《—》
1、执行 service network restart 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.
2、根据上面的提示，执行“systemctl status network.service”输出以下的类似信息：
[root@WinJay]# 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 Tue 2017-04-25 10:39:45 CST; 7min ago
Process: 1140 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
Apr 25 10:39:44 Nerc.Crtvu network[1140]: Bringing up loopback interface: Could not load file ‘/etc/sysconfig/networ…fg-lo’
Apr 25 10:39:44 Nerc.Crtvu network[1140]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 10:39:45 Nerc.Crtvu network[1140]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 10:39:45 Nerc.Crtvu network[1140]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 10:39:45 Nerc.Crtvu network[1140]: [ OK ]
Apr 25 10:39:45 Nerc.Crtvu network[1140]: Bringing up interface eth0: Error: no device found for connection ‘eth0’.
Apr 25 10:39:45 Nerc.Crtvu network[1140]: [FAILED]
Apr 25 10:39:45 Nerc.Crtvu systemd[1]: **network.service: control process exited, code=exited status=1**
Apr 25 10:39:45 Nerc.Crtvu systemd[1]: Failed to start LSB: Bring up/down networking.
Apr 25 10:39:45 Nerc.Crtvu systemd[1]: **Unit network.service entered failed state.**
Hint: Some lines were ellipsized, use -l to show in full.3、解决的办法(由于rhel7/centos7中没有70-persistent-net.rules这个文件，复制出来的虚拟机(vmware/Hyper-v)需要修改mac地址)，就是修改mac地址。
4、如何查看centos7复制出来的虚拟机的mac地址，需要执行 “ip addr”，输出如下的类似信息：
[root@WinJay]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:15:5d:a1:6d:01 brd ff:ff:ff:ff:ff:ff
注意上面加粗加红的字，这就是新的mac地址。
接下来就剩下修改ifcfg-eth0文件了，只修改HWADDR就可以了。接下来执行service network restart 就正常了。
《二》
如果还是启动失败 查看是否有如下错误信息
Apr 25 11:09:07 hdcoe02 network[597]: Bringing up loopback interface: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 11:09:07 hdcoe02 network[597]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 11:09:08 hdcoe02 network[597]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Apr 25 11:09:08 hdcoe02 network[597]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’ Apr 25 22:09:08 hdcoe02 network[597]: [ OK ]
Apr25 11:09:08 hdcoe02 network[597]: Bringing up interface enp0s25: Error: Connection activation failed: Connection ‘enp0s25’ is not available on the device enp0s25 at this time.
设定开机启动一个名为NetworkManager-wait-online服务，命令为：
systemctl enable NetworkManager-wait-online.service
《三》
如果上面方法都测试完了 还是不成功，查看一下在VMware /Hyper-v虚拟机里面的系统右上角显示的连接有没有连接上，虽然报错都一样，可在虚拟机设置里面将原来的网络适配器删掉，重新建了一个新的网络适配器，再次进入系统，会显示连接成功，再用上面的方法，问题解决。
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