Fedora 33
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初期設定 : サービスの設定2020/10/28

サービスの状態の確認や 有効化/無効化 は以下のように実行可能です。
[1] サービスの一覧を表示します。
# 稼働中のサービスの一覧

[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-userdbd.service            loaded active running User Database Manage>
  systemd-vconsole-setup.service     loaded active exited  Setup Virtual Consol>
  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.

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

# 全サービスの一覧

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

215 unit files listed.
[2] 不要なサービスを停止には以下のように実行します。例として、[smartd] を停止して、システムの起動時に自動的に起動しないように設定します。
[root@dlp ~]#
systemctl disable --now smartd