script

#!/bin/bash
# Source: https://github.com/agowa338/MinecraftSystemdUnit/
# License: MIT
[Unit]
Description=Minecraft Server %i
After=network.target

[Service]
WorkingDirectory=/opt/minecraft/%i
PrivateUsers=true
# Users Database is not available for within the unit, only root and minecraft is available, everybody else is nobody
User=minecraft
Group=minecraft
ProtectSystem=full
# Read only mapping of /usr /boot and /etc
ProtectHome=true
# /home, /root and /run/user seem to be empty from within the unit. It is recommended to enable this setting for all long-running services (in particular network-facing ones).
ProtectKernelTunables=true
# /proc/sys, /sys, /proc/sysrq-trigger, /proc/latency_stats, /proc/acpi, /proc/timer_stats, /proc/fs and /proc/irq will be read-only within the unit. It is recommended to turn this on for most services.
# Implies MountFlags=slave
ProtectKernelModules=true
# Block module system calls, also /usr/lib/modules. It is recommended to turn this on for most services that do not need special file systems or extra kernel modules to work
# Implies NoNewPrivileges=yes
ProtectControlGroups=true
# It is hence recommended to turn this on for most services.
# Implies MountAPIVFS=yes

ExecStart=/bin/sh -c '/usr/bin/screen -dmS mc-%i /usr/bin/java -server -DIReallyKnowWhatIAmDoingISwear -XX:ParallelGCThreads=4 -Xmx3G -Xms3G -jar bukkit-current.jar nogui'

ExecReload=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "reload"\\015'

ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "say SERVER SHUTTING DOWN. Saving map..."\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "save-all"\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "stop"\\015'
ExecStop=/bin/sleep 10

Restart=on-failure
#RestartSec=60s

[Install]
WantedBy=multi-user.target

#########
# HowTo
#########
#
# Create a directory in /opt/minecraft/XX where XX is a name like 'survival'
# Add minecraft_server.jar into dir with other conf files for minecraft server
#
# Enable/Start systemd service
#    systemctl enable minecraft@survival
#    systemctl start minecraft@survival
#
# To run multiple servers simply create a new dir structure and enable/start it
#    systemctl enable minecraft@creative
# systemctl start minecraft@creative