Custom systemd Unit and Unit File
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Overview
This article describes the procedure to configure an arbitrary service minecraft to be managed by systemd. It includes the creation of corresponding unit file and systemd configuration to start and stop the service automatically at boot, respectively shutdown.
Create the Unit File
Create the /etc/systemd/system/minecraft.service unit file. As root:
touch /etc/systemd/system/minecraft.service
chmod 644 /etc/systemd/system/minecraft.service
For more details on the location of the unit files, see:
Configure the Unit File
Process Started and Stopped by Auxiliary Scripts
This is common for Java programs, /home/minecraft/minecraft-server/minecraft is a wrapper script that starts the JVM and puts in background like this:
java -server -jar ... > $(dirname $0)/logs/stdout-and-sterr.log 2>&1 &
The unit file configuration is similar to:
[Unit]
Description=Minecraft service
After=network.target
[Service]
Type=oneshot
ExecStart=/home/minecraft/minecraft-server/minecraft start
ExecStop=/home/minecraft/minecraft-server/minecraft stop
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target
Also see:
Daemon Process that Forks and Creates Its Own PID File
[Unit]
Description=MyService
After=network.target
[Service]
ExecStart=/opt/myservice/bin/myservice
Type=forking
PIDFile=/var/run/myservice.pid
[Install]
WantedBy=multi-user.target
Also see:
Notify systemd of the Existence of the New Unit File
systemctl daemon-reload
Enable at Boot
systemctl enable myservice.service
Exercise the Service
systemctl start myservice systemctl status hello systemctl restart hello systemctl stop hello