CentOSに挑戦する初心者の助けになればいいと思うサイト集 ref: https://qiita.com/ponsuke0531/items/c6fff1452537ad3709e6

file0.txt

# 一覧を見たい
$ systemctl list-unit-files --type=service
UNIT FILE                          STATE
{サービス}.service                  disabled

# 状態を確認したい
$ systemctl status {サービス}

file1.txt

# 自動起動を設定したい
$ chkconfig NetworkManager on
情報:'systemctl enable NetworkManager.service'へ転送しています。
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-unit-files ===
Authentication is required to manage system service or unit files.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===
Created symlink from /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service to /usr/lib/systemd/system/NetworkManager.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/NetworkManager.service to /usr/lib/systemd/system/NetworkManager.service.
Created symlink from /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service to /usr/lib/systemd/system/NetworkManager-dispatcher.service.
==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon ===
Authentication is required to reload the systemd state.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===

# 状態を確認する : 停止している時(●が黒色になる)
$ service NetworkManager status
Redirecting to /bin/systemctl status  NetworkManager.service
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)

# 状態を確認する : 起動している時(●が緑色になる)
$ service NetworkManager status
Redirecting to /bin/systemctl status  NetworkManager.service
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since 木 2017-07-13 22:00:27 JST; 4min 51s ago
     Docs: man:NetworkManager(8)
 Main PID: 2313 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           └─2313 /usr/sbin/NetworkManager --no-daemon

 7月 13 22:00:28 localhost.localdomain NetworkManager[2313]: <info>  [1499950828.0063] Loaded device plugin: NMEthernetF...nal)
<省略>
 7月 13 22:00:28 localhost.localdomain NetworkManager[2313]: <info>  [1499950828.0183] manager: startup complete
Hint: Some lines were ellipsized, use -l to show in full.

# サービスを起動する
$ service NetworkManager start
Redirecting to /bin/systemctl start  NetworkManager.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===

NetworkManagerのコマンド

# 自動起動を設定する
$ chkconfig NetworkManager on
情報:'systemctl enable NetworkManager.service'へ転送しています。
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-unit-files ===
Authentication is required to manage system service or unit files.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===
Created symlink from /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service to /usr/lib/systemd/system/NetworkManager.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/NetworkManager.service to /usr/lib/systemd/system/NetworkManager.service.
Created symlink from /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service to /usr/lib/systemd/system/NetworkManager-dispatcher.service.
==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon ===
Authentication is required to reload the systemd state.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===

# 状態を確認する : 停止している時(●が黒色になる)
$ service NetworkManager status
Redirecting to /bin/systemctl status  NetworkManager.service
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)
# 状態を確認する : 起動している時(●が緑色になる)
$ service NetworkManager status
Redirecting to /bin/systemctl status  NetworkManager.service
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since 木 2017-07-13 22:00:27 JST; 4min 51s ago
     Docs: man:NetworkManager(8)
 Main PID: 2313 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           └─2313 /usr/sbin/NetworkManager --no-daemon

 7月 13 22:00:28 localhost.localdomain NetworkManager[2313]: <info>  [1499950828.0063] Loaded device plugin: NMEthernetF...nal)
<省略>
 7月 13 22:00:28 localhost.localdomain NetworkManager[2313]: <info>  [1499950828.0183] manager: startup complete
Hint: Some lines were ellipsized, use -l to show in full.

# サービスを起動する
$ service NetworkManager start
Redirecting to /bin/systemctl start  NetworkManager.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: userName
Password: 
==== AUTHENTICATION COMPLETE ===