使用NAT模式的虚拟centos, 只显示两个网卡,无法连接外网,

输入systemctl start network后报错信息"

Restarting network (via systemctl): Job for network.service failed because the control process exited with error code.
See “systemctl status network.service” and “journalctl -xe” for details
禁掉系统自带的NetworkManager服务就可解决

systemctl stop NetworkManager # 停止NetworkManager服务
systemctl disable NetworkManager # 设置开机不启动
systemctl start network # 启动网络服务

或者

停掉NetworkManager
service NetworkManager stop
chkconfig NetworkManager off

重启网络
systemctl restart network