systemctl stop NetworkManger # 关闭网络服务

[root@192 ~]# systemctl get-default 
graphical.target

[root@192 ~]# systemctl set-default graphical.target 

chkconfig --list # 查询系统服务的运行级信息
chkconfig network off # 将network服务的开机自启动选项关闭
chkconfig network on # 将network服务的开机自启动选项开启
chkconfig --level 3 network off # 将运行级别3的network服务开启自启动选项关闭

[root@192 ~]# systemctl status NetworkManager # 查看networkmanager服务是否为开机自启动 enabled表示开机自启动
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)

[root@192 ~]# systemctl disable NetworkManager # 将networkmanager服务的自启动选项设置为关闭
# disable表示关闭，NetworkManger为服务名
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
Removed symlink /etc/systemd/system/network-online.target.wants/NetworkManager-wait-online.service.
[root@192 ~]# systemctl status NetworkManager # 再次查看状态。当前为disabled表示关闭状态
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)

 [root@192 ~]# systemctl enable NetworkManager # 将networkManger服务的开机自启动选项设置为开启
# enable表示开启，后者为服务名
[root@192 ~]# systemctl status NetworkManager # 再次查看状态。enabled表示开启
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)

[root@192 ~]# systemctl list-unit-files
UNIT FILE                                     STATE   
proc-sys-fs-binfmt_misc.automount             static  
dev-hugepages.mount                           static  
dev-mqueue.mount                              static  
proc-fs-nfsd.mount                            static  
proc-sys-fs-binfmt_misc.mount                 static  
run-vmblock\x2dfuse.mount                     disabled
sys-fs-fuse-connections.mount                 static  
sys-kernel-config.mount                       static  
sys-kernel-debug.mount                        static  
tmp.mount                                     disabled
var-lib-nfs-rpc_pipefs.mount                  static  
brandbot.path                                 disabled
cups.path                                     enabled 
systemd-ask-password-console.path             static  
systemd-ask-password-plymouth.path            static  
systemd-ask-password-wall.path                static  
session-2.scope                               static  
session-3.scope                               static  
session-6.scope                               static  
abrt-ccpp.service                             enabled 
abrt-oops.service                             enabled 

[root@192 ~]# systemctl stop firewalld.service  # 关闭防火墙，stop表示关闭，换成start表示开启
[root@192 ~]# systemctl status firewalld # 再次查看防火墙状态。inactive表示关闭
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since 二 2024-01-09 20:04:56 CST; 2s ago
     Docs: man:firewalld(1)
  Process: 757 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=exited, status=0/SUCCESS)
 Main PID: 757 (code=exited, status=0/SUCCESS)