今天用xshell连接虚拟机时死活连不上，检查来检查去都没问题，结果居然是....

1. 使用检查network.service 状态时：

network.service - LSB: Bring up/down networkingLoaded: loaded (/etc/rc.d/init.d/network)Active: failed (Result: exit-code) since 三 2016-08-17 11:34:36 CST; 54s agoDocs: man:systemd-sysv-generator(8)Process: 3847 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn network[3847]: RTNETLINK answers: File exists8月 17 11:34:36 python.cn systemd[1]: network.service: control process exited, code=exited status=18月 17 11:34:36 python.cn systemd[1]: Failed to start LSB: Bring up/down networking.8月 17 11:34:36 python.cn systemd[1]: Unit network.service entered failed state.8月 17 11:34:36 python.cn systemd[1]: network.service failed.service failed.

网上回答一大堆，终于找出了罪魁祸首：就是 ： networkmanager

关闭它即可；

systemctl stop NetworkManager

systemctl disable NetworkManager

之后重启网络即可：

systemctl start network.service