运行 docker 在 Kubernetes 中使用不同命令的容器

Question

我想首先从 GitLab 执行 app:rake db:setup 以便可以初始化数据库。

来自我的 GitLab YAML 的片段 (init-db.yaml)

...
        name: gitlab
        image: docker.artifactory.abc.net/sameersbn/gitlab:9.3.9
        command:
        - app:rake db:setup
        volumeMounts:
        - name: gfs-vol-gitlab
          mountPath: /home/git/data
        ports:
        - containerPort: 443
        resources: {}
      volumes:
...

但是当我检查 pod 的状态时，我收到以下错误消息：

...
Command:
      app:rake db:setup
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       ContainerCannotRun
      Message:      invalid header field value "oci runtime error: container_linux.go:247: starting container process caused \"exec: \\"app:rake db:setup\\": executable file not found in $PATH\"\n"
...

来自 Dockerfile

的片段

...
...
EXPOSE 22/tcp 80/tcp 443/tcp

VOLUME ["${GITLAB_DATA_DIR}", "${GITLAB_LOG_DIR}"]
WORKDIR ${GITLAB_INSTALL_DIR}
ENTRYPOINT ["/sbin/entrypoint.sh"]
CMD ["app:start"]

来自 entrypoint.sh

的片段

...
...
case  in
  app:init|app:start|app:sanitize|app:rake)
...

更新：当我运行这个：

command:
        - "app:rake" 
        - "db:setup"

我得到：

to open log file "/var/log/pods/5b604971-b5ac-11e7-9ee5-021bfed3b32a/gitlab_0.log": open /var/log/pods/5b604971-b5ac-11e7-9ee5-021bfed3b32a/gitlab_0.log: no such file or directory

当我尝试这个时：

command:
        - "/bin/sh"
        args:
        - "-c"
        - "app:rake db:setup"

我得到：/bin/sh: 1: app:rake: not found

此 link 描述了运行ning app:rake db:setup 设置数据库的命令。

我之前在 Kubernetes 之外尝试过运行执行此命令，使用下面显示的代码它运行良好：

docker run --name gitlab -it --rm \
    --link gitlab-postgresql:postgresql --link gitlab-redis:redisio \
    --publish 443:443 --publish 80:80 \
    --env 'GITLAB_PORT=80' \
    --env 'GITLAB_SECRETS_DB_KEY_BASE=64_bit_key_A' \
    --env 'GITLAB_SECRETS_SECRET_KEY_BASE=64_bit_key_B' \
    --env 'GITLAB_SECRETS_OTP_KEY_BASE=64_bit_key_C' \
    --volume /srv/docker/gitlab/gitlab:/home/git/data \
    sameersbn/gitlab:9.3.9 app:rake db:setup

UPDATE_1:

$ kubectl describe pod gitlab-1108406018-3lvh7
Events:
  Type     Reason                 Age                From                      Message
  ----     ------                 ----               ----                      -------
  Normal   Scheduled              18m                default-scheduler         Successfully assigned gitlab-1108406018-3lvh7 to rancher-a
  Normal   SuccessfulMountVolume  18m                kubelet, rancher-a  MountVolume.SetUp succeeded for volume "default-token-qv8dm"
  Normal   SuccessfulMountVolume  18m                kubelet, rancher-a  MountVolume.SetUp succeeded for volume "pvc-304c48a5-b430-11e7-9ee5-021bfed3b32a"
  Normal   Pulling                17m                kubelet, rancher-a  pulling image "docker.artifactory.abc.net/sameersbn/gitlab:9.3.9"
  Normal   Pulled                 16m                kubelet, rancher-a  Successfully pulled image "docker.artifactory.abc.net/sameersbn/gitlab:9.3.9"
  Normal   Pulled                 2m (x7 over 16m)   kubelet, rancher-a  Container image "docker.artifactory.abc.net/sameersbn/gitlab:9.3.9" already present on machine
  Normal   Created                2m (x8 over 16m)   kubelet, rancher-a  Created container
  Normal   Started                2m (x8 over 16m)   kubelet, rancher-a  Started container
  Warning  BackOff                8s (x56 over 15m)  kubelet, rancher-a  Back-off restarting failed container
  Warning  FailedSync             8s (x56 over 15m)  kubelet, rancher-a  Error syncing pod

Answer 1

更新： 这不是正确的答案。请参考Andy Shinn的回答。

每个命令都应该是命令数组中的一个项目。因为你想执行两个命令，试试这个：

...
        name: gitlab
        image: docker.artifactory.abc.net/sameersbn/gitlab:9.3.9
        command:
        - "app:rake" 
        - "db:setup"
        volumeMounts:
        - name: gfs-vol-gitlab
          mountPath: /home/git/data
        ports:
        - containerPort: 443
        resources: {}
      volumes:
...

您还可以使用 args 参数在一行中写入 app:rake db:setup 命令对（基本上是在 shell 上下文中将命令强制为运行） :

...
        name: gitlab
        image: docker.artifactory.abc.net/sameersbn/gitlab:9.3.9
        command:
        - "/bin/sh"
        args:
        - "-c"
        - "app:rake db:setup"
        volumeMounts:
        - name: gfs-vol-gitlab
          mountPath: /home/git/data
        ports:
        - containerPort: 443
        resources: {}
      volumes:
...

Answer 2

我认为这可能只是 Pod 规范的混淆。在 Kubernetes 中，command 相当于 Docker ENTRYPOINT，args 相当于 CMD。在你的情况下，我想你想要：

...
        name: gitlab
        image: docker.artifactory.abc.net/sameersbn/gitlab:9.3.9
        command:
        - "/sbin/entrypoint.sh"
        args:
        - "app:rake"
        - "db:setup"
        volumeMounts:
        - name: gfs-vol-gitlab
          mountPath: /home/git/data
        ports:
        - containerPort: 443
        resources: {}
      volumes:
...

运行 docker 在 Kubernetes 中使用不同命令的容器

Run docker container with a different command in Kubernetes

gitlab

docker

kubernetes

gitlab-omnibus