Add global docker image prefix to microk8s, since many people cannot access k8s.gcr.io

[fzyzcjy]

Hi thanks for the library! I hope to add global docker image prefix to microk8s. In other words, if microk8s originally wants to pull from k8s.gcr.io/image-name, now with a global setting (say globalPrefix: my.registry.com), it is automatically renamed into my.registry.com/k8s.gcr.io/image-name.

This is because in many people, including China with 1.4 billion people, cannot access k8s.gcr.io since it is banned.

Related but not the same (proposed solution different): https://github.com/canonical/microk8s/issues/472

[ktsakalozos]

Thank you for the suggestion @fzyzcjy. This is definitely something we need to address. Maybe a solution like [1] would be best.

[1] https://github.com/FairwindsOps/saffire

[neoaggelos]

We have added documentation for this in https://microk8s.io/docs/registry-private#configure-registry-mirrors-7

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.