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In the documentation docker registry is referring to any registry that can host images. Your registry can be for example harbor or gitlab. Whatever registry you use, you can then point containerd to that registries endpoint.

I don’t have a docker registry in an airgapped environment…. I am just using airgapped k3s… and each node uses containerd as its runtime…. Which includes a local image store specific to each node… So I have to point it to all/each of my nodes individual containerd image repos ? So I have to pull each longhorn image into all of them