系统安装完成后
以此执行以下命令 相当于自动获取IP地址
setup命令——Network configuration———Device configuration———eth0 依次保存退出
实际上就是修改 /etc/sysconfig/network-scripts/ifcfg-eth0 的内容
TYPE=Ethernet
UUID=8f317ed7-9c85-4a67-bd89-a2b30ff86517
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=dhcp
USERCTL=no
PEERDNS=yes
IPV6INIT=no
一条命令修改ONBOOT=no
sed –I ‘s#ONB00T=no#ONBOOT=yes#g’ /etc/sysconfig/network-scripts/ifcfg-eth0
网卡重启 service network restart
关闭：ifdown eth0 开启：ifup eth0
期间我克隆了一个虚拟机 上述操作完成后 发现怎么都重启不了网卡，网上查了一些资料最后成功了 方法如下：
故障现象：
service network restart
Shutting down loopback insterface: [ OK ]
Bringing up loopback insterface: [ OK ]
Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [FAILED]
解决办法：
首先，打开/etc/udev/rules.d/70-persistent-net.rules内容如下面例子所示：
# vi /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:8f:89:9
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:50:bd:1
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
记录下，eth1网卡的mac地址00:0c:29:50:bd:17
接下来，打开/etc/sysconfig/network-scripts/ifcfg-eth0
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
将 DEVICE="eth0" 改成 DEVICE="eth1" ,
将 HWADDR="00:0c:29:8f:89:97" 改成上面的mac地址 HWADDR="00:0c:29:50:bd:17"
最后，重启网络
# service network restart
或者
# /etc/init.d/network restart
正常了。
原文地址：https://www.cnblogs.com/Mr-wx/p/8747581.html