base image with Steam

steamcmd ready to download and run stuff inside a container.

If +login anonymous works (see the examples below) then you don't need to log in, leaving your personal credentials on the servers.

Docker

You most probably want to use it like this on the console:

# Download the latest version of something, like a game server.
docker run -ti --rm \
  -v /var/lib/steam:/var/lib/steam \
  wmark/steam-base /opt/steam/steamcmd.sh \
    +login anonymous \
    +force_install_dir /var/lib/steam/ark-dedicated \
    +app_update 376030 validate \
    +quit

# This is how you can run something in this container, which derives from Ubuntu.

# This list of ports is for ARK Survival.
# Your game will use different ports.
docker run -t --rm --name "my_ark" \
  -v /var/lib/steam:/var/lib/steam \
  -p 7777:7777/udp \
  -p 27015:27015/udp \
  -p 32330:32330 \
  wmark/steam-base \
    /var/lib/steam/ark-dedicated/ShooterGame/Binaries/Linux/ShooterGameServer \
    -server -log \
    TheIsland?listen?SessionName=no-name-server-clone?ServerAdminPassword=geheim

It is a good idea to store folder /var/lib/steam outside of any containers to avoid repeated downloads, and to share the files across multiple game server instances.

rkt

The default implied user and group is --user=1000 --group=1000. If you want to install games using a different user or group, then adjust the target directory's ownership as well.

mkdir -p /var/lib/steam/logs
chown 1000:1000 /var/lib/steam
chattr +C /var/lib/steam       # optional

sudo rkt run --interactive \
  --volume gameserver,kind=host,source=/var/lib/steam \
  --volume logdir,kind=host,source=/var/lib/steam/logs \
  --stage1-from-dir=stage1-fly.aci \
  blitznote.com/aci/steamcmd:1 \
    -- +login anonymous \
    +force_install_dir /var/lib/steam/csgo \
    +app_update 740 validate \
    +quit