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How do I create a post-init container in Kubernet?

I am trying to create a redis cluster on K8s. I need a stroller container to create a cluster after the required number of redis containers are online.

I have 2 containers redis

and a stroller. I run them in statefulset

with 6 cues. I need the stroller container to start only once per replica and then terminate. He does so, but K8s continues to fiddle with the stroller.

I tried to install restartPolicy

at the container level but it is not valid. It seems K8s only supports this at the swap level. I cannot use this because I want the container to redis

be restarted, not the stroller.

Is there something like post-init container

? In order to join the cluster, my wheelchair needs to be started after the main container redis

. Therefore it is init container

useless.

What's the best way to solve this problem with K8s 1.6?

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2 answers


The best answer is to simply force the stroller into an infinite sleep cycle. If it never exits, it will never be restarted. Resource constraints can be used to ensure minimal cluster impact.



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I advise you to use Kubernetes Jobs:

https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/



This kind of task will work until it is completed once. In this task, you can try to determine if all the required nodes are available to form a cluster.

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