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SingleStore Volume Expansion

This guide will give an overview on how KubeDB Ops Manager expand the volume of SingleStore.

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • SingleStore
  • SingleStoreOpsRequest

How Volume Expansion Process Works

The following diagram shows how KubeDB Ops Manager expand the volumes of SingleStore database components. Open the image in a new tab to see the enlarged version.

  

The Volume Expansion process consists of the following steps:

1. At first, a user creates a SingleStore Custom Resource (CR).

2. KubeDB Provisioner operator watches the SingleStore CR.

3. When the operator finds a SingleStore CR, it creates required PetSet and related necessary stuff like secrets, services, etc.

4. The petSet creates Persistent Volumes according to the Volume Claim Template provided in the petset configuration. This Persistent Volume will be expanded by the KubeDB Ops-manager operator.

5. Then, in order to expand the volume of the SingleStore database the user creates a SingleStoreOpsRequest CR with desired information.

6. KubeDB Ops-manager operator watches the SingleStoreOpsRequest CR.

7. When it finds a SingleStoreOpsRequest CR, it pauses the SingleStore object which is referred from the SingleStoreOpsRequest. So, the KubeDB Provisioner operator doesn’t perform any operations on the SingleStore object during the volume expansion process.

8. Then the KubeDB Ops-manager operator will expand the persistent volume to reach the expected size defined in the SingleStoreOpsRequest CR.

9. After the successfully expansion of the volume of the related PetSet Pods, the KubeDB Ops-manager operator updates the new volume size in the SingleStore object to reflect the updated state.

10. After the successful Volume Expansion of the SingleStore, the KubeDB Ops-manager operator resumes the SingleStore object so that the KubeDB Provisioner operator resumes its usual operations.

In the next docs, we are going to show a step by step guide on Volume Expansion of various SingleStore database using SingleStoreOpsRequest CRD.