Dockerfile for running a Killing Floor 2 server

• GitHub: https://github.com/dwurf/docker-kf2
• Docker Hub: https://hub.docker.com/r/dwurf/docker-kf2/

2GB RAM and 20GB free disk space are essential. SSD recommended, otherwise map changes will take a long time. Disk space requirements will keep going up as updates are released.

A couple of amendments specific to RHEL and any offshoots:

To allow an IPv4 address to be shared with containers on a RHEL host, you need to ensure that net.ipv4.ip_forward is enabled. This can be set using sysctl -w net.ipv4.ip_forward=1. Afterwards, you must restart docker systemctl restart docker or service docker restart depending on if you are using init.d or systemd.

With docker -v mounts you can add :z to the end of the mount argument to add the relevant SELinux contexts to use the bind mount automatically. For example -v $HOME/kf2:/home/steam/kf2server becomes -v $HOME/kf2:/home/steam/kf2server:z.

mkdir -p $HOME/{kf2,kf2_steamdir}
docker run -d -t --name kf2 -p 0.0.0.0:20560:20560/udp \
    -p 0.0.0.0:27015:27015/udp \
    -p 0.0.0.0:7777:7777/udp \
    -p 0.0.0.0:8080:8080 \
    -v $HOME/kf2:/home/steam/kf2server \
    -v $HOME/kf2_steamdir:/home/steam/steam \
    dwurf/docker-kf2:latest

Configuration is done via environment variables. To run a long, hard server:

docker run -d -t --name kf2 -p 0.0.0.0:20560:20560/udp \
    -p 0.0.0.0:27015:27015/udp \
    -p 0.0.0.0:7777:7777/udp \
    -p 0.0.0.0:8080:8080 \
    -v $HOME/kf2:/home/steam/kf2server \
    -v $HOME/kf2_steamdir:/home/steam/steam \
    -e KF_DIFFICULTY=1 \
    -e KF_GAME_LENGTH=2 \
    dwurf/docker-kf2:latest

Run with the command update

docker run -d -t --name kf2 -p 0.0.0.0:20560:20560/udp \
    -p 0.0.0.0:27015:27015/udp \
    -p 0.0.0.0:7777:7777/udp \
    -p 0.0.0.0:8080:8080 \
    -v $HOME/kf2:/home/steam/kf2server \
    -v $HOME/kf2_steamdir:/home/steam/steam \
    dwurf/docker-kf2:latest \
    update

Further arguments get passed to the update command, e.g.

docker run -d -t --name kf2 -p 0.0.0.0:20560:20560/udp \
    -p 0.0.0.0:27015:27015/udp \
    -p 0.0.0.0:7777:7777/udp \
    -p 0.0.0.0:8080:8080 \
    -v $HOME/kf2:/home/steam/kf2server \
    -v $HOME/kf2_steamdir:/home/steam/steam \
    dwurf/docker-kf2:latest \
    update -beta preview validate

NOTE: Special characters are anything that sed considers special, so /, ^, , * etc. To escape the character, prepend \ before it as in the examples provided in the compose files and above.

1. Ensure 'command' in docker-compose.yml is not present. Updates will be handled from the first server only.
2. Change ports (increment), set environment variables to match
3. Change server name (optional)

Update the volume mounts as follows:

Map the following read-only volume from server 1

• $HOME/kf2:/home/steam/kf2server:ro \

Map the following read-write volumes

• $HOME/kf2-server2/steam/:/home/steam/steam
• $HOME/kf2-server2/kf2server/KFGame/Logs:/home/steam/kf2server/KFGame/Logs
• $HOME/kf2-server2/kf2server/KFGame/Config:/home/steam/kf2server/KFGame/Config

These are only required for Steam Workshop maps (see below)

• $HOME/kf2-server2/kf2server/Binaries/Win64/steamapps:/home/steam/kf2server/Binaries/Win64/steamapps
• $HOME/kf2-server2/kf2server/KFGame/Cache:/home/steam/kf2server/KFGame/Cache

You must also copy the basic config files from server1

mkdir -p $HOME/kf2-server2/kf2server/KFGame/Config
cp -a $HOME/kf2/kf2server/KFGame/Config/* $HOME/kf2-server2/kf2server/KFGame/Config

Under kf2server, modify the file KFGame/Config/LinuxServer-KFEngine.ini as per Tripwire's wiki

Example shown below is for Biolapse - Biotics Holdout by

[OnlineSubsystemSteamworks.KFWorkshopSteamworks]
ServerSubscribedWorkshopItems=1258411772

You'll also need to add the maps to LinuxServer-KFGame.ini as described in the wiki here and here.

Examples:

[KFGame.KFGameInfo]
...
GameMapCycles=(Maps=("KF-BurningParis","KF-Biolapse"))
...

[KF-Biolapse KFMapSummary]
MapName=KF-Biolapse
ScreenshotPathName=UI_MapPreview_TEX.UI_MapPreview_Placeholder

docker build -t dwurf/docker-kf2:latest .

• KF1 server in Docker

• Add support for running multiple KF2 servers from the one directory
• Map logs and config to another volume(s)
• This is docker, we shouldn't need logs (use docker logs) and config should be done via env variables (i.e. move the config file outside of the volume but it doesn't need to be exposed)
• See also ConfigSubDir under https://wiki.tripwireinteractive.com/index.php?title=Dedicated_Server_(Killing_Floor_2)#Command_Line_Launch_Options
• Add support for custom map cycles https://wiki.tripwireinteractive.com/index.php?title=Dedicated_Server_(Killing_Floor_2)#Maps