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How do you mean? The CLI?

That’s `ctr`: https://github.com/projectatomic/containerd/blob/master/docs...

is it able to pull a random ubuntu or fedora image ?

Yes. The image standard for containers is called OCI and there are several ways to use them outside of Docker.

but, where does it pull them from ? who's hosting the images ?

They default to docker compatibility, so if you specify 'busybox' it will pull your default registry, which defaults to dockerhub. If you specify 'k8s.gcr.io/etcd-amd64', then it will try to pull from google cloud registry.

You can redirect such urls to a different registry if you prefer, by using the containerd mirrors configuration.

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