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Updating Redis version Overview

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

Before You Begin

• You should be familiar with the following KubeDB concepts:
  • Redis
  • RedisSentinel
  • RedisOpsRequest

How Update Version Process Works

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

  

The updating process consists of the following steps:

1. At first, a user creates a Redis/RedisSentinel Custom Resource (CR).

2. KubeDB Community operator watches the Redis and RedisSentinel CR.

3. When the operator finds a Redis/RedisSentinel CR, it creates required number of StatefulSets and related necessary stuff like appbinding, services, etc.

4. Then, in order to upgrade the version of the Redis database the user creates a RedisOpsRequest CR with the desired version.

5. Then, in order to upgrade the version of the RedisSentinel database the user creates a RedisSentinelOpsRequest CR with the desired version.

6. KubeDB Enterprise operator watches the RedisOpsRequest and RedisSentinelOpsRequest CR.

7. When it finds a RedisOpsRequest CR, it halts the Redis object which is referred from the RedisOpsRequest. So, the KubeDB Community operator doesn’t perform any operations on the Redis object during the upgrading process.

8. When it finds a RedisSentinelOpsRequest CR, it halts the RedisSentinel object which is referred from the RedisSentinelOpsRequest. So, the KubeDB Community operator doesn’t perform any operations on the RedisSentinel object during the upgrading process.

9. By looking at the target version from RedisOpsRequest/RedisSentinelOpsRequest CR, KubeDB Enterprise operator updates the images of all the StatefulSets.

10. After successfully updating the StatefulSets and their Pods images, the KubeDB Enterprise operator updates the image of the Redis/RedisSentinel object to reflect the updated state of the database.

11. After successfully updating of Redis/RedisSentinel object, the KubeDB Enterprise operator resumes the Redis/RedisSentinel 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 Redis database using upgrade operation.

Next Steps

• Learn how to Update Version of Redis Standalone
• Learn how to Update Version of Redis Cluster
• Learn how to Update Version of Redis Sentinel