BUG | Elasticache | Changing Cluster Mode from "disabled" to "compatible" Error | Must specify a parameter group for cluster mode update.

Question

I am attempting to update a Redis OSS Cache to use cluster mode `compatible` (and eventually `enabled`). It is currently `disabled`.

I've tried to do this both through terraform and through the AWS Console. I get the same error in either case: `Must specify a parameter group for cluster mode update.`

The problem is that my Redis OSS Cache already has a parameter group assigned? So seems like a bug.

I am using Redis Engine `7.1.0`

Riku_Kobayashi · Answer

Hello.

To enable cluster mode from ElastiCache Redis with cluster mode disabled, you need to set it to "cluster-enabled" in the parameter group.  
Therefore, to enable it from a disabled state, you need to create a custom parameter group with "cluster-enabled" enabled in advance, and then change the parameter group at the same time when changing the cluster mode.  
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/modify-cluster-mode.html

BUG | Elasticache | Changing Cluster Mode from "disabled" to "compatible" Error | Must specify a parameter group for cluster mode update.

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