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Upgrading PerconaXtraDB version Overview

This guide will give you an overview on how KubeDB Enterprise operator upgrade the version of PerconaXtraDB database.

Before You Begin

How Upgrade Process Works

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

  Upgrading Process of PerconaXtraDB
Fig: Upgrading Process of PerconaXtraDB

The upgrading 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 upgrade the version of the PerconaXtraDB database the user creates a PerconaXtraDBOpsRequest CR with the desired version.

  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 upgrading process.

  7. By looking at the target version from PerconaXtraDBOpsRequest CR, KubeDB Enterprise operator updates the images of all the StatefulSets. After each image update, the operator performs some checks such as if the oplog is synced and database size is almost same or not.

  8. After successfully updating the StatefulSets and their Pods images, the KubeDB Enterprise operator updates the image of the PerconaXtraDB object to reflect the updated state of the database.

  9. After successfully updating of PerconaXtraDB object, the KubeDB Enterprise operator resumes the PerconaXtraDB 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 PerconaXtraDB database using upgrade operation.