将子目录与 kubernetes gitRepo 卷挂载结合使用

Question

以下片段来自 kubernetes 官方文档（http://kubernetes.io/docs/user-guide/volumes/#gitrepo）：

apiVersion: v1
kind: Pod
metadata:
  name: server
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /mypath
      name: git-volume
  volumes:
  - name: git-volume
    gitRepo:
      repository: "git@somewhere:me/my-git-repository.git"
      revision: "22f1d8406d464b0c0874075539c1f2e96c253775"

上面的代码将在 /mypath 的容器内安装完整的 git 存储库。有没有办法只将 git repo 内的特定子目录挂载在 /mypath 容器内？

Answer 1

是的，有一种方法可以做到。请参阅以下示例。我有git repo，它有子目录configs。

这是我正在使用的 pod 文件：

apiVersion: v1
kind: Pod
metadata:
  name: server
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /mypath/
      name: git-volume
      subPath: "hitcounter/configs"
  volumes:
  - name: git-volume
    gitRepo:
      repository: "https://github.com/surajssd/hitcounter"
      revision: "9fd11822b822c94853b1c74ceb53adb8e1d2cfc8"

请注意中subPath的字段。您可以在此处指定要在容器内安装的卷的哪个子目录。containersvolumeMounts/mypath

文档说：

$ kubectl explain pod.spec.containers.volumeMounts.subPath
FIELD: subPath <string>

DESCRIPTION:
     Path within the volume from which the container's volume should be mounted.
     Defaults to "" (volume's root).

或者

像这样创建 pod 配置文件

apiVersion: v1
kind: Pod
metadata:
  name: server
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /mypath/
      name: git-volume
      subPath: "configs"
  volumes:
  - name: git-volume
    gitRepo:
      repository: "https://github.com/surajssd/hitcounter"
      revision: "9fd11822b822c94853b1c74ceb53adb8e1d2cfc8"
      directory: "."

这里的区别是我已经指定directory: "."这确保挂载点将/mypath成为 git repo 并且subPath: "configs"由于没有额外的目录而发生了变化hitcounter。

$ kubectl explain pod.spec.volumes.gitRepo.directory
FIELD: directory <string>

DESCRIPTION:
     Target directory name. Must not contain or start with '..'.  If '.' is
     supplied, the volume directory will be the git repository.  Otherwise, if
     specified, the volume will contain the git repository in the subdirectory
     with the given name.

华泰