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docs(drain cleaner): considerations when using anti-affinity #9482

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Dec 22, 2023
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docs(drain cleaner): considerations when using anti-affinity #9482

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docs(drain cleaner): considerations when using anti-affinity
PaulRMellor Dec 21, 2023
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docs(review): edits to doc from comments by FV and JS
PaulRMellor Dec 22, 2023
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6 changes: 6 additions & 0 deletions documentation/modules/managing/proc-drain-cleaner-using.adoc
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Expand Up @@ -14,6 +14,12 @@ The Cluster Operator performs rolling updates based on the annotation.

* You have xref:proc-drain-cleaner-deploying-{context}[deployed the Strimzi Drain Cleaner].

.Considerations when using anti-affinity configuration

When using xref:assembly-scheduling-str[anti-affinity] with your Kafka or ZooKeeper pods, consider adding a spare worker node to your cluster.
Including spare nodes ensures that your cluster has the capacity to reschedule pods during node draining or temporary unavailability of other nodes.
When a worker node is drained, and anti-affinity rules restrict pod rescheduling on alternative nodes, spare nodes help prevent restarted pods from becoming unschedulable. This mitigates the risk of the draining operation failing.

.Procedure

. Drain a specified Kubernetes node hosting the Kafka broker or ZooKeeper pods.
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