Refactor image, Java sourcing, and add entrypoint
- Moved to debian-slim base image to minimize size - Transitioned to Adoptium APT repos for flexibility in Java versions - Added an entrypoint script that configures EULA and server settings - Run server in resumable screen for console access in the container
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2
.gitignore
vendored
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2
.gitignore
vendored
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data
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.env
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88
Dockerfile
88
Dockerfile
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FROM debian:stable
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FROM debian:stable-slim
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ENV VERSION=1.20.1
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ENV JVM_OPTS="-Xmx2G -Xms1G"
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ARG VERSION=latest
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ARG JAVA_VERSION=latest
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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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apt-get install -y curl default-jre jq && \
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apt-get clean && \
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rm -rf /var/lib/apt/lists/*
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# Create minecraft user
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RUN groupadd -g 1000 minecraft && \
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useradd -m -u 1000 -g 1000 -d /home/minecraft minecraft
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useradd -m -u 1000 -g 1000 -d /app minecraft
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# Create directory
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RUN mkdir /app && \
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chown minecraft:minecraft /app
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# Install scripting dependencies
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RUN apt-get update && \
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apt-get install -y curl gpg jq screen && \
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apt-get clean && \
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rm -rf /var/lib/apt/lists/*
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# Eclipse Adoptium DEB installer package
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RUN set -ux && \
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# Download the Eclipse Adoptium GPG key
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curl -s https://packages.adoptium.net/artifactory/api/gpg/key/public \
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| gpg --dearmor | tee /etc/apt/trusted.gpg.d/adoptium.gpg > /dev/null && \
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# Configure the Eclipse Adoptium apt repository
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VERSION_CODENAME="$(awk -F= '/^VERSION_CODENAME/{print $2}' /etc/os-release)" && \
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echo "deb https://packages.adoptium.net/artifactory/deb $VERSION_CODENAME main" \
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| tee /etc/apt/sources.list.d/adoptium.list
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# Install Adoptium Temurin (OpenJDK Distribution)
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RUN set -ux && \
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# Grab latest LTS version if not specified
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if [ "$JAVA_VERSION" = "latest" ]; then \
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JAVA_VERSION="$( \
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curl -s https://api.adoptium.net/v3/info/available_releases \
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| jq '.most_recent_lts' \
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)"; \
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fi && \
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# Install the Temurin version
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apt-get update && \
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apt-get install -y "temurin-${JAVA_VERSION}-jre" && \
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apt-get clean && \
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rm -rf /var/lib/apt/lists/*
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# Download files and run as user
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USER minecraft
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WORKDIR /app
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# Download and verify sha1sum for server.jar
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WORKDIR /app
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USER minecraft
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RUN set -ux; \
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RUN set -ux && \
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# Grab latest version if not specified
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if [ "$VERSION" = "latest" ]; then \
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VERSION="$( \
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curl -s https://launchermeta.mojang.com/mc/game/version_manifest.json \
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| jq -r '.latest.release' \
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)"; \
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fi && \
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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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| jq -r --arg id "$VERSION" '.versions[] | select(.id == $id) | .url' \
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| xargs curl -s | jq -r '.downloads.server' | tee "/tmp/dl.json" \
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| jq -r '.url' | xargs curl -s -o server.jar && \
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# Get SHA1 hash of server.jar and compare
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SHA1="$(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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@ -37,5 +65,21 @@ RUN set -ux; \
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exit 1; \
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fi
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# Generate initial settings
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RUN java -jar server.jar --initSettings --nogui
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# Back to root to copy the entrypoint in
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USER root
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WORKDIR /app
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# Copy in entrypoint script
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COPY entrypoint.sh /usr/local/bin/entrypoint.sh
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RUN chmod +x /usr/local/bin/entrypoint.sh
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# Run app as minecraft user
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USER minecraft
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WORKDIR /app
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# Expose port and run entrypoint script
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EXPOSE 25565
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CMD ["java", "-jar", "server.jar", "$JVM_OPTS", "--nogui"]
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ENTRYPOINT ["entrypoint.sh"]
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17
README.md
17
README.md
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# Minecraft Docker Image
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This Dockerfile sets up a Minecraft server based on the `debian-slim` image.
