一、 kvm安装
简单的方法：yum install kvm
二、libvirt安装及升级
（1） yum install libvirt libvirt-python -y
（2）默认版本是0.8.1，功能很少，可升级到最新
wget ftp://libvirt.org/libvirt/libvirt-0.9.4.tar.gz
tar xzvf libvirt-0.9.4.tar.gz
cd libvirt-0.9.4
./configure
以下是大部分可能出现的情况，如果已有安装某些包，可能不需要操作
1 gcc编译器没有安装
yum -y install gcc gcc-c++
2 libxml2 xml2-config >= 2.6.0 ... configure: error: Could not find libxml2 anywhere (see config.log for details).
yum install libxml2-devel
//yum install xml2-* 这个不一定需要
3 configure: error: You must install the GnuTLS library in order to compile and run libvirt
yum install gnutls-devel
4 configure: error: You must install device-mapper-devel/libdevmapper >= 1.0.0 to compile libvirt
yum install device-mapper-devel
5 You must install python-devel to build Python bindings
yum install python-devel
6 configure: error: libnl-devel >= 1.1 is required for macvtap support
yum install libnl-devel
至此./configure应该可以通过。懒人就用这个 yum install libxml2-devel gnutls-devel device-mapper-devel python-devel libnl-devel -y
（3）make && make install
重启libvirtd
service libvirtd restart
可能会报错：
1 error: Failed to connect socket to '/usr/local/var/run/libvirt/libvirt-sock': No such file or directory
做个链接：
ln -s /var/run/libvirt/libvirt-sock /usr/local/var/run/libvirt/libvirt-sock
2 libvirt: Remote error : unable to connect to '/usr/local/var/run/libvirt/libvirt-sock-ro': No such file or directory”
再做个链接
ln -s /var/run/libvirt/libvirt-sock-ro /usr/local/var/run/libvirt/libvirt-sock-ro
三、服务器网络配置-桥接，目的是使虚拟机通信方便
使用桥接模式，以centos上运行ubuntu虚拟机的网络配置为例
cd /etc/sysconfig/network-scripts
cp ifcfg-eth0 ifcfg-br0 //复制后修改
修改 ifcfg-eth0为如下内容
DEVICE=eth0
HWADDR=00:E0:81:D2:7A:F1 //视具体情况定
ONBOOT=yes
BRIDGE=br0
修改ifcfg-br0为如下内容
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
IPADDR=10.88.0.27
NETMASK=255.255.255.0
GATEWAY=10.88.0.1
ONBOOT=yes
重启网络服务 service network restart
如果有双网卡，并且需要配置两个IP，则可以使用同样地方法为eth1建一个Bridge。