centOS 7网络突然出现问题

centOS 7一个解决“network.service: control process exited, code=exited status=1”方法

今天早上2017-08-04，我打开虚拟机，使用远程工具xshell对虚拟机进行连接，我发现连接不上去，然后我ifconfig，发现找不到ens33了，就剩一个本地回环，看来是我的网络出现了问题。

然后我查看我的网络状态，发现了如下情况：

[root@CT71 ~]# systemctl status network.service 
● 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 Fri 2017-08-04 08:20:31 CST; 1min 44s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 62726 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 63183 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 network[63183]: RTNETLINK answers: File exists
Aug 04 08:20:31 CT71 systemd[1]: network.service: control process exited, code=exited status=1
Aug 04 08:20:31 CT71 systemd[1]: Failed to start LSB: Bring up/down networking.
Aug 04 08:20:31 CT71 systemd[1]: Unit network.service entered failed state.
Aug 04 08:20:31 CT71 systemd[1]: network.service failed.

 

我在某度上找了好几个答案，都没有找到我能解决问题的答案，然后我进行Google，在一个博客上找到了我需要的答案，不知道是不是会针对于大家都可以，方法是关闭网络管理，如下：

systemctl stop NetworkManager

systemctl start network.service

我在执行上面一步后就已经解决了问题。

其他解决方案：

1. 通过命令查看主机的Mac地址：

[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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 UP qlen 1000
    link/ether 52:54:00:a7:a3:07 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.238/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 2408:8207:6c81:b160:5054:ff:fea7:a307/64 scope global mngtmpaddr dynamic 
       valid_lft 259191sec preferred_lft 172791sec
    inet6 fe80::5054:ff:fea7:a307/64 scope link 
       valid_lft forever preferred_lft forever
[root@localhost ~]# 

 

2. 查看网卡配置中HWADDR地址是否有网卡地址一致。如果不一致，按照Mac地址修改网卡配置文件中内容。然后重启网卡

cat /etc/sysconfig/network-scripts/ifcfg-eth0