systemd cheat sheet

# Not Completed Yet

--------------------------------------------------------------------------------
WORKING WITH SERVICE
--------------------------------------------------------------------------------

systemctl stop servicename          # Stop a running service
systemctl start service             #Start a service
systemctl restart service           #Restart a running service
systemctl reload service            #Reload all config files in service
systemctl status service            #See if service is running/enabled
systemctl enable service            #Enable a service to start on boot
systemctl disable service           #Disable service--won’t start at boot
systemctl show service              #Show properties of a service (or other unit)
systemctl -H host status network    #Run any systemctl command remotely

--------------------------------------------------------------------------------
VIEW systemd INFORMATION
--------------------------------------------------------------------------------

systemctl list-dependencies         #Show a unit’s dependencies
systemctl list-sockets              #List sockets and what activates
systemctl list-jobs                 #View active systemd jobs
systemctl list-unit-files           #See unit files and their states
systemctl list-units                #Show if units are loaded/active
systemctl get-default               #List default target (like run level

--------------------------------------------------------------------------------
CHANGING SYSTEM STATES
--------------------------------------------------------------------------------

systemctl reboot                    #Reboot the system (reboot.target)
systemctl poweroff                  #Power off the system (poweroff.target)
systemctl emergency                 #Put in emergency mode (emergency.target)
systemctl default                   #Back to default target (multi-user.target

--------------------------------------------------------------------------------
VIEWING LOG MESSAGES
--------------------------------------------------------------------------------

journalctl                          #Show all collected log messages
journalctl -u network.service       #See network service messages
journalctl -f                       #Follow messages as they appear
journalctl -k                       #Show only kernel messages

### Need to add unit file options frome following

## Ref 1 : https://www.freedesktop.org/software/systemd/man/systemd.service.html
## Ref 2 : https://www.freedesktop.org/software/systemd/man/systemd.unit.html#
## Ref 3 : https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sect-Managing_Services_with_systemd-Unit_Files.html

### Reference

## Ref 1 : https://access.redhat.com/sites/default/files/attachments/rh_systemd_reference_card_0914_jcs_print_2.pdf