How do I force Kubernetes to re-pull an image?

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Kubernetes will pull upon Pod creation if either (see updating-images doc):

  • Using images tagged :latest
  • imagePullPolicy: Always is specified

This is great if you want to always pull. But what if you want to do it on demand: For example, if you want to use some-public-image:latest but only want to pull a newer version manually when you ask for it. You can currently:

  • Set imagePullPolicy to IfNotPresent or Never and pre-pull: Pull manually images on each cluster node so the latest is cached, then do a kubectl rolling-update or similar to restart Pods (ugly easily broken hack!)
  • Temporarily change imagePullPolicy, do a kubectl apply, restart the pod (e.g. kubectl rolling-update), revert imagePullPolicy, redo a kubectl apply (ugly!)
  • Pull and push some-public-image:latest to your private repository and do a kubectl rolling-update (heavy!)

No good solution for on-demand pull. If that changes, please comment; I’ll update this answer.

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