AlmaLinux 9
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Initial Settings : Configure Services2023/02/20

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

[root@dlp ~]#
systemctl -t service

  UNIT                               LOAD   ACTIVE SUB     DESCRIPTION         >
  atd.service                        loaded active running Deferred execution s>
  auditd.service                     loaded active running Security Auditing Se>
  chronyd.service                    loaded active running NTP client/server
  crond.service                      loaded active running Command Scheduler
  dbus-broker.service                loaded active running D-Bus System Message>
  dracut-shutdown.service            loaded active exited  Restore /run/initram>
  fprintd.service                    loaded active running Fingerprint Authenti>


  systemd-vconsole-setup.service     loaded active exited  Setup Virtual Console
  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.
45 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
arp-ethers.service                         disabled        disabled
atd.service                                enabled         enabled
auditd.service                             enabled         enabled
autovt@.service                            alias           -
blk-availability.service                   disabled        disabled
bolt.service                               static          -
chrony-wait.service                        disabled        disabled
chronyd.service                            enabled         enabled


usb_modeswitch@.service                    static          -
user-runtime-dir@.service                  static          -
user@.service                              static          -

194 unit files listed.
[2] Stop and turn OFF auto-start setting for a service if you don'd need it.
For example, disable [nis-domainname] as an example below.
[root@dlp ~]#
systemctl stop nis-domainname

[root@dlp ~]#
systemctl disable nis-domainname
# to disable and stop with a command, run like follows

[root@dlp ~]#
systemctl disable --now nis-domainname
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