1. Clone this repository
2. Copy the main and zone folder(except main/video) from an installed and patched CoD4 to the cod4 subfolder.
3. Build the docker image, e.g. docker build --tag=cod4image .
4. Run the docker image: docker run --user=root -d -p 28960:28960/udp cod4image
5. Connect to the server!

If you want to customize the server.cfg file you can mount /home/cod4/main/server.cfg as a volume. The server binary originates from http://www.opferlamm-clan.de/wbb2/thread.php?threadid=16895&threadview=0&hilight=&hilightuser=0&page=1 and the punkbuster files from http://www.pbbans.com/forums/files/call-of-duty-4-linux-file93.html