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kubernetesgoogle-cloud-run

subPathExpr in Google Cloud Run

Requirement is to dynamically create a subdirectory based on pod uid and mount it inside the container.

env:
  - name: METADATA_UID
    valueFrom:
      fieldRef:
        fieldPath: metadata.uid

Since init containers are not supported in Google Cloud Run, we will have to achieve this by running a side car and wait in main container until the directory is created.

mkdir -p /shared_storage_root/POD_$METADATA_UID/logs/XYZ

and mount inside container

- name: log-efs
    mountPath: /home/app/logs
    subPathExpr: POD_$METADATA_UID/logs/XYZ

is subPathExpr feature supported by Google Cloud Run? I have seen post which suggests that we can apply a full k8s manifest generated by helm in Google Cloud Run, so does it mean it will be supported at runtime?

Solution

  • subPathExpr is not supported by Cloud Run. While you can use Helm to generate configs that are compatible with Cloud Run, not all Kubernetes configs are compatible with it.