KVM设置克隆虚拟机的网络实例教程

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