Ubuntu 22.04 LTS: Manage Services

Initial Settings

This section explain how to manage services like see services status or enable/disable services, Configure like follows.

Step [1] Display services.

# display services which are running
# to add [--all], display all included inactive servises
# to add [--no-pager], do not use pagers like [less/more]
root@bizantum:~# systemctl -t service
  UNIT
  accounts-daemon.service
  apparmor.service
  apport.service
  blk-availability.service
  cloud-config.service
  cloud-final.service
  
.....
.....

  unattended-upgrades.service
  user-runtime-dir@1000.service
  user@1000.service

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
55 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# display list of all services' setting
root@bizantum:~# systemctl list-unit-files -t service
UNIT FILE                              STATE           VENDOR PRESET
apparmor.service                       enabled         enabled
apport-autoreport.service              static          -
apport-forward@.service                static          -
apport.service                         generated       -
apt-daily-upgrade.service              static          -
apt-daily.service                      static          -
autovt@.service                        alias           -
blk-availability.service               enabled         enabled
bolt.service                           static          -

.....
.....

vmtoolsd.service                       alias           -
x11-common.service                     masked          enabled
xfs_scrub@.service                     static          -
xfs_scrub_all.service                  static          -
xfs_scrub_fail@.service                static          -

207 unit files listed.

Step [2] If there are some unnecessary services, it's possible to Stop and turn OFF auto-start setting like follows. (possible to omit [.service] words).

root@bizantum:~# systemctl stop apparmor
root@bizantum:~# systemctl disable apparmor