问题描述：
虚拟机中的eth33网卡没有启动，执行systemctl status network.service启动报错。
报错信息如下：
[root@zeppelin network-scripts]# 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 2019-06-21 03:22:10 PDT; 27s ago Docs: man:systemd-sysv-generator(8) Process: 5948 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS) Process: 6074 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE) Jun 21 03:22:09 zeppelin.zetyun.com systemd[1]: Starting LSB: Bring up/down networking... Jun 21 03:22:10 zeppelin.zetyun.com network[6074]: Bringing up loopback interface: [ OK ] Jun 21 03:22:10 zeppelin.zetyun.com network[6074]: Bringing up interface ens33: Error: Connection activation failed: No suitable device found for this connection. Jun 21 03:22:10 zeppelin.zetyun.com network[6074]: [FAILED] Jun 21 03:22:10 zeppelin.zetyun.com systemd[1]: network.service: control process exited, code=exited status=1 Jun 21 03:22:10 zeppelin.zetyun.com systemd[1]: Failed to start LSB: Bring up/down networking. Jun 21 03:22:10 zeppelin.zetyun.com systemd[1]: Unit network.service entered failed state. Jun 21 03:22:10 zeppelin.zetyun.com systemd[1]: network.service failed.
解决办法：
与系统自带的NetworkManager这个管理套件有关系，关闭并重启网络服务即可。
关闭：
systemctl stop NetworkManager systemctl disable NetworkManager
重新启动网络：
systemctl start network.service
