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# Minecraft Server Manager - systemd service file
# Develop by ZEN, Anemys and isnubi
# Made by Club*Nix with <3

[Unit]
Description=Minecraft Server: %i
After=network.target

[Service]
Type=simple
WorkingDirectory=/opt/minecraft/%i

# Users Database is not available from within the unit, only root and minecraft is available, everybody else is nobody
PrivateUsers=true

# Read only mapping of /usr /boot and /etc
ProtectSystem=full

# /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).
ProtectHome=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.
ProtectKernelTunables=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
ProtectKernelModules=true

# It is hence recommended to turn this on for most services
ProtectControlGroups=true

# Set default memory values
Environment=MCMINMEM=1G
Environment=MCMAXMEM=2G
Environment=JAR_NAME=server.jar
Environment=JAVA_OPTIONS=

# Change memory values in environment file
EnvironmentFile=-/opt/minecraft/%i/server.conf

# User and group the process will run as
User=minecraft
Group=minecraft

# Restart the process if it crashes after 15 seconds
Restart=on-failure
RestartSec=15s

SuccessExitStatus=143

ExecStart=/usr/bin/sh -c "/opt/minecraft/%i/java -Xms${MCMINMEM} -Xmx${MCMAXMEM} ${JAVA_OPTIONS} -jar ${JAR_NAME} --nogui"

ExecReload=/usr/bin/sh -c "/opt/minecraft/bin/manage.sh -m reload -s %i"

ExecStop=/usr/bin/sh -c "/opt/minecraft/bin/manage.sh -m stop -s %i"

[Install]
WantedBy=multi-user.target

# Service made using https://linuxconfig.org/ubuntu-20-04-minecraft-server-setup#h1-install-prerequisites
# Improved using https://minecraft.fandom.com/wiki/Tutorials/Server_startup_script and https://www.liquidweb.com/kb/how-to-create-a-minecraft-server/