Systemd

Commands and Locations

• custom services are stored here: /etc/systemd/system
• analyse security of service unit: systemd-analyze security <service_unit>
• restart a service: systemctl restart <application_name>.service
• show logs of a service: journalctl -u <application_name>.service

List Services

• list enabled services: systemctl list-unit-files --state=enabled
• list running services: systemctl list-units --type=service
• list failed services: systemctl --failed
• list timers: systemctl list-timers

List all since boot

• all boot cycles: journalctl -k -b all
• current boot : journalctl -k
• last boot: journalctl -k -b -1
• two boots prior: journalctl -k -b -2
• and so on

Journal

• delete old journal files (ony keep last 2 days): journalctl --vacuum-time=2d