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Chapter 7. Requesting persistent storage for workspaces

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OpenShift Dev Spaces workspaces and workspace data are ephemeral and are lost when the workspace stops.

To preserve the workspace state in persistent storage while the workspace is stopped, request a Kubernetes PersistentVolume (PV) for the Dev Workspace containers in the OpenShift cluster of your organization’s OpenShift Dev Spaces instance.

You can request a PV by using the devfile or a Kubernetes PersistentVolumeClaim (PVC).

An example of a PV is the /projects/ directory of a workspace, which is mounted by default for non-ephemeral workspaces.

Persistent Volumes come at a cost: attaching a persistent volume slows workspace startup.

Warning

Starting another, concurrently running workspace with a ReadWriteOnce PV might fail.

7.1. Requesting persistent storage in a devfile

When a workspace requires its own persistent storage, request a PersistentVolume (PV) in the devfile, and OpenShift Dev Spaces will automatically manage the necessary PersistentVolumeClaims.

Prerequisites

  • You have not started the workspace.

Procedure

  1. Add a volume component in the devfile:

    ...
    components:
      ...
      - name: <chosen_volume_name>
        volume:
          size: <requested_volume_size>G
      ...
  2. Add a volumeMount for the relevant container in the devfile:

    ...
    components:
      - name: ...
        container:
          ...
          volumeMounts:
            - name: <chosen_volume_name_from_previous_step>
              path: <path_where_to_mount_the_PV>
          ...

Example 7.1. A devfile that provisions a PV for a workspace to a container

When a workspace is started with the following devfile, the cache PV is provisioned to the golang container in the ./cache container path:

schemaVersion: 2.1.0
metadata:
  name: mydevfile
components:
  - name: golang
    container:
      image: golang
      memoryLimit: 512Mi
      mountSources: true
      command: ['sleep', 'infinity']
      volumeMounts:
        - name: cache
          path: /.cache
  - name: cache
    volume:
      size: 2Gi

7.2. Requesting persistent storage in a PVC

You can opt to apply a PersistentVolumeClaim (PVC) to request a PersistentVolume (PV) for your workspaces in the following cases:

  • Not all developers of the project need the PV.
  • The PV lifecycle goes beyond the lifecycle of a single workspace.
  • The data included in the PV are shared across workspaces.
Tip

You can apply a PVC to the Dev Workspace containers even if the workspace is ephemeral and its devfile contains the controller.devfile.io/storage-type: ephemeral attribute.

Prerequisites

  • You have not started the workspace.
  • An active oc session with administrative permissions to the destination OpenShift cluster. See Getting started with the CLI.
  • A PVC is created in your user project to mount to all Dev Workspace containers.

Procedure

  1. Add the controller.devfile.io/mount-to-devworkspace: true label to the PVC.

    $ oc label persistentvolumeclaim <PVC_name> \ controller.devfile.io/mount-to-devworkspace=true
  2. Optional: Use the annotations to configure how the PVC is mounted:

    Table 7.1. Optional annotations
    AnnotationDescription

    controller.devfile.io/mount-path:

    The mount path for the PVC.

    Defaults to /tmp/<PVC_name>.

    controller.devfile.io/read-only:

    Set to 'true' or 'false' to specify whether the PVC is to be mounted as read-only.

    Defaults to 'false', resulting in the PVC mounted as read-write.

Example 7.2. Mounting a read-only PVC

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: <pvc_name>
  labels:
    controller.devfile.io/mount-to-devworkspace: 'true'
  annotations:
    controller.devfile.io/mount-path: </example/directory> 1
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi 2
  volumeName: <pv_name>
  storageClassName: manual
  volumeMode: Filesystem
1
The mounted PV is available at </example/directory> in the workspace.
2
Example size value of the requested storage.
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