Add support for subPathExpr for VolumeMounts in a container

[s-annamalai-fetch]

Description

subPathExpr is pretty handy if you want to use values from downwardAPI and use them to mount a specific volume from the host.

Potential Terraform Configuration

resource "kubernetes_deployment" "deployment" {
  ...
          volume_mount {
            name             = "data"
            mount_path       = "/data"
            //sub_path_expr  = "$(POD_NAME)"
          }
  ...
}

References

https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath-expanded-environment

Community Note

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[sheneska]

Hi @s-annamalai-fetch, thanks for opening this issue. Our team will be looking more into this!

[david-garcia-garcia]

There's been a neglected PR for almost 4 years that seems to provide what has been asked for in this issue:

#925

It seems to be broken though due to a bad merge.

[BBBmau]

@david-garcia-garcia unless the author of the PR is open to rebasing, it would be best if a new PR was made to get it merged. Interested in opening one?

[jk-f5]

I re-implemented this in #2622 but haven't been able to get traction.