Generator-jhipster: Redis Cluster support

[pascalgrimaud]

Overview of the feature request

Our current implementation of Redis is for single server. In real production, it will never be the case, it will be with a Redis Cluster.

Motivation for or Use Case

A single server of Redis will be never used in prod.

See https://github.com/jhipster/generator-jhipster/blob/master/generators/server/templates/src/main/java/package/config/CacheConfiguration.java.ejs#L729

See https://github.com/redisson/redisson/wiki/2.-Configuration#24-cluster-mode

The goal would be to have:

• a docker compose file to start a Redis cluster in dev
• the correct config in yaml
• the integration tests, which could still be with single server I think

Then, for all deployment (docker compose, k8s etc) use a Redis Cluster

Related issues or PR

https://github.com/jhipster/generator-jhipster/pull/10057
https://github.com/jhipster/generator-jhipster/issues/9280

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[pascalgrimaud]

cc @Shaolans @juliensadaoui @avdev4j

[pascalgrimaud]

I'm adding a bounty on this, as I know some of us will need this soon.
The bounty can be splitted in 2 part, 1 for dev/java, the other for the DevOps and deployment part

[pascalgrimaud]

I'm starting to work on the dev part.

[pascalgrimaud]

About the Ops part, in fact, nothing is done today: Kubernetes, Openshift, AWS, etc...
It's only done with Docker-Compose.

So I'm reducing the bounty to 100$ to be fair -> if someone want to work on the Ops part, let me know and let's open a new ticket for that

[pascalgrimaud]

I'm closing this as both PR have been merged.
I'll update the documentation about this

[pascalgrimaud]

Bounty claimed: https://opencollective.com/generator-jhipster/expenses/13928

[vrijmetse]

Does this feature works with AWS Elasticache Redis (with cluster mode enabled) like stated here https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Endpoints.html#Endpoints.Find.RedisCluster ?

[pascalgrimaud]

Look at the specific code here:
https://github.com/jhipster/generator-jhipster/blob/main/generators/server/templates/src/main/java/package/config/CacheConfiguration.java.ejs#L746-L756

For me, the last time I tried the cluster mode:

• it works locally
• it works for one of my customer project, with Redis deployed with Kubernetes

I don't see any reason why it won't work for AWS Elasticache Redis. I would say: try :)