How to have an annotation only in one pod of a given deployment?
Question
Imagine you have a Kubernetes deployment in a cluster with autoscaling capabilities.
I want to make sure that only of the pods from this deployment contains a specific annotation.
It could be for example the first running pod, and when it stops working this annotation would be replicated to a different pod.
1 answers
solution1
2 2020-08-16 04:57:49
If you really want to prevent downtime while some nodes are going down annotations is probably not the best way. You can use a combination of some of these.
- Pod Topology Spread Constraints . For example, make sure there is always a pod running in one of the availability zones. Or on a node that never goes down.
- Pod Disruption Budget (mentioned in the comments above). For example, make sure that you always have a minimum set of unavailable pods. For example, don't allow the cluster autoscaler to drain the node unless another pod is up somewhere else.
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