CODEWITHSUNDEEP
dockerkubernetesdocker-composepersistent-storage
relik
relik

Reputation: 317

Persistent storage: How to mount a directory in Kubernetes?

I understand that in Kubernetes you don't want to "tie" a pod to a host, but in certain cases you might need to.

In my particular case I have a DB that lives on blockstorage which is mounted to a specific host.

What I am trying to accomplish with Kubernetes is the equivalent of a bind-mount in Docker. I want to specify the directory on the host that I need mounted in the pod, similar to this:

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

How do I specify the location of where I want my persistent storage to be on the node/host? Would this be a hostPath volume like the following:

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

Upvotes: 3

Views: 4050

Answers (1)

VonC
VonC

Reputation: 1323593

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

That should be 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.

Warning:

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

Upvotes: 1

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