Only 23Mb. Inspired by XUJINKAI.
I. replace /DOWNLOAD_DIR and /CONFIG_DIR for save data, and YOUR_SECRET_CODE for security. Run command below
sudo docker run -d \
--name unraid-aria2-with-webui \
-p 6800:6800 \
-v /CONFIG_DIR:/conf \
-v /DOWNLOAD_DIR:=/download \
-e SECRET=YOUR_SECRET_CODE \
-e PGID=911 \
-e PUID=911 \
fanningert/aria2-daemon
sudo docker build -f Dockerfile -t fanningert/aria2-daemon .