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harbor/contrib/Configure_mirror.md

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Configuring Harbor as a local registry mirror

Harbor runs as a local registry by default. It can also be configured as a registry mirror, which caches downloaded images for subsequent use. Note that under this setup, the Harbor registry only acts as a mirror server and no longer accepts image pushing requests. Edit Deploy/templates/registry/config.yml before executing ./prepare, and append a proxy section as follows:

proxy:
  remoteurl: https://registry-1.docker.io

In order to access private images on the Docker Hub, a username and a password can be supplied:

proxy:
  remoteurl: https://registry-1.docker.io
  username: [username]
  password: [password]

You will need to pass the --registry-mirror option to your Docker daemon on startup:

docker --registry-mirror=https://<my-docker-mirror-host> daemon

For example, if your mirror is serving on http://reg.yourdomain.com, you would run:

docker --registry-mirror=https://reg.yourdomain.com daemon

Refer to the Registry as a pull through cache for detailed information.