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Configure Image Registry

This document describes the method to configure the image registry for containerd for use with the cri plugin.

With containerd, docker.io is the default image registry. You can also set up other image registries similar to docker.

To configure image registries create/modify the /etc/containerd/config.toml as follows:

[plugins.cri.registry.mirrors]
  [plugins.cri.registry.mirrors."docker.io"]
    endpoint = ["https://registry-1.docker.io"]
  [plugins.cri.registry.mirrors."test.secure-registry.io"]
    endpoint = ["https://HostIP1:Port1"]
  [plugins.cri.registry.mirrors."test.insecure-registry.io"]
    endpoint = ["http://HostIP2:Port2"]

The default configuration can be generated by containerd config default > /etc/containerd/config.toml.

The endpoint is a list that can contain multiple image registry URLs split by commas. When pulling an image from a registry, containerd will try these endpoint URLs one by one, and use the first working one.

After modify the config file, you need restart the containerd service.