Variables

Unit

• After=network.target

• Executes after the internet drivers

• Type=simple

• Execution type, simple -> no fork the service is considerated as running after execution use for infinite program execution, oneshot -> the service is only finished when the program/script is finished

Services

• User=myuser

• Will be executed by the user

• WorkingDirectory=/path/to/directory

• Directroy that will be executed

• Restart=always/on-failure

• Restart policy (always/on-failure)

• RestartSec=5s

• Time to restart

Run program after boot

• sudo vim /etc/systemd/system/myscript.service/

[Unit]
Description=This will run after Boot

[Service]
Type=simple
ExecStart=program/location

[Install]
WantedBy=multi-user.target

• systemctl enable myscript.service

Timer execution

• sudo vim /etc/systemd/system/customscript.service

[Unit]
Description=My custom script

[Service]
Type=oneshot
ExecStart=/usr/local/bin/custom_script.sh

• sudo vim /etc/systemd/system/mytimer.timer

Periodic

[Unit]
Description=My custom timer that will exec every 1 hour

[Timer]
OnBootSec=5min
OnUnitActiveSec=1h
Persistent=true

[Install]
WantedBy=timers.target

Calendar

[Unit]
Description=My custom timer that will exec all tuesday 8 pm

[Timer]
OnCalendar=Tue 20:00:00
Persistent=true

[Install]
WantedBy=timers.target

• sudo systemctl enable --now mytimer.timer