因安装kvm虚拟化将网卡eth0作桥接配置当时正常，后来重启发现网卡起不来尚未到原因

# less ifcfg-br0 

DEVICE=br0

HWADDR=FC:15:B4:28:B9:30

#TYPE=Ethernet

UUID=43fc66da-809b-4006-845d-dbeff816fb9f

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=static

IPADDR=192.168.0.90

NETMASK=255.255.255.0

GATEWAY=192.168.0.254

DNS1=114.114.114.114

DNS2=223.5.5.5


# less ifcfg-eth0

DEVICE=eth0

HWADDR=FC:15:B4:28:B9:30

TYPE=Ethernet

#UUID=43fc66da-809b-4006-845d-dbeff816fb9f

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=static

#IPADDR=192.168.0.90

#NETMASK=255.255.255.0

#GATEWAY=192.168.0.254

BRIDGE=br0


#TYPE=Bridge