用Kubernetes中的不同命令運行碼頭容器

Question

我想從GitLab最初執行app:rake db:setup，因此可以初始化db。

從

摘錄我GitLab YAML（NIT-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，當我檢查莢的狀態，我得到了以下錯誤消息：

... 
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" 
... 

從Dockerfile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"] 

段從entrypoint.sh

... 
... 
case ${1} in 
    app:init|app:start|app:sanitize|app:rake) 
... 

UPDATE： 當我運行此：

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 

當我試試這個：

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

我得到：/bin/sh: 1: app:rake: not found

這個link描述了運行app:rake db:setup命令來建立數據庫。

我先前試圖運行Kubernetes超出這個命令，它能正常工作使用的代碼如下所示：

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

我認爲這可能只是Pod規範的混合。在Kubernetes中，command等效於Docker ENTRYPOINT，而args等效於CMD。在你的情況，我認爲你想要：

... 
     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: 
... 

Answer 2

UPDATE：這不是正確的答案。請參閱Andy Shinn的回答。

---

每個命令應該是命令數組內的一個項目。當您要執行兩個命令，試試這個：

... 
     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: 
... 

您也可以使用args參數來寫你的app:rake db:setup命令對在同一行（由基本強迫命令，在shell上下文中運行）：

... 
     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: 
...