gmod-custom-image/Dockerfile

# BASE IMAGE
FROM docker.io/library/debian:bookworm-slim

LABEL maintainer="Penta"
LABEL description="Up to date Garry's Mod server container image"

ENV DEBIAN_FRONTEND=noninteractive

# INSTALL NECESSARY PACKAGES
RUN dpkg --add-architecture i386 && \
    apt-get update && \
    apt-get install -y --no-install-recommends \
    bash wget curl ca-certificates tar lsof procps psmisc iproute2 file gdb net-tools \
    libc6 libc6:i386 libstdc++6 libstdc++6:i386 libgcc-s1 libgcc-s1:i386 \
    zlib1g zlib1g:i386 libcurl4 libcurl4:i386 \
    libncurses5:i386 libtinfo5 \
    libsdl1.2debian libfontconfig1 \
    libglib2.0-0 libnss3 libasound2 \
    libx11-6 libxext6 libxi6 libxrender1 \
    libfreetype6 libgtk2.0-0 libgdk-pixbuf-2.0-0 libpangocairo-1.0-0 \
    libtcmalloc-minimal4 && \
    rm -rf /var/lib/apt/lists/*

# SET STEAM USER
RUN useradd -d /app -m steam
USER steam

WORKDIR /app
RUN mkdir /app/server && mkdir /app/steamcmd

# INSTALL STEAMCMD
RUN wget -P /tmp/ https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz \
    && tar -xvzf /tmp/steamcmd_linux.tar.gz -C /app/steamcmd/ \
    && rm -rf /tmp/steamcmd_linux.tar.gz

# SETUP STEAMCMD TO DOWNLOAD GMOD SERVER
RUN /app/steamcmd/steamcmd.sh +@sSteamCmdForcePlatformType linux +force_install_dir /app/server +login anonymous +app_update 4020 validate +quit

# SETUP BINARIES FOR x32 and x64 bits
RUN mkdir -p /app/.steam/sdk32 /app/.steam/sdk64 && cp -v /app/steamcmd/linux32/steamclient.so /app/.steam/sdk32/steamclient.so && cp -v /app/steamcmd/linux64/steamclient.so /app/.steam/sdk64/steamclient.so

# CREATE DATABASE FILE
RUN touch /app/server/garrysmod/sv.db

# CREATE CACHE FOLDERS
RUN mkdir -p /app/server/steam_cache/content && mkdir -p /app/server/garrysmod/cache/srcds

ENV LD_LIBRARY_PATH=/app/server/bin:/app/server:/app/.steam/sdk32:/app/.steam/sdk64:/app/steamcmd/linux32:/app/steamcmd/linux64
ENV HOME=/app
ENV USER=steam

# PORT FORWARDING
EXPOSE 27015
EXPOSE 27015/udp
EXPOSE 27005/udp

# SET ENVIRONMENT VARIABLES
ENV MAXPLAYERS="16"
ENV GAMEMODE="sandbox"
ENV MAP="gm_construct"
ENV PORT="27015"
ENV ARGS=""

# START THE SERVER
CMD ["/bin/bash","-lc","touch /app/server/garrysmod/console.log && tail -F /app/server/garrysmod/console.log & exec /app/server/srcds_linux -game garrysmod -console -strictportbind -port ${PORT} -maxplayers ${MAXPLAYERS} +gamemode ${GAMEMODE} +map ${MAP} ${ARGS}"]