默认centos和redhat7都是不启用有线网卡的,要么手动开启,要么安装时直接启用(安装时启用网卡和指定IP最省事)!
一 、临时启用网卡,关机或重启后,网络不会自动开启
1、使用命令 ip addr,查看网卡的IP
1 #ip addr
2 1: lnk/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
3 inet 127.0.0.1/8scope host lo4 valid_lft forever preferred_lft forever5 inet6 ::1/128scope host6 valid_lft forever preferred_lft forever7 2: enp2s1: mtu 1500 qdisc mq state UP group default qlen 1000
8 link/ether 00:17:08:49:9d:c5 brd ff:ff:ff:ff:ff:ff
2、对于没有启用的网卡,使用命令ifup,开启网卡。注意网卡的名称
#ifup enp2s1
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3)
3、可以再次查看IP,可以看到已经自动分配到了IP,这里的路由器开启了自动获取Ip,所以不需要手动设置Ip。
#ip addr
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127