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
原文：https://www.cnblogs.com/robertx/p/10656874.html