centOS7重启网卡失败

自己手动配置了ifcfg-enoxxxxx文件后，用命令systemctl restart network重启网络后出现以下错误

Restarting network (via systemctl): Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.

根据上面的提示，执行“systemctl status network.service”输出以下的类似信息：

[root@localhost ~]# systemctl status network.service
network.service - LSB: Bring up/down networking
Loaded: loaded (/etc/rc.d/init.d/network)
Active: failed (Result: exit-code) since三 2014-11-05 15:30:10 CST; 1min 5s ago
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists
11月 05 15:30:10 localhost.localdomain systemd[1]: network.service: control process exited, code=exited
status=1
11月 05 15:30:10 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking.
11月 05 15:30:10 localhost.localdomain systemd[1]: Unit network.service entered failed state.

主要的原因是mac地址映射错误，需要显式的在配置文件中写进去，具体操作如下：

1）用ifconfig或ip addr查看mac地址；

2）将得到的mac地址写入到配置文件中去，即在ifcfg-enoxxxxx文件中修改HWADDR="XX:XX:XX:XX:XX"

XX:XX:XX:XX:XX为mac地址。如果配置文件中没有这一项就手动增加；

3）保存退出配置文件，重启网络。

参考：https://blog.csdn.net/weiyongle1996/article/details/75128239

https://blog.csdn.net/kyo19999/article/details/49097317

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