PaperMC systemd service template

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

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

# Solves the issue where the minecraft server will endlessly restart itself
# See https://askubuntu.com/questions/953920/systemctl-service-timed-out-during-start for more info
Type=forking

#PrivateUsers=true
# Users Database is not available from 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
#ReadWritePaths=/tmp

#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

CPUQuota=90%

# Set default memory values
Environment="MCMINMEM=512M" "MCMAXMEM=1024M" "SHUTDOWN_DELAY=5" "POST_SHUTDOWN_DELAY=10"
# Change memory values in environment file
EnvironmentFile=-/opt/minecraft/%i/server.conf

# Uncomment this to fix screen on RHEL 8
#ExecStartPre=+/bin/sh -c 'chmod 777 /run/screen'

# Simplified of alternative
ExecStart=/usr/bin/tmux new-session -s mc-%i -d '/usr/bin/java -server -XX:+AlwaysPreTouch -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:MaxInlineLevel=15 -Xmx${MCMAXMEM} -Xms${MCMINMEM} -jar server.jar --nogui'
ExecStop=/usr/bin/tmux send -t mc-%i 'stop' ENTER

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
#
# To change specific server memory assignment, create file /opt/minecraft/XX/server.conf (where XX is your server name) and add below lines:
# MCMINMEM=512M
# MCMAXMEM=2048M