0013 Restore Approach

0013 Restore Approach#

Context and Problem Statement#

Restoring volumes from a backup needs a solution so that the deployment of the application is delayed until the restore did happen.

How should this best be implemented?

Considered Options#

  • Use Helm and its hook mechanism.

  • Use a custom init container.

  • Use a Job together with the dependency handling of Flux.

  • Switch to a different storage which provides snapshots and clones, so that the Volume Provisioner of Volsync can be used.

Decision Outcome#

The dependency handling of Flux does wait until Job did complete.

The waiting for a specific status of the ReplicationDestination object is implemented in a Job by using kubectl. The volume setup and restore is installed via a dedicated Flux Kostomization so that the dependency handling of Flux can be leveraged.