docker - 持久存储 : How to mount a directory in Kubernetes?

Question

我知道在 Kubernetes 中您不想将 pod“绑定(bind)”到主机，但在某些情况下您可能需要这样做。

在我的特殊情况下，我有一个位于 block 存储上的数据库，该 block 存储安装在特定主机上。

我试图用 Kubernetes 完成的是相当于 Docker 中的绑定(bind)挂载。我想在pod中指定我需要挂载的host上的目录，类似这样:

/mnt/BTC_2:/root/.bitcoin:rw

如何指定我希望持久存储在节点/主机上的位置？这会是一个如下所示的 hostPath 卷吗:

    volumeMounts:
    - mountPath: /root/.bitcoin
      name: test-volume
  volumes:
  - name: test-volume
    hostPath:
      # directory location on host
      path: /mnt/BTC_2

Answer 1

I want to specify the directory on the host that I need mounted in the pod

应该是documented here

A hostPath volume mounts a file or directory from the host node’s filesystem into your pod. This is not something that most Pods will need, but it offers a powerful escape hatch for some applications.

警告:

The files or directories created on the underlying hosts are only writable by root. You either need to run your process as root in a privileged container or modify the file permissions on the host to be able to write to a hostPath volume

  volumes:
  - name: test-volume
    hostPath:
      # directory location on host
      path: /data
      # this field is optional
      type: Directory