一、情况说明
centos8的网卡服务与centos7有所不同，无法通过systemctl或者service命令重启网卡。centos8网卡服务由nmcli进行管理。
[root@centos8 network-scripts]# systemctl restart network Failed to restart network.service: Unit network.service not found. [root@centos8 network-scripts]# service network restart Redirecting to /bin/systemctl restart network.service Failed to restart network.service: Unit network.service not found.
二、网卡配置
1、进入网卡配置目录
[root@centos8 ~]# cd /etc/sysconfig/network-scripts/ [root@centos8 network-scripts]# ll total 4 -rw-r–r--. 1 root root 366 Mar 4 22:35 ifcfg-ens33
2、编辑网卡配置文件
[root@centos8 network-scripts]# vim ifcfg-ens33
将BOOTPROTO参数由dhcp改为static，根据需要配置IP地址、掩码、网关、DNS等信息
BOOTPROTO=static IPADDR=192.168.0.127 NETMASK=255.255.255.0 GATEWAY=192.168.0.1 DNS1=114.114.114.114
3、重载网卡配置
[root@centos8 network-scripts]# nmcli c reload ens33
4、重启网卡
[root@centos8 network-scripts]# nmcli c up ens33 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)
5、验证网络
[root@centos8 network-scripts]# ping www.baidu.com PING www.a.shifen.com (183.232.231.174) 56(84) bytes of data. 64 bytes from localhost (183.232.231.174): icmp_seq=1 ttl=52 time=18.8 ms 64 bytes from localhost (183.232.231.174): icmp_seq=2 ttl=52 time=18.2 ms ^C — www.a.shifen.com ping statistics — 2 packets transmitted, 2 received, 0% packet loss, time 4ms rtt min/avg/max/mdev = 18.228/18.503/18.779/0.307 ms
三、nmcli命令管理网卡
1、查看网卡信息
[root@centos8 network-scripts]# nmcli connection NAME UUID TYPE DEVICE ens33 2cf75158-1e14-46c8-be85-b3d9cd0e8352 ethernet ens33 virbr0 9902a052-4775-434a-9531-62712a3be9c3 bridge virbr0
2、显示具体的网络接口信息
[root@centos8 network-scripts]# nmcli connection show ens33 connection.id: ens33 connection.uuid: 2cf75158-1e14-46c8-be85-b3d9cd0e8352 connection.stable-id: – connection.type: 802-3-ethernet connection.interface-name: ens33 connection.autoconnect: yes …
3、显示所有活动连接
[root@centos8 network-scripts]# nmcli connection show --active NAME UUID TYPE DEVICE ens33 2cf75158-1e14-46c8-be85-b3d9cd0e8352 ethernet ens33 virbr0 9902a052-4775-434a-9531-62712a3be9c3 bridge virbr0
4、添加一个网卡
[root@centos8 network-scripts]# nmcli connection add type ethernet con-name eth0 Connection ‘eth0’ (28f1b3d6-4f13-41a3-a809-1c82fd2f470f) successfully added.
5、删除一个网卡连接
[root@centos8 network-scripts]# nmcli connection delete virbr0 Connection ‘virbr0’ (9902a052-4775-434a-9531-62712a3be9c3) successfully deleted.
6、给添加一个IP（IPADDR）
[root@centos8 network-scripts]# nmcli connection modify eth0 ipv4.addresses 192.168.10.100
7、给xxx添加一个子网掩码（NETMASK）
[root@centos8 network-scripts]# nmcli connection modify eth0 ipv4.addresses 192.168.10.100/24
8、添加一个ipv4
此处参数为+ipv4.addresses，即在此原来的配置上添加一个地址配置，无+则是在原来的基础上修改IP地址。
[root@centos8 network-scripts]# nmcli connection modify eth0 +ipv4.addresses 192.168.30.100/24
9、删除一个ipv4
[root@centos8 network-scripts]# nmcli connection modify eth0 -ipv4.addresses 192.168.20.100/24
10、添加DNS
[root@centos8 network-scripts]# nmcli connection modify eth0 +ipv4.dns 211.142.211.124
11、删除DNS
[root@centos8 network-scripts]# nmcli connection modify eth0 -ipv4.dns 114.114.114.114
12、添加一个网关（GATEWAY）
[root@centos8 network-scripts]# nmcli connection modify eth0 ipv4.gateway 192.168.0.1
13、使用nmcli重新回载网络配置
[root@centos8 network-scripts]# nmcli c reload
如果之前没有xxx的connection，则上一步reload后就已经自动生效了
14、重启网卡
[root@centos8 network-scripts]# nmcli c up ens33 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)
15、下线网卡
[root@centos8 network-scripts]# nmcli c down ens33
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原文链接：https://blog.csdn.net/carefree2005/article/details/114396600
