KVM克隆虚拟机后，需要设置虚拟机的网络，进入虚拟机后会发现没有eth0网卡，是因为虚拟机还使用原来的mac地址，需要修改之。
编辑/etc/udev/rules.d/70-persistent-net.rules文件，把NAME="eth0"的那行配置注释掉或者删掉，把NAME="eth1"的修改成NAME="eth0"，修改后如下：
# 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 0x1af4:0x1000 (virtio-pci)#SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:56:28:68", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"# PCI device 0x1af4:0x1000 (virtio-pci)SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:12:41:cd", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
更改网卡配置文件/etc/sysconfig/network-scripts/ifcfg-eth0，将HWADDR的值修改为/etc/udev/rules.d/70-persistent-net.rules文件中的新值，修改后如下：
# cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0"BOOTPROTO="none"HWADDR="52:54:00:12:41:cd"IPV6INIT="yes"IPV6_AUTOCONF="yes"NM_CONTROLLED="yes"ONBOOT="yes"TYPE="Ethernet"UUID="49d231f8-c5c4-40cd-8ebb-2c0b2d7a7864"IPADDR="172.16.101.12"PREFIX="16"GATEWAY="172.16.0.254"DNS1="172.20.1.4"DNS2="180.76.76.76"
重启系统。
注意：在克隆虚拟机时，好像virbr0会对虚拟机的网络有影响（我在没有关闭virbr0之前网络设置不成功，具体原因未知），可能需要关闭virbr0：
# virsh net-list # virsh net-destroy default # virsh net-undefine default# service libvirtd restart
