Starting and Stopping Services
sudo systemctl start application.service or
sudo systemctl start application
Restarting and Reloading
sudo systemctl restart application.service
if application has ability to reload its configuration files:
sudo systemctl reload application.service
universal command (if you don't know is there in application ability to reload):
sudo systemctl reload-or-restart application.service
Enabling and Disabling Services
systemctl enable application.service
systemctl disable application.service
Change the “runlevels”/targets after booting
systemctl isolate multi-user.target
Change the boot “runlevels”/targets
Runlevels - Targets
0 - poweroff.target
1 - rescue.target
2, 3, 4 - multi-user.target
5 - graphical.target
6 - reboot.target
Make “multi-user.target” the default “runlevel”
systemctl enable multi-user.target
systemctl set-default multi-user.target
Checking the Status of Services
systemctl status application.service
systemctl is-active application.service
systemctl is-enabled application.service
systemctl is-failed application.service
System State Overview
Listing Current Units
systemctl list-units
systemctl
systemctl list-units --all
Use the --state= flag to indicate the LOAD, ACTIVE, or SUB states
systemctl list-units --all --state=inactive
systemctl list-units --type=service
Listing All Unit Files
systemctl list-unit-files
Displaying Dependencies
systemctl list-dependencies sshd.service
Checking Unit Properties
systemctl show sshd.service
Shortcuts
systemctl rescue - put system into single-user mode
systemctl halt - will halt the system - meaning the system will shutdown and at the end stop at a screen with the last message beeing something like "System halted".
systemctl poweroff - will power off the system - meaning the system will shutdown and at the end power off (sends an ACPI command to the board, then to the PSU, to cut the power)
systemctl reboot - reboot the system
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