setup-minecraft-spigot-service.sh

#!/bin/bash
# Supports Minecraft Java Edition 1.17 version 1.17 and above
# Requirements Java 16 & git
set -eu

apt update
apt install -y jq

readonly MINECRAFT_DIR="/opt/minecraft_server"
readonly MINECRAFT_SERVER_SERVICE="/etc/systemd/system/minecraft-server.service"

readonly MINECRAFT_SERVER_LATEST_VER=$( curl https://launchermeta.mojang.com/mc/game/version_manifest.json | jq -r '."latest"."release"' )

groupadd minecraft || true
useradd -g minecraft minecraft || true

apt install -y screen

chown -R minecraft:minecraft ${MINECRAFT_DIR}

cat >> ${MINECRAFT_SERVER_SERVICE} <<EOF
[Unit]
Description=Minecraft Server
After=network.target
[Service]
WorkingDirectory=${MINECRAFT_DIR}
User=minecraft
Group=minecraft
ProtectSystem=full
ProtectHome=true
ExecStart=/bin/sh -c '/usr/bin/screen -DmS minecraft /usr/bin/java -server -Xms512M -Xmx1024M -XX:+UseG1GC -XX:ParallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -jar ${MINECRAFT_DIR}/spigot-${MINECRAFT_SERVER_LATEST_VER}.jar --forceUpgrade nogui'
ExecReload=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "reload"\\015'
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTTING DOWN. Saving map..."\\015'
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "save-all"\\015'
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "stop"\\015'
ExecStop=/bin/sleep 5
Restart=on-failure
RestartSec=60s
[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable --now minecraft-server.service

echo "minecraft-server.service enabled"