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Upgrading MySQL version Overview

This guide will give you an overview of how KubeDB enterprise operator upgrades the version of MySQL database.

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • MySQL
  • MySQLOpsRequest

How Upgrade Process Works

The following diagram shows how KubeDB enterprise operator used to upgrade the version of MySQL. Open the image in a new tab to see the enlarged version.

The upgrading process consists of the following steps:

1. At first, a user creates a MySQL cr.

2. KubeDB community operator watches for the MySQL cr.

3. When it finds one, it creates a StatefulSet and related necessary stuff like secret, service, etc.

4. Then, in order to upgrade the version of the MySQL database the user creates a MySQLOpsRequest cr with the desired version.

5. KubeDB enterprise operator watches for MySQLOpsRequest.

6. When it finds one, it halts the MySQL object so that the KubeDB community operator doesn’t perform any operation on the MySQL during the upgrading process.

7. By looking at the target version from MySQLOpsRequest cr, KubeDB enterprise operator takes one of the following steps:

   • either update the images of the StatefulSet for upgrading between patch/minor versions.
   • or creates a new StatefulSet using targeted image for upgrading between major versions.

8. After successful upgradation of the StatefulSet and its Pod images, the KubeDB enterprise operator updates the image of the MySQL object to reflect the updated cluster state.

9. After successful upgradation of MySQL object, the KubeDB enterprise operator resumes the MySQL object so that the KubeDB community operator can resume its usual operations.

In the next doc, we are going to show a step by step guide on upgrading of a MySQL database using upgrade operation.