I have deployed an application in k8s cluster with 8 replicas. but how to ensure that there will be at least 3 pods always running during rolling update, can anyone please suggest a solution ?
Thanks in advance.
2 Answers
you can set the required values on maxSurge and maxUnavailable
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 50%
type: RollingUpdate
setting maxUnavailable to 50% will make sure that you always have 4 pods running.
You should be able to use the configuration option maxUnavailable: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#max-unavailable to guarantee that certain number of replicas are available during an update.
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