Understanding Stork in PX-Backup


Stork is a cloud native storage operator runtime scheduler plugin. It translates decisions of a scheduler orchestration system in such a way that an external cloud native storage solution can act upon. By doing so, Stork extends Kubernetes capabilities with the help of the underlying storage provider, making it more stateful aware.

Stork facilitates stateful workflows such as snapshots, clones, cloud backups, and migrations. Stork provides:

  • Kubernetes native mechanism for executing these workflows, and makes it aware of storage and scheduler.
  • A storage provider agnostic method for executing these workflows.

Where is Stork installed?

Stork is an agent that needs to be installed on all clusters where you want to back up from and restore to. Stork bridges the gap between PX-Backup running on your administration cluster, and the remaining clusters, where you need to backup from and restore to.

Stork capabilities

Stork acts as an abstraction layer between the underlying storage provider and PX-Backup. Stork enables PX-Backup to perform the following tasks:

  • Execute backups and restores on the target cluster
  • Push the Kubernetes resources to the configured object storage location
  • Integrate with storage providers for taking snapshots and pushing snapshots to object storage

Prepare air-gapped environment

If your application cluster is air-gapped, then you must pull the following openstorage images before installing PX-Backup:

  • openstorage/cmdexecutor:0.1
  • openstorage/stork:2.10.0
  • openstorage/kopia-executor:1.2.0
  1. You must then push the above images to your internal registry server, accessible by the air-gapped nodes.

  2. After pushing the images, follow the instructions in the Install PX-Backup section to install PX-Backup.


Last edited: Thursday, Jun 16, 2022