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MariaDB Vertical Scaling

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

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • MariaDB
  • MariaDBOpsRequest

How Horizontal Scaling Process Works

The following diagram shows how KubeDB Enterprise operator scales up or down MariaDB 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 MariaDB Custom Resource (CR).

2. KubeDB Community operator watches the MariaDB CR.

3. When the operator finds a MariaDB 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 MariaDB database the user creates a MariaDBOpsRequest CR with desired information.

5. KubeDB Enterprise operator watches the MariaDBOpsRequest CR.

6. When it finds a MariaDBOpsRequest CR, it halts the MariaDB object which is referred from the MariaDBOpsRequest. So, the KubeDB Community operator doesn’t perform any operations on the MariaDB 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 MariaDB object to reflect the updated state.

9. After the successful update of the MariaDB resources, the KubeDB Enterprise operator resumes the MariaDB 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 MariaDB database using MariaDBOpsRequest CRD.