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Clarify init container concept #47946

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Sep 23, 2024
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Clarify init container concept #47946

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10 changes: 8 additions & 2 deletions content/en/docs/concepts/workloads/pods/init-containers.md
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Expand Up @@ -292,10 +292,16 @@ If the Pod [restarts](#pod-restart-reasons), or is restarted, all init container
must execute again.

Changes to the init container spec are limited to the container image field.
Altering an init container image field is equivalent to restarting the Pod.
Directly altering the `image` field of an init container does _not_ restart the
Pod or trigger its recreation. If the Pod has yet to start, that change may
have an effect on how the Pod boots up.

For a [pod template](/docs/concepts/workloads/pods/#pod-templates)
you can typically change any field for an init container; the impact of making
that change depends on where the pod template is used.

Because init containers can be restarted, retried, or re-executed, init container
code should be idempotent. In particular, code that writes to files on `EmptyDirs`
code should be idempotent. In particular, code that writes into any `emptyDir` volume
should be prepared for the possibility that an output file already exists.

Init containers have all of the fields of an app container. However, Kubernetes
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