通常的linux发行版对于网络的配置方法一般会同时支持network.service（即配置和使用/etc/sysconfig/network-scripts/下的配置文件来配置网络，对于ubuntu是/etc/network/interfaces等等）和NetworkManager.service（简称NM）。默认情况下，这2个服务都有开启，而且功能上是平行的，可以通过任意一个来配置网络，正常的情况下通过NM来配置网络后它会自动把配置同步到network.service的配置中。
nmcli修改connection name之后，会将connect name 写入到ifcfg-$ETH 文件里面去
nmcli> set connection.id bridge-network
nmcli> save persistent
Error: Failed to save 'bridge-network' (d3a182af-5e76-4835-b6c6-0e8db8b49d4e) connection: Could not read file '/etc/sysconfig/network-scripts/ifcfg-enp0s3': No such file or directory
nmcli> save persistent
Connection 'bridge-network' (d3a182af-5e76-4835-b6c6-0e8db8b49d4e) successfully updated.
[root@node4 network-scripts]# mv bak/ifcfg-enp0s3 .
[root@node4 network-scripts]#
[root@node4 network-scripts]# ls
bak ifdown-bnep ifdown-post ifdown-TeamPort ifup-eth ifup-plusb ifup-Team network-functions
ifcfg-enp0s3 ifdown-eth ifdown-ppp ifdown-tunnel ifup-ippp ifup-post ifup-TeamPort network-functions-ipv6
ifcfg-enp0s8 ifdown-ippp ifdown-routes ifup ifup-ipv6 ifup-ppp ifup-tunnel
ifcfg-lo ifdown-ipv6 ifdown-sit ifup-aliases ifup-isdn ifup-routes ifup-wireless
ifdown ifdown-isdn ifdown-Team ifup-bnep ifup-plip ifup-sit init.ipv6-global
[root@node4 network-scripts]# cat ifcfg-enp0s3
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=bridge-network
UUID=d3a182af-5e76-4835-b6c6-0e8db8b49d4e
DEVICE=enp0s3
ONBOOT=yes
##激活连接 nmcli connection up connection-name nmcli device connect interface-name
##取消激活链接 nmcli connection down connection-name ##这个操作当取消一个激活后，如果有其它连接会自动激活其它连接 nmcli device disconnect interface-name ##这个操作会取消接口上的激活，如果有其它连接也不会自动激活其它连接
nmcli connection add type ethernet con-name connection-name ifname interface-name ipv4.method manual ipv4.addresses address ipv4.gateway address
[root@Fedora ~]# nmcli device wifi //tab之后有list和connect
connect help hotspot list rescan
[root@Fedora ~]# nmcli device wifi list 再tab看到的不再重要了，回去
bssid hwaddr ifname --rescan
[root@Fedora ~]# nmcli device wifi list
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
Honor 8 Infra 6 65 Mbit/s 100 ▂▄▆█ WPA2
[root@Fedora ~]# nmcli device wifi connect //tab看到了我们想连接的热点
A4:71:74:00:11:43 Honor\ 8
[root@Fedora ~]# nmcli device wifi connect Honor\ 8 //tab后
bssid ifname password wep-key-type
hidden name private
＃连接网络要用到网卡的，ifname这个都认识吧
＃在输入ifname后再tab直接出wlp9s0，这是因为我的电脑就一个网卡
[root@Fedora ~]# nmcli device wifi connect Honor\ 8 ifname wlp9s0 //还差个密码呢
bssid ifname password wep-key-type
hidden name private
[root@Fedora ~]# nmcli device wifi connect Honor\ 8 ifname wlp9s0 password 12345678
Device 'wlp9s0' successfully activated with 'd31829c0-dfed-426f-be98-856892b589b4'.
＃这里的12345678是我手机热点的密码，不要搞错哦
因为没有安装bash-completion rpm包
solution: # yum -y install bash-completion, 重启bash