has anyone deployed Redis in cluster mode

[Krish Narukulla]

We have deployed Redis using containers on Kubernetes. There are many options of clustering available. Which option would suit best for container world.

Thanks

Krish

[Jose Moreira]

None. ;-)

K8s is not for an in-memory DB as redis, k8s is for stateful products. 

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[Krish Narukulla]

Redis also has persistent state, can be modeled as Stateful set.

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Krish Narukulla
 

[Jose Moreira]

k8s gis complex to implement and the benefits are minimum. if you want HA and automatic failover, load balancer, etc, not need for k8s. Redis Cluster or Sentinel provides that.

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[David Maier (Redis Labs)]

Hi Krish,

@Jose I would say that you can (in general) indeed have stateless (web) services in K8s. I would even say that this is very common. 

If you don't care about the state then Redis standalone plus client-side sharding might be an option. However, your state gets lost when a container will be respawned.

If you do care about the state by having specific HA and durability requirements, then Sentinel (single master + 2 replicas) or Redis OSS Cluster (multiple master shards + 2 replicas) might be the better choice.

It kind of depends on your HA and scalability requirements.

Redis Labs' K8s integration is coming with an Operator (operator pattern) which helps to deploy and operate Redis Enterprise Clusters in K8s. It supports stateless and stateful use cases within the same cluster (via seperated databases).

If you are not looking for an Enterprise solution, then you might be able to find K8s operators for Redis OSS in the community.

Hope this helps.

Regards,

David

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