Add support for mirrors

[sathieu]

containerd can use mirrors., but as the FAQ tells:

nerdctl ignores [plugins."io.containerd.grpc.v1.cri"] config

Expected behavior, because nerdctl does not use CRI (Kubernetes Container Runtime Interface) API.

See the questions below for how to configure nerdctl.

How to configure registry mirrors in nerdctl?

( Triggered by kubernetes-sigs/kubespray#8375).

(NB: this is similar to older issue #199)

[AkihiroSuda]

PR:

• Support /etc/containerd/certs.d/<HOST:PORT>/hosts.toml #642

[sathieu]

@AkihiroSuda Looking at the code, it does'nt support:

#$ sudo cat /etc/containerd/certs.d/quay.io/hosts.toml
# server = "https://quay.io"

[host."https://gitlab-registry.k8s.example.org/v2/external-registries/quay.io"]
  capabilities = ["pull", "resolve"]
  override_path = true

Does it?

[AkihiroSuda]

Implemented in PR #642 , but not merged yet

(And mirroring is not tested yet)