anti-affinity between leader and follower pair

[bilalhacks]

i have 3 node kubernetes cluster.
i want anti affinty b/w master AND with master - slave replica.
ie,
node 1 can have leader-0 and follower-1 or follower-2. not follower-0.
similarly node 2 can have leader-1 follower-2 or follower-0. not follover-1.

how can I achive this?

[arpan57]

Hi @bilalhacks

You can achieve exactly that with the built‑in master/slave anti‑affinity, but it only works when the operator webhook is enabled.
Please have a look at https://github.com/OT-CONTAINER-KIT/redis-operator/blob/main/charts/redis-cluster/values.yaml#L36-L40

If you use Helm charts:

redisOperator: webhook: true
Enable master/slave anti‑affinity in the redis‑cluster chart:
redisCluster: enableMasterSlaveAntiAffinity: true
==> If you apply CRDs directly:
Add this annotation to the RedisCluster:
metadata: annotations: redisclusters.redis.redis.opstreelabs.in/role-anti-affinity: "true"
(You still must enable the operator webhook.)

What this annotation does:
The webhook injects a required podAntiAffinity so leader-0 and follower-0 can’t land on the same node, but leader‑0 can coexist with follower‑1 or follower‑2 — exactly as you described.