Dockerfile

FROM ubuntu:bionic

LABEL maintainer="Enes Sadık Özbek <es.ozbek.me>"

ENV DEBIAN_FRONTEND noninteractive
ENV GAME_INSTALL_DIR /home/steam/Unturned
ENV GAME_ID 1110390
ENV SERVER_NAME server
ENV STEAM_USERNAME anonymous
ENV STEAMCMD_DIR /home/steam/steamcmd

EXPOSE 27015
EXPOSE 27016

VOLUME ["$GAME_INSTALL_DIR"]

# Install required packages
RUN apt-get update && \
    apt-get install -y unzip tar curl coreutils lib32gcc1 libgdiplus && \
    apt-get clean -y && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# Add Steam user
RUN adduser \
	--home /home/steam \
	--disabled-password \
	--shell /bin/bash \
	--gecos "user for running steam" \
	--quiet \
	steam

USER steam
WORKDIR $STEAMCMD_DIR

RUN mkdir -p $GAME_INSTALL_DIR

# Install Unturned
RUN curl -s https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz | tar -vxz && \
    bash ./steamcmd.sh +force_install_dir $GAME_INSTALL_DIR +login $STEAM_USERNAME $STEAM_PASSWORD $STEAM_GUARD_TOKEN $STEAM_CMD_ARGS +@sSteamCmdForcePlatformBitness 64 +app_update $GAME_ID +quit && \
    mkdir -p /home/steam/.steam/sdk64/ && \
    cp -f linux64/steamclient.so /home/steam/.steam/sdk64/steamclient.so

WORKDIR $STEAMCMD_DIR

COPY init.sh .

ENTRYPOINT ["./init.sh"]