docker-minecraft/Dockerfile

# The first stage just builds up the modpack
FROM alpine:latest AS build

# Args
ARG MINECRAFT_VERSION="1.16.5"
ARG FORGE_VERSION="36.1.4"

# The actual setup work
COPY start-server.sh /minecraft/start-server.sh
WORKDIR /minecraft
RUN apk add curl openjdk8-jre &&\
	curl -L "https://files.minecraftforge.net/maven/net/minecraftforge/forge/${MINECRAFT_VERSION}-${FORGE_VERSION}/forge-${MINECRAFT_VERSION}-${FORGE_VERSION}-installer.jar" -o installer.jar &&\
	java -jar installer.jar --installServer &&\
	echo "eula=true" > eula.txt &&\
	rm installer.jar installer.jar.log && \
	ln -s "forge-${MINECRAFT_VERSION}-${FORGE_VERSION}.jar" server.jar

# The second stage is the actual container
FROM openjdk:8
RUN apt-get update && apt-get install rsync -y
WORKDIR /minecraft
COPY --from=build /minecraft .
CMD [ "bash", "start-server.sh" ]
EXPOSE 25565