Configure a Custom Registry Mirror
The Dagger Engine can be configured to use container registry mirrors for any registry URL. This allows container images that refer to one registry to instead be redirected to a different one.
Create a file named engine.toml
that contains the registry mirror:
debug = true
insecure-entitlements = ["security.insecure"]
[registry."docker.io"]
mirrors = ["mirror.gcr.io"]
This configuration can be repeated for multiple registries and mirrors if needed:
[registry."docker.io"]
mirrors = ["mirror.a.com", "mirror.b.com"]
[registry."some.other.registry.com"]
mirrors = ["mirror.foo.com", "mirror.bar.com"]
Manually start the Dagger Engine with the custom engine.toml
:
docker run --rm -v /var/lib/dagger --name customized-dagger-engine --privileged --volume $PWD/engine.toml:/etc/dagger/engine.toml registry.dagger.io/engine:v0.10.2
Execute the following commands to test the configuration
export _EXPERIMENTAL_DAGGER_RUNNER_HOST=docker-container://customized-dagger-engine
dagger query --progress=plain <<< '{ container { from(address:"hello-world") { stdout } } }'
The specified hello-world
container will now be pulled from the mirror instead of from Docker Hub.