Registries

Container registry credentials can be added in the repository settings.

This allows to authenticate against the respective registry and pull private images while also avoiding rate-limiting.

Registry hostnames are matched to each image in the YAML config. If the hostname matches, the stored registry credentials are used to authenticate and pull the image.

Caution

Credentials are used by the agent and are never exposed to build containers.

Note

The implicit default when not specifying a registry is always docker.io.

Examples:

• Image quay.io/foo/bar has hostname gcr.io
• Image foo/bar has hostname docker.io
• Image qux.com:8000/foo/bar has hostname qux.com:8000

Hostname matching logic:

• Hostname quay.io matches image: quay.io/foo/bar
• Hostname docker.io matches image: golang
• Hostname docker.io matches image: library/golang
• Hostname docker.io matches image: bradrydzewski/golang
• Hostname docker.io matches image: bradrydzewski/golang:latest