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Dockerfile

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+FROM zombi/steam-base
+MAINTAINER MadMaurice <madmaurice@zom.bi>, Paul <paul@zom.bi>
+EXPOSE 27015/udp
+
+ADD bin/entrypoint.sh /entrypoint.sh
+RUN chmod +xr /entrypoint.sh
+USER steam
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["+sv_pure", "1", "+map", "ctf_2fort.bsp", "+maxplayers", "24"]

README.md

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+## steam-tf2
+steam-tf2 is the base image for an 'Team Fortress 2' server
+
+### Building steam-tf2
+
+first build the `steam-base` image.
+
+```
+docker build -t zombi/steam-tf2 .
+```
+
+### Running steam-tf2
+
+```
+docker run -dit \
+ --name tf2-1 \
+ -p 27015:27015/udp \
+ -p 27015:27015 \
+ -v /data/steam-games/:/home/steam/games/ \
+ zombi/steam-tf2 +sv_pure 1 +map ctf_2fort +maxplayers 24
+```
+
+to start up a simple server to capture some flags.

bin/entrypoint.sh

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+#!/bin/bash
+
+# what are we trying to install?
+game_nm=tf
+game_id=232250
+
+# install game to this directory
+installdir=/home/steam/games/$game_nm
+
+# if path does not exist, create it
+mkdir -p $installdir
+
+if [[ -w $installdir ]] # can we write into the directory?
+then
+	# Install or update the game in /home/steam/games/[game name]
+	/opt/steamcmd/steamcmd.sh \
+		+login anonymous \
+		+force_install_dir $installdir \
+		+app_update $game_id validate \
+		+quit
+else
+	# install dir maybe mounted read-only, simply
+	# skip installing/updating and inform the user.
+	echo "Skipped game installation."
+fi
+
+# run the next commands from the installdir
+cd $installdir
+
+# is the game launcher not executable?
+if [[ ! -x ./srcds_run ]]
+then
+	# we cant run the game then.
+	echo "game launcher not found, installed incorrectly?"
+	exit 1
+fi
+
+# launch the game!
+exec ./srcds_run \
+	-game $game_nm \
+	-console \
+	$@ # append all remaining parameters