systemd cheat sheets

systemctl_cheat_sheet.txt

# reload the systemd deamon config files (useful for testing once you have made a change)
systemctl daemon-reload

# list all unit configuration files found in the search paths.
systemctl list-unit-files

# list units with descriptions which are currently loaded into memory
systemctl list-units

# lists units with additional information
systemctl list-units --all

# list failed services
systemctl list-units --type=service --state=failed

# list failed - generic
systemctl --failed

# list running services
systemctl list-units --type=service --state=running

# list enabled services
systemctl list-unit-files --type=service --state=enabled 

# display enabled /disabled status of single unit
systemctl is-enabled <servicename>
  output explanation - enabled   :  service is enabled and set to start at boot
                     - disabled  :  service is disabled and won't start at boot
                     - static    :  service is enabled but will not start at boot

# display active / inactive status of single unit
systemctl is-enabled <servicename>
  output explanation - active
                     - inactive

# find the paths of installed unit files using the locate command (may require install of plocate)
locate '*.service'

# find the paths of installed unit files within /etc/ and /var/ using the find command (may be slower)
find /etc /var -type f -name '*.service'

systemd_boot_time_cheatsheet.txt

# list how long boot takes
systemd-analyze

# show which parts take how long to boot
systemd-analyze blame

systemd_unit_override_cheatsheet.txt

# show the path the actual overide file : 
systemctl show --property=DropInPaths <unit-name>

# show all set values for a unit : 
systemctl show <unit-name>

# edit the overide file for a unit
sudo systemctl edit <unit-name>

# reload the systemd datrabase after editing overide files 
systemctl daemon-reload

unit_files_cheatsheet.txt

[Unit]

# require another unit 
Requires=<unit.target>

# specify the order
After=<unit.target>
Before=<unit.target>

# ---------------------------------------------

[Service]
# Restart on failure with a delay
Restart=on-failure
RestartSec=10   # Set the delay in seconds


[Service]
# Startup delay
ExecStartPre=/bin/sleep 10