Systemctl

systemctl command is used to control the systemd system and service manager.

Basic Usage

• /systemctl status/
• systemctl list-units
  • systemctl list-units --all
  • systemctl list-units --failed
  • systemctl list-units --type=service
• List services: /systemctl list-unit-files/
• List services enabled: systemctl list-unit-files --state=enabled
• View status of a service: systemctl status docker
• Show properties: systemctl show sshd.service
• View dependencies: systemctl list-dependencies sshd.service
• Creating new services in: /etc/systemd/system/ https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/sect-managing_services_with_systemd-unit_files
• systemctl -t mount
• systemctl list-units -t mount
• systemctl enable FS_UNIT_NAME.mount
• sudo systemctl enable --now snapd.socket

Activities

Basic

• Read systemd Cheat-sheet: https://www.linuxtrainingacademy.com/systemd-cheat-sheet/
• Enable or disable Automatic updates in your Ubuntu machine

Advanced

• Read Why are reboot, shutdown and poweroff symlinks to systemctl?: https://unix.stackexchange.com/questions/77029/why-are-reboot-shutdown-and-poweroff-symlinks-to-systemctl/77030#77030
• Create a service that restart on-failure. https://superuser.com/questions/507576/how-to-automatically-restart-a-linux-background-process-if-it-fails

See also

• journalctl

https://www.freedesktop.org/software/systemd/man/systemctl.html

https://www.linuxtrainingacademy.com/systemd-cheat-sheet/