生成网卡ifconfig ens34 192.168.254.195重启后失效（与桥接的物理机网段相同即可）
首先查询网卡mac地址00:50:56:20:79:c8
bash-4.2# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 00:50:56:20:79:c8 brd ff:ff:ff:ff:ff:ff
inet 192.168.254.195/24 brd 192.168.254.255 scope global ens34
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe20:79c8/64 scope link
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:42:c5:e9 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:42:c5:e9 brd ff:ff:ff:ff:ff:ff
bash-4.2# ifconfig ens34 192.168.254.195
第二步找到与虚拟机桥接的物理机查询网关和网段并配置网卡注意ip不能冲突，同一网段即可。填写如下：
bash-4.2# vim ifcfg-ens34
DEVICE="ens34"
BOOTPBOTO="dhcp"
HWADDR="00:50:56:20:79:c8"
ONBOOT="yes"
TYPE="Ethernet"
IPADDR="192.168.254.195"
NETMASK="255.255.255.0"
GATEWAY="192.168.254.1"
第三步关键点是开启network时候要禁用NetworkManager，重新启动network
517 systemctl stop NetworkManager
518 systemctl disable NetworkManager
519 service network restart
配置DNS域名解析，不然解析不了百度域名
vim /etc/resolv.conf
nameserver 8.8.8.8
访问百度如下：
bash-4.2# ping www.baidu.com
PING www.a.shifen.com (119.75.217.109) 56(84) bytes of data.
64 bytes from 119.75.217.109 (119.75.217.109): icmp_seq=1 ttl=53 time=39.6 ms
64 bytes from 119.75.217.109 (119.75.217.109): icmp_seq=2 ttl=53 time=41.5 ms
64 bytes from 119.75.217.109 (119.75.217.109): icmp_seq=3 ttl=53 time=39.8 ms
自己的小经验希望对大家有帮助