CentOS7下启用网卡

[root@localhost network-scripts]# ls
ifcfg-ens99  ifdown-ippp    ifdown-sit       ifup-bnep  ifup-plip    ifup-Team          network-functions-ipv6
ifcfg-lo     ifdown-ipv6    ifdown-Team      ifup-eth   ifup-plusb   ifup-TeamPort
ifdown       ifdown-isdn    ifdown-TeamPort  ifup-ib    ifup-post    ifup-tunnel
ifdown-bnep  ifdown-post    ifdown-tunnel    ifup-ippp  ifup-ppp     ifup-wireless
ifdown-eth   ifdown-ppp     ifup             ifup-ipv6  ifup-routes  init.ipv6-global
ifdown-ib    ifdown-routes  ifup-aliases     ifup-isdn  ifup-sit     network-functions

出现的问题

[root@localhost ~]# 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 三 2017-11-01 14:55:22 CST; 11s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 5336 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 7611 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain network[7611]: RTNETLINK answers: Fil...
11月 01 14:55:22 localhost.localdomain systemd[1]: network.service: control ...
11月 01 14:55:22 localhost.localdomain systemd[1]: Failed to start LSB: Brin...
11月 01 14:55:22 localhost.localdomain systemd[1]: Unit network.service ente...
11月 01 14:55:22 localhost.localdomain systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

　　

[root@localhost ~]# systemctl stop NetworkManager
[root@localhost ~]# 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.

　　禁止网络和启用网络命令:　　

[root@localhost network-scripts]# systemctl stop NetworkManager
[root@localhost network-scripts]# systemctl start NetworkManager

[root@localhost network-scripts]# service network restart
Restarting network (via systemctl):                        [  确定  ]