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PerconaXtraDB Vertical Scaling

This guide will give an overview on how KubeDB Enterprise operator vertically scales up PerconaXtraDB.

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • PerconaXtraDB
  • PerconaXtraDBOpsRequest

How Horizontal Scaling Process Works

The following diagram shows how KubeDB Enterprise operator scales up or down PerconaXtraDB database components. Open the image in a new tab to see the enlarged version.

  

The vertical scaling process consists of the following steps:

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

2. KubeDB Community operator watches the PerconaXtraDB CR.

3. When the operator finds a PerconaXtraDB CR, it creates required number of StatefulSets and related necessary stuff like secrets, services, etc.

4. Then, in order to update the resources(for example CPU, Memory etc.) of the PerconaXtraDB database the user creates a PerconaXtraDBOpsRequest CR with desired information.

5. KubeDB Enterprise operator watches the PerconaXtraDBOpsRequest CR.

6. When it finds a PerconaXtraDBOpsRequest CR, it halts the PerconaXtraDB object which is referred from the PerconaXtraDBOpsRequest. So, the KubeDB Community operator doesn’t perform any operations on the PerconaXtraDB object during the vertical scaling process.

7. Then the KubeDB Enterprise operator will update resources of the StatefulSet Pods to reach desired state.

8. After the successful update of the resources of the StatefulSet’s replica, the KubeDB Enterprise operator updates the PerconaXtraDB object to reflect the updated state.

9. After the successful update of the PerconaXtraDB resources, the KubeDB Enterprise operator resumes the PerconaXtraDB object so that the KubeDB Community operator resumes its usual operations.

In the next docs, we are going to show a step by step guide on updating resources of PerconaXtraDB database using PerconaXtraDBOpsRequest CRD.