In this tutorial, you will learn how to setup your own Killing Floor server. The commands were written for Ubuntu, but may be adopted to other Linux distributions (such as CentOS).
Prerequisites
First, install the required packages.
sudo apt-get update
sudo apt-get install lib32gcc1 screen wget
Configure server
Create a directory for your server.
mkdir ~/killingfloor ; cd ~/killingfloor
Download and extract SteamCMD.
wget http://media.steampowered.com/installer/steamcmd_linux.tar.gz
tar -xvzf steamcmd_linux.tar.gz
Run SteamCMD and enter your Steam login identity.
./steamcmd.sh
login <username> <password>
Set the installation directory and wait for the game files to download.
force_install_dir /home/<user>/killingfloor/game/
app_update 215360 validate
Create a startup script for your server.
vi killingfloor.sh
## Paste in these two lines, and save.
cd /home/<user>/killingfloor/game/System/
./ucc-bin server KF-farm.rom?Difficulty=7.0?game=KFmod.KFGameType?VACSecured=true?MaxPlayers=6 -ini=Killingfloor.ini -nohomedir
chmod +x killingfloor.sh
Edit Killingfloor.ini with the settings that you would like to use.
cat /home/<user>/killingfloor/game/System/Default.ini > /home/<user>/killingfloor/game/System/Killingfloor.ini
vi /home/<user>/killingfloor/game/System/Killingfloor.ini
Start your server in screen.
screen -S killingfloor ./killingfloor.sh
Your server is now running, Enjoy!