25 09:32 /var/lib/postgresql/data 

Answer 1

我无法解释为什么这两个 ID 不同，但作为解决方法，我会尝试使用以下命令覆盖 postgres 的入口点

command: ["/bin/bash", "-c"]
args: ["chown -R 999:999 /var/lib/postgresql/data && ./docker-entrypoint.sh postgres"]