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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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By running the following and building this image, you are agreeing to
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[Minecraft's EULA](https://www.minecraft.net/en-us/eula):
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```
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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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echo "EULA=true" > .env
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```
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To build and test the image:
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```
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docker compose build
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docker compose up -d
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docker logs -f minecraft-minecraft-1
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```
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## Copyright and License
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24
docker-compose.yml
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24
docker-compose.yml
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volumes:
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minecraft:
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services:
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minecraft:
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build:
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context: .
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dockerfile: Dockerfile
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args:
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VERSION: ${VERSION:-latest}
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JAVA_VERSION: ${JAVA_VERSION:-latest}
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image: ${IMAGE:-minecraft}:${TAG:-latest}
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ports:
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- "0.0.0.0:25565:25565"
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#volumes:
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# - minecraft:/app/world
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environment:
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EULA: "${EULA:-false}"
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DEBUG: "${DEBUG:-false}"
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JVM_OPTS: "-Xms1G -Xmx2G"
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SETTINGS_gamemode: "${GAMEMODE:-survival}"
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SETTINGS_hardcore: "${HARDCORE:-false}"
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SETTINGS_motd: "${MOTD:-A Minecraft Server}"
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SETTINGS_pvp: "${PVP:-true}"
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59
entrypoint.sh
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59
entrypoint.sh
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#!/bin/bash
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# Enable debug mode
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DEBUG="${DEBUG:-false}"
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if [ "$DEBUG" = "true" ]; then
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echo "[DEBUG] Running entrypoint script at $(which entrypoint.sh)"
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sleep 0.2
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set -ux
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fi
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# Settings
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FILE="${FILE:-/app/server.properties}"
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EULAFILE="${EULAFILE:-/app/eula.txt}"
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PREFIX="${PREFIX:-SETTINGS_}"
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JVM_OPTS="${JVM_OPTS:--Xms1G -Xmx2G}"
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# Set EULA
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sed -i.bak "s/^eula=.*\$/eula=${EULA:-false}/" "$EULAFILE"
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diff --unified=1 "${EULAFILE}.bak" "$EULAFILE"
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rm "${EULAFILE}.bak"
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# Update server.properties using env
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while IFS='=' read -r ENVVAR VALUE ; do
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if echo "$ENVVAR" | grep -q "^${PREFIX}.*$"; then
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KEY="${ENVVAR#"$PREFIX"}"
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if ! grep -q "^${KEY}=" "$FILE"; then
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echo "[WARN]: \"$KEY\" does not exist in $FILE and was not updated"
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else
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[ "$DEBUG" = "true" ] && echo "[DEBUG] Updating \"$KEY\" to \"$VALUE\""
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sed -i.bak "s/^${KEY}=.*/${KEY}=${VALUE}/" "$FILE"
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diff --unified=1 "${FILE}.bak" "$FILE"
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rm "${FILE}.bak"
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fi
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else
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[ "$DEBUG" = "true" ] && \
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echo "[DEBUG] \"$ENVVAR\" doesn't have the prefix \"$PREFIX\""
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fi
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done < <(env)
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# Show server.properties in DEBUG mode
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if [ "$DEBUG" = "true" ]; then
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echo "[DEBUG] Showing ${FILE}:"
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cat "$FILE"
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fi
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# Pre-create the screen log
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touch screenlog.0
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# Run server in screen (without attaching)
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/usr/bin/screen -dmS minecraft -L \
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bash -c "
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sleep 0.5
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[ $DEBUG = true ] && echo '[DEBUG] Starting server'
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/usr/bin/java $JVM_OPTS -jar server.jar --nogui
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"
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# Tail screen log to container stdout
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[ "$DEBUG" = "true" ] && echo "[DEBUG] Tailing screenlog.0"
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tail -f screenlog.0
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