yum -y install qemu-kvm libvirt python-virtinst bridge-utils
cat /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
ONBOOT=yes
TYPE=Bridge
BOOTPROTO=dhcp
STP=on
DELAY=0
NM_CONTROLLED=no
cat /etc/sysconfig/network-scripts/ifcfg-em1
DEVICE=em1
HWADDR=XX:XX:XX:XX:XX:XX
ONBOOT=yes
BRIDGE=br0
TYPE=Ethernet
NM_CONTROLLED=no
systemctl stop NetworkManager.service
systemctl disable NetworkManager.service
chkconfig network on
service network start
reboot