Docker sources

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Two settings serve different downloads: the package repository installs Docker Engine/buildx; a Docker Hub registry mirror supplies container base images used to build rootfs. Defaults use Docker's official package source and leave the host's Docker image-source configuration unchanged. On a new host, that means official Docker Hub.

Interactive or command-line selection

Complete-mode terminal installation asks for both settings. Press Enter to keep defaults. In non-interactive mode:

sudo bash /tmp/llmoj-install.sh --repository houyhlouis/LLMOJ \
  --yes --docker-source https://YOUR_PACKAGE_MIRROR/docker-ce \
  --docker-mirrors https://YOUR_DOCKER_HUB_MIRROR

Use only HTTPS URLs without credentials/query strings. Multiple Hub mirrors use commas. Example URLs above are placeholders, not operating public mirrors.

Option	Expected URL
--docker-source	Base such as https://download.docker.com; installer adds /linux/ubuntu
--docker-mirrors	Docker Hub pull-through endpoint, such as https://mirror.example.com

Do not append /linux/ubuntu to the package-source option. The custom repository must carry Docker's signed Ubuntu packages for your version. The GPG key is still downloaded from https://download.docker.com/linux/ubuntu/gpg, preserving the official trust key. Existing Docker is not replaced by this option. See Docker's Ubuntu repository instructions.

Configuration behavior

When rootfs must be built and custom mirrors are selected, the installer merges registry-mirrors into /etc/docker/daemon.json, preserves unrelated settings, validates the candidate with dockerd --validate, backs up the previous file as daemon.json.llmoj-backup-<UTC timestamp>, and applies the change atomically. Invalid JSON/configuration stops before replacement. A changed configuration restarts Docker and may interrupt existing containers.

Blank mirror input leaves daemon.json unchanged. Web-only installation and reuse of an existing rootfs skip Docker setup. Selecting a different mirror/source on a retry conflicts with recorded installation options; reuse the original options, or perform an explicit configuration migration after installation.

Rootfs builds use the local Docker default builder so daemon mirror settings apply. The original rootfs recipe and pinned base-image digest are retained. Mirrors do not accelerate Ubuntu snapshots, GitHub, npm or language downloads; configure those separately if needed. Docker Hub pull-through mirrors also do not mirror arbitrary third-party registries. See Docker's mirror documentation.

Independent judges

For manual judge setup, install Docker from a repository suited to your server and then, if desired, configure the mirrors with the same helper:

sudo python3 deploy/docker-support.py --mirrors https://YOUR_DOCKER_HUB_MIRROR --configure

It prints changed or unchanged. If changed, restart Docker before building; if unchanged, start it if needed. Then use the default builder:

sudo systemctl restart docker  # Only when mirror configuration changed.
sudo env BUILDX_BUILDER=default bash deploy/sandbox/build.sh build

Keep the previous Docker backup when planning rollback. This helper never prints private host configuration.