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Chapter 8. Updating existing Kubernetes storage objects

To update existing objects to their latest version without recreating them, use storage version migration in MicroShift. By creating a StorageVersionMigration custom resource (CR), you request the Kube Storage Version Migrator embedded controller to handle the transition automatically.

Either you or a controller can create a StorageVersionMigration custom resource (CR) that requests a migration through the Migrator Controller.

To update stored data to the latest Kubernetes storage version, perform a storage migration.

The procedure shows an example of converting existing objects on the v1beta1 version to the current version, such as v1beta2, to ensure compatibility with the cluster APIs.

Procedure

  • Either you or any controller that has support for the StorageVersionMigration API must trigger a migration request. Use the following example request for reference:

    Example request

    apiVersion: migration.k8s.io/v1alpha1
kind: StorageVersionMigration
metadata:
  name: snapshot-v1
spec:
  resource:
    group: snapshot.storage.k8s.io
    resource: volumesnapshotclasses
    version: v1
    Copy to Clipboard Toggle word wrap

    where:

    resource.resource
    Specifies the plural name of the resource.
    resource.version
    Specifies the version to update to.

Verification

  • To monitor the progress of the update, review the status of the StorageVersionMigration custom resource (CR).
Note

A migration fails when you misname a group or resource. Incompatible versions between the previous and latest versions can also cause a migration to fail.

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