Some improvements

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     build: 
       context: ./minecraft
       args: 
-        MINECRAFT_VERSION: 1.21.1
+        MINECRAFT_VERSION: 1.21.11
     volumes:
       - ./minecraft-data:/minecraft-server/data
     ports:

minecraft/Dockerfile

@@ -1,12 +1,29 @@
 FROM alpine:latest
-RUN mkdir /minecraft-server/jar -p
-RUN apk add openjdk17-jre-headless
-COPY versions.csv /minecraft-server/jar/versions.csv
+
+WORKDIR /minecraft-server
+
+RUN apk add --no-cache openjdk21-jre-headless wget jq
+
 ARG MINECRAFT_VERSION
-ENV MINECRAFT_VERSION ${MINECRAFT_VERSION}
-RUN wget $(awk -v ref="$MINECRAFT_VERSION" -F','  ' $1 == ref  { print substr($2, 1, length($2)-1) }' /minecraft-server/jar/versions.csv) -O server.jar
-RUN mv server.jar /minecraft-server/jar
+ENV MINECRAFT_VERSION=${MINECRAFT_VERSION}
+
+# Mit jq ist JSON-Parsing trivial
+RUN echo "Downloading Minecraft Server $MINECRAFT_VERSION..." && \
+    wget -q https://piston-meta.mojang.com/mc/game/version_manifest_v2.json -O /tmp/manifest.json && \
+    VERSION_URL=$(jq -r ".versions[] | select(.id==\"$MINECRAFT_VERSION\") | .url" /tmp/manifest.json) && \
+    echo "Found version URL: $VERSION_URL" && \
+    test -n "$VERSION_URL" || (echo "ERROR: Version $MINECRAFT_VERSION not found!"; exit 1) && \
+    wget -q "$VERSION_URL" -O /tmp/version.json && \
+    SERVER_URL=$(jq -r '.downloads.server.url' /tmp/version.json) && \
+    echo "Downloading server JAR: $SERVER_URL" && \
+    mkdir -p jar && \
+    wget "$SERVER_URL" -O /minecraft-server/jar/server.jar && \
+    rm /tmp/*.json && \
+    echo "Download complete!"
+
 WORKDIR /minecraft-server/data
 COPY entrypoint.sh /minecraft-server/jar/entrypoint.sh
 RUN chmod +x /minecraft-server/jar/entrypoint.sh
-ENTRYPOINT [ "/minecraft-server/jar/entrypoint.sh","java -jar /minecraft-server/jar/server.jar"]
+
+ENTRYPOINT ["/minecraft-server/jar/entrypoint.sh"]
+CMD ["java", "-Xmx2G", "-Xms1G", "-jar", "/minecraft-server/jar/server.jar", "nogui"]