RHEL7虚拟机添加新网卡后，网卡无法启动

1.在开启网络时，有错误提示：

# systemctl restart network.service  Job for network.service failed. See ‘systemctl status network.service‘ and ‘journalctl -xn‘ for details.

2.根据提示执行：提示错误日志如下

# 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 Sat 2015-07-04 13:41:38 CST; 13s ago
  Process: 3453 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 4692 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com network[4692]: RTNETLINK answers: File exists
Jul 04 13:41:38 rhce7.example.com systemd[1]: network.service: control process exited, code=exited status=1
Jul 04 13:41:38 rhce7.example.com systemd[1]: Failed to start LSB: Bring up/down networking.
Jul 04 13:41:38 rhce7.example.com systemd[1]: Unit network.service entered failed state.
# 

3.用 ip addr 命令查看MAC地址与文件/etc/sysconfig/network-scripts/ifcfg-enp0s8中显示的不一致。

4.修改/etc/sysconfig/netwrok-scripts/ifcfg-enp0s8 中HWADDR= * :*:*:*:*:* (也就是用IP ADDR 命令所查到的MAC）

5.重启系统