Update the Dockerfile for readability
- Make the download/verify section more readable - Add JVM_OPTS to CMD - Use ARG EULA during the build - Update build instructions in README
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32
Dockerfile
32
Dockerfile
@ -1,9 +1,9 @@
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FROM debian:stable
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ENV DEBIAN_FRONTEND=noninteractive
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ENV VERSION=1.20.1
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ENV JVM_OPTS="-Xmx2G -Xms1G"
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ENV EULA=false
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ENV DEBIAN_FRONTEND=noninteractive
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ARG EULA=false
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# Install dependencies
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RUN apt-get update && \
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@ -21,17 +21,21 @@ RUN mkdir /app && \
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# Download and verify sha1sum for server.jar
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WORKDIR /app
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RUN curl -s https://launchermeta.mojang.com/mc/game/version_manifest.json \
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| jq -r --arg id "$VERSION" '.versions[] | select(.id == $id) | .url' | xargs curl -s \
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| jq -r '.downloads.server' | tee "/tmp/dl.json" | jq -r '.url' | xargs curl -s -o server.jar \
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&& sha1sum server.jar | awk '{print $1}' | xargs -I{} sh -c '[ "{}" = "$(jq -r .sha1 /tmp/dl.json)" ] && \
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(echo "Checksum matches" && rm /tmp/dl.json) || (echo "Checksum failed" && exit 1)' \
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&& chown minecraft:minecraft server.jar
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USER minecraft
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RUN set -ux; \
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# Get server.jar based on $VERSION
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curl -s https://launchermeta.mojang.com/mc/game/version_manifest.json \
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| jq -r --arg id "$VERSION" '.versions[] | select(.id == $id) | .url' | xargs curl -s \
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| jq -r '.downloads.server' | tee "/tmp/dl.json" | jq -r '.url' | xargs curl -s -o server.jar && \
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java -jar server.jar --initSettings --nogui && \
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sed -i "s/^eula=.*\$/eula=$EULA/" eula.txt && \
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# Get SHA1 hash of server.jar and compare
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SHA1="$(sha1sum server.jar | awk '{print $1}')" && \
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EXPECTED="$(jq -r .sha1 /tmp/dl.json)"; rm /tmp/dl.json && \
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if [ ! "$SHA1" = "$EXPECTED" ]; then \
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echo "[ERROR] SHA1=\"$SHA1\" expected \"$EXPECTED\""; \
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exit 1; \
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fi
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EXPOSE 25565
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# temp
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RUN echo 'eula=true' > eula.txt
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CMD ["java", "-jar", "server.jar", "nogui"]
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CMD ["java", "-jar", "server.jar", "$JVM_OPTS", "--nogui"]
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@ -4,7 +4,9 @@ This Dockerfile sets up a Minecraft server based on Debian stable. WIP.
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To test image creation, run:
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```
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docker build . -t minecraft:vanilla; docker run -d minecraft:vanilla
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docker build --build-arg EULA=true -t minecraft . && \
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docker run -d --name minecraft --rm minecraft && \
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docker logs -f minecraft
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```
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## Copyright and License
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