How KubeStash Backups Kubernetes Resources

KubeStash v2024.8.14 supports taking backup of Kubernetes resource YAMLs. You can backup the YAML definition of the resources of entire cluster, a particular namespace, or only an application. In this guide, we are going to show you how Kubernetes resource backup works in KubeStash.

How Backup Works

The following diagram shows how KubeStash takes backup of the Kubernetes resources. Open the image in a new tab to see the enlarged version.

  

The backup process consists of the following steps:

1. At first, a user creates a Secret. This secret holds the credentials to access the backend where the backed up data will be stored.

2. Then, she creates a BackupStorage custom resource that specifies the backend information, along with the Secret containing the credentials needed to access the backend.

3. KubeStash operator watches for BackupStorage custom resources. When it finds a BackupStorage object, it initializes the BackupStorage by uploading the metadata.yaml file to the target storage.

4. Then, she creates a BackupConfiguration custom resource that specifies the target, the Addon info with a specified task, etc. It also provides information about one or more repositories, each indicating a path and a BackupStorage for storing the backed-up data.

5. KubeStash operator watches for BackupConfiguration custom resources.

6. Once the KubeStash operator finds a BackupConfiguration object, it creates Repository with the information specified in the BackupConfiguration.

7. KubeStash operator watches for Repository custom resources. When it finds the Repository object, it Initializes Repository by uploading repository.yaml file into the spec.sessions[*].repositories[*].directory path specified in BackupConfiguration.

8. Then, it creates a CronJob for each session with the schedule specified in BackupConfiguration to trigger backup periodically.

9. On the next scheduled slot, the CronJob triggers a backup by creating a BackupSession custom resource.

10. KubeStash operator watches for BackupSession custom resources.

11. When it finds a BackupSession object, it creates a Snapshot custom resource for each Repository specified in the respective session of the BackupConfiguration.

12. Then, it resolves the respective Addon and Function and prepares a backup Job definition.

13. Then, it creates the Job to backup the desired resource YAMLs.

14. Then, the Job dumps the Kubernetes Resource YAML, and store them temporarily in a directory. Then, it uploads the content of the directory file to the target storage.

15. After the backup process is completed, the backup Job updates the status.components[*] field of the Snapshot resources.

Next Steps

• Backup the YAMLs of a particular application using KubeStash following the guide from here.
• Backup the YAMLs of an entire Namespace using KubeStash following the guide from here.
• Backup the YAMLs of your entire Kubernetes cluster using KubeStash following the guide from here.