docker - 在Kubernetes中使用其他命令运行Docker容器

Question

我想最初从GitLab执行app:rake db:setup，以便可以初始化数据库。

我的GitLab YAML的代码段(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，出现以下错误消息:

...
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"
...

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"]

entrypoint.sh的片段

...
...
case ${1} 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:

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 app:rake db:setup命令来设置数据库。

我之前尝试过在Kubernetes外部运行此命令，并且使用下面显示的代码可以正常运行:

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

我认为这可能只是Pod规范的混淆。在Kubernetes中，command与Docker ENTRYPOINT等效，而args与CMD等效。就您而言，我想您想要:

...
        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:
...