虚拟机中的center os 7 动不动不能上网了！解决方法！

我的虚拟机中的center os 7 的联网情况一直都是量子状态，没有规律可循，不知道哪次关机回来就不能上网了，ifconfig看不到真正网卡的信息，启动网卡体提示： 

Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn'

查阅了网上结果，有N多中情况，这里只记录下我解决了的方法，感谢 https://blog.csdn.net/weixin_39663255/article/details/80892774

1. 停服务

systemctl stop NetworkManager

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.

2. 重启回来起服务

systemctl start network.service

[root@123 bin]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.128  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::20c:29ff:fe84:b4  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:84:00:b4  txqueuelen 1000  (Ethernet)
        RX packets 3629648  bytes 315562709 (300.9 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2974  bytes 295864 (288.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 90  bytes 6748 (6.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 90  bytes 6748 (6.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

3. 测试 ifconfig

真正的网卡信息出来了

详情转载自：https://blog.csdn.net/weixin_39663255/article/details/80892774