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self-hosting/minecraft/forge/Dockerfile

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# Copyright (C) 2020 Jef Roosens
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
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FROM openjdk:8-slim
# Build arguments
ARG MC_VERSION
ARG FORGE_VERSION
# Create worlds and config directory
WORKDIR /mc
RUN mkdir worlds config
# Download installer jar
ADD "https://files.minecraftforge.net/maven/net/minecraftforge/forge/${MC_VERSION}-${FORGE_VERSION}/forge-${MC_VERSION}-${FORGE_VERSION}-installer.jar" installer.jar
# Install forge & remove installer
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RUN java -jar installer.jar server --installServer && \
rm installer.jar installer.jar.log
# Forge doesn't use one single name, so this is needed to know the name of the executable
ENV FORGE_JAR="forge-${MC_VERSION}-${FORGE_VERSION}.jar"
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# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
VOLUME /mc/config/cache
WORKDIR /mc/config
# Default value to keep users from eating up all ram accidentally
ENV XMS=4
# We copy over the server jar(s) as well to make the backup more reproducible to deploy
ENTRYPOINT mv -n /mc/*.jar /mc/*.json /mc/libraries /mc/config && \
echo "eula=true" > /mc/config/eula.txt && \
java \
-Xms"${XMS}G" \
-Xmx"${XMX:-$XMS}G" \
-XX:+UseG1GC \
-XX:+ParallelRefProcEnabled \
-XX:MaxGCPauseMillis=200 \
-XX:+UnlockExperimentalVMOptions \
-XX:+DisableExplicitGC \
-XX:+AlwaysPreTouch \
-XX:G1NewSizePercent="$([ $XMS -gt 12 ] && echo 40 || echo 30)" \
-XX:G1MaxNewSizePercent="$([ $XMS -gt 12 ] && echo 50 || echo 40)" \
-XX:G1HeapRegionSize="$([ $XMS -gt 12 ] && echo 16 || echo 8)"M \
-XX:G1ReservePercent="$([ $XMS -gt 12 ] && echo 15 || echo 20)" \
-XX:G1HeapWastePercent=5 \
-XX:G1MixedGCCountTarget=4 \
-XX:InitiatingHeapOccupancyPercent="$([ $XMS -gt 12 ] && echo 20 || echo 15)" \
-XX:G1MixedGCLiveThresholdPercent=90 \
-XX:G1RSetUpdatingPauseTimePercent=5 \
-XX:SurvivorRatio=32 \
-XX:+PerfDisableSharedMem \
-XX:MaxTenuringThreshold=1 \
-Dusing.aikars.flags=https://mcflags.emc.gs \
-Daikars.new.flags=true \
-jar "$FORGE_JAR" \
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--universe /mc/worlds \
--nogui