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You are looking at the documentation of a prior release. To read the documentation of the latest release, please visit here.

New to KubeDB? Please start here.

Redis Vertical Scaling Overview

This guide will give you an overview on how KubeDB Ops Manager updates the resources(for example CPU and Memory etc.) of the Redis database.

Before You Begin

How Vertical Scaling Process Works

The following diagram shows how KubeDB Ops Manager updates the resources of the Redis database. Open the image in a new tab to see the enlarged version.

  Vertical scaling process of Redis
Fig: Vertical scaling process of Redis

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 update the version of the Redis database the user creates a RedisOpsRequest CR with the desired version.

  5. Then, in order to update 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 updating 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 updating process.

  9. After the successful update of the resources of the StatefulSet’s replica, the KubeDB Enterprise operator updates the Redis/RedisSentinel object to reflect the updated state.

  10. 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 updating of a Redis database using update operation.

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