centos 7：network: 正在打开接口 ens33： 错误：激活连接失败：No suitable device found for this connection.

mar 11 10:18:18 localhost systemd: starting lsb: bring up/down networking...
mar 11 10:18:19 localhost network: 正在打开环回接口： [  确定  ]
mar 11 10:18:19 localhost networkmanager[9366]: <info>  [1552270699.1055] audit: op="connection-activate" uuid="fd005f04-41ac-4401-bd27-decd3492dd84" name="ens33" result="fail" reason="no suitable device found for this connection."
mar 11 10:18:19 localhost network: 正在打开接口 ens33： 错误：激活连接失败：no suitable device found for this connection.
mar 11 10:18:19 localhost network: [失败]
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost network: rtnetlink answers: file exists
mar 11 10:18:19 localhost systemd: network.service: control process exited, code=exited status=1
mar 11 10:18:19 localhost systemd: failed to start lsb: bring up/down networking.
mar 11 10:18:19 localhost systemd: unit network.service entered failed state.
mar 11 10:18:19 localhost systemd: network.service failed.

解决办法：

1. 如果新加网卡或者克隆虚拟机，可能是 mac 地址不对，使用 ip addr 查看mac地址

• • 永久修改：

然后把  /etc/sysconfig/network-scripts/ifcfg-ens33（macaddr） 或者 /sys/class/net/ens33/address

• • 临时修改：

#ifconfig eth0 down /*禁掉eth0网卡，这里以eth0网卡为例*/

#ifconfig eth0 hw ether 00:aa:bb:cc:dd:ee /*修改eth0网卡的mac地址*/

#ifconfig eth0 up   /*重新启动eth0网卡*/

        2. mac 没问题，关闭系统的 networkmanager ， 注意大小写