故障描述
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
[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.（来自网络）
关掉方法:
systemctl stop NetworkManager
systemctl disable NetworkManager
重新启动网络：
systemctl start network.service
其它信息：网卡配置ifcfg-ens33
TYPE="Ethernet"
BOOTPROTO="dhcp"
DEFROUTE="yes"
PEERDNS="yes"
PEERROUTES="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="b30ae93f-cd63-4c7b-b22b-28d1799d1b10"
DEVICE="ens33"
ONBOOT="yes"