Fedora 34
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Initial Settings : Configure Services2021/04/28

To enable or disable services, Configure like follows.
[1] Display services list.
# the list of services that are active now

# to add [--all], display all included inactive servises

# to add [--no-pager], do not use pagers like [less/more]

[root@dlp ~]#
systemctl -t service

  UNIT                               LOAD   ACTIVE SUB     DESCRIPTION         >
  abrt-journal-core.service          loaded active running Creates ABRT problem>
  abrt-oops.service                  loaded active running ABRT kernel log watc>
  abrt-xorg.service                  loaded active running ABRT Xorg log watche>
  abrtd.service                      loaded active running ABRT Automated Bug R>
  atd.service                        loaded active running Deferred execution s>

  systemd-vconsole-setup.service     loaded active exited  Setup Virtual Console
  systemd-zram-setup@zram0.service   loaded active exited  Create swap on /dev/>
  user-runtime-dir@0.service         loaded active exited  User Runtime Directo>
  user@0.service                     loaded active running User Manager for UID>

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.
56 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# list of all services

[root@dlp ~]#
systemctl list-unit-files -t service

UNIT FILE                                  STATE           VENDOR PRESET
abrt-journal-core.service                  enabled         enabled
abrt-oops.service                          enabled         enabled
abrt-pstoreoops.service                    disabled        disabled
abrt-vmcore.service                        enabled         enabled
abrt-xorg.service                          enabled         enabled
abrtd.service                              enabled         enabled
arp-ethers.service                         disabled        disabled
atd.service                                enabled         enabled
auditd.service                             enabled         enabled


teamd@.service                             static          -
udisks2.service                            enabled         enabled
usb_modeswitch@.service                    static          -
user-runtime-dir@.service                  static          -
user@.service                              static          -

216 unit files listed.
[2] Stop and turn OFF auto-start setting for a service if you don'd need it.
The example below means stopping and disable smartd service.
[root@dlp ~]#
systemctl disable --now smartd

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