Failed to start LSB: Bring up/down networking.

由于我的虚拟机是从别的机器拷贝过来的，导入新机器后，没有问题，第二天就网络连接不上了，就出现下面的错误

[root@centos ~]# /etc/init.d/network restart
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.
                                                           [FAILED]
[root@centos ~]# systemctl status network
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue -- :: EDT; 23s ago
     Docs: man:systemd-sysv-generator()
  Process:  ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=/SUCCESS)
  Process:  ExecStart=/etc/rc.d/init.d/network start (code=exited, status=/FAILURE)

Mar  :: centos systemd[]: Starting LSB: Bring up/down networking...
Mar  :: centos network[]: Bringing up loopback interface:  [  OK  ]
Mar  :: centos network[]: Bringing up interface eth0:  Error: ...n.
Mar  :: centos network[]: [FAILED]
Mar  :: centos network[]: Bringing up interface eth1:  Connect...)
Mar  :: centos network[]: [  OK  ]
Mar  :: centos systemd[]: network.service: control process exited,...=
Mar  :: centos systemd[]: Failed to start LSB: Bring up/down netwo...g.
Mar  :: centos systemd[]: Unit network.service entered failed state.
Mar  :: centos systemd[]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

百度了一大堆，都说是拷过来的时候mac地址的问题。

下面就提供了我解决问题的方法：

#关闭系统自带的NetworkManager这个管理套件就可以解决。
[root@centos ~]# systemctl stop NetworkManager
[root@centos ~]# systemctl disable NetworkManager
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
[root@centos ~]#
#重启网络
[root@centos ~]# /etc/init.d/network restart
Restarting network (via systemctl):                        [  OK  ]