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MariaDB Volume Expansion

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

Before You Begin

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

How Volume Expansion Process Works

The following diagram shows how KubeDB Ops Manager expand the volumes of MariaDB 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 MariaDB Custom Resource (CR).

2. KubeDB Community operator watches the MariaDB CR.

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

4. The statefulSet creates Persistent Volumes according to the Volume Claim Template provided in the statefulset configuration. This Persistent Volume will be expanded by the KubeDB Enterprise operator.

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

6. KubeDB Enterprise operator watches the MariaDBOpsRequest CR.

7. When it finds a MariaDBOpsRequest CR, it pauses 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 volume expansion process.

8. Then the KubeDB Enterprise operator will expand the persistent volume to reach the expected size defined in the MariaDBOpsRequest CR.

9. After the successfully expansion of the volume of the related StatefulSet Pods, the KubeDB Enterprise operator updates the new volume size in the MariaDB object to reflect the updated state.

10. After the successful Volume Expansion of the MariaDB, 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 Volume Expansion of various MariaDB database using MariaDBOpsRequest CRD.