Systemctl
systemctl command is a tool to control system services. It replaces the older command service
Usage Syntax¶
systemctl start|stop|status servicename.service
systemctl enable servicename.service
systemctl restart|reload servicename.service
systemctl list-units --all
- Show all running services:
systemctl status
- List failed units:
systemctl --failed
- Start/Stop/Restart/Reload a service:
systemctl start|stop|restart|reload unit
- Show the status of a unit:
systemctl status unit
- Enable/Disable a unit to be started on bootup:
systemctl enable|disable unit
- Mask/Unmask a unit to prevent enablement and manual activation:
systemctl mask|unmask unit
- Reload systemd, scanning for new or changed units:
systemctl daemon-reload
- Check if a unit is enabled:
systemctl is-enabled unit
The output has following columns :
-
UNIT : The
systemdunit name -
LOAD : Whether the unit's configuration has been parsed by
systemd. The configuration of loaded units is kept in memory. -
ACTIVE : A summary state about the unit is active.
-
SUB : This is a lower-level state that indicates more detailed information about the unit.
-
DESCRIPTION : A short textual description of what the unit is/does
Usage Examples¶
- To see status of Bluetooth
systemctl status bluetooth
Output
bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; preset: enabled)
Active: active (running) since Sat 2023-05-27 15:09:13 IST; 20h ago
Docs: man:bluetoothd(8)
Main PID: 1067 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 18163)
Memory: 2.7M
CPU: 153ms
CGroup: /system.slice/bluetooth.service
└─1067 /usr/libexec/bluetooth/bluetoothd
-
To stop the Bluetooth
systemctl stop bluetooth -
To disable at boot
systemctl disable bluetooth
Add a service under systemctl management¶
Inorder to add a service, create a unit file in /etc/systemd/system/servicename.service
where servicename.service is the name of service to be added.
To control system with systemctl¶
systemctl poweroffsystemctl haltsystemctl reboot