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specify-mirrors

Same as ../basic/, but pins upstream Ubuntu and Debian mirrors via CLI flags. Useful when geo-detection picks a slow mirror, or when you want a fixed, reproducible upstream.

What's different

The compose file passes flags to the container:

command: --ubuntu=cn:tsinghua --debian=cn:tsinghua

Both cn:tsinghua and cn:ustc (and a handful of other shortcuts) are built-in aliases. You can also pass full URLs:

command: >-
  --ubuntu=https://mirrors.tuna.tsinghua.edu.cn/ubuntu/
  --debian=https://mirrors.ustc.edu.cn/debian/

Run

cd examples/specify-mirrors
docker compose up -d

Verify

curl -I http://127.0.0.1:3142/healthz

curl -x http://127.0.0.1:3142 \
     http://archive.ubuntu.com/ubuntu/dists/noble/Release

Configuring via YAML instead of flags

The same overrides can live in ../config-template/apt-proxy.yaml under the mirrors: block — handy if you also want to tune cache size, TLS, or storage backend at the same time.