Support generic ephemeral volumes with volumeClaimTemplate on pods/deployments

[willhughes-au]

Description

As of Kubernetes 1.23, deployments can have generic ephemeral volumes by using volumeClaimTemplate.

Currently it does not appear to be possible to configure this within either a kubernetes_pod_v1 or kubernetes_deployment_v1 resource. Both resources should ephemeral volumes like this available.

Potential Terraform Configuration

This example is just for a pod resource, as per the example from the kubernetes documentation

resource "kubernetes_pod_v1" "name" {
  spec { 
    volume {
      name =  "scratch-volume"
      ephemeral {
        volume_claim_template {
          spec {
            access_modes = [ "ReadWriteOnce" ]
            resources {
              requests {
                storage = "10Gi"
              }
            }
            storage_class_name = "scratch-storage-class"
            volume_mode = "FileSystem"
          }
        }
    }
  }
}

References

Kubernetes ephemeral volumes documentation: https://kubernetes.io/docs/concepts/storage/ephemeral-volumes/#generic-ephemeral-volumes

Community Note

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[willhughes-au]

@BBBmau The linked issue #2183 only seems to resolve ephemeral volumes for pod spec. I don't believe it will work for deployments still. Also possibly stateful sets, cronjobs/jobs, etc.

Could you please re-open this issue if it's not fixed for those, too?

[jbg]

@BBBmau The linked issue #2183 only seems to resolve ephemeral volumes for pod spec. I don't believe it will work for deployments still. Also possibly stateful sets, cronjobs/jobs, etc.

Could you please re-open this issue if it's not fixed for those, too?

The PodSpec within a deployment, statefulset, job, daemonset etc is the same object, and the code for PodSpec isn't duplicated everywhere a PodSpec is used, so it should fix it everywhere.