Kafka：ZK+Kafka+Spark Streaming集群环境搭建（十二）VMW安装四台CentOS，并实现本机与它们能交互，虚拟机内部实现可以上网。

Centos7出现异常：Failed to start LSB: Bring up/down networking.

按照《Kafka：ZK+Kafka+Spark Streaming集群环境搭建（一）VMW安装四台CentOS，并实现本机与它们能交互，虚拟机内部实现可以上网。》配置好虚拟机，正在使用中，让它强制断电后，启动起来发现ip无法访问，而且重启网络失败：

执行：systemctl restart network.service
出现异常：Failed to start LSB: Bring up/down networking.

执行ifconfig，发现配置好的ens33也不见了：

[spark@master ~]$ ifconfig
lo: flags=<UP,LOOPBACK,RUNNING>  mtu
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::  prefixlen   scopeid 0x10<host>
        loop  txqueuelen   (Local Loopback)
        RX packets   bytes  (336.0 B)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (336.0 B)
        TX errors   dropped  overruns   carrier   collisions 

解决方案：

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.

重新启动网络：

systemctl start network.service

重新ifconfig查看是否ens33启用

[root@master spark]# ifconfig
ens33: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 192.168.0.120  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::20c:29ff:fe71:ac74  prefixlen   scopeid 0x20<link>
        ether :0c:::ac:  txqueuelen   (Ethernet)
        RX packets   bytes  (27.6 KiB)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (21.5 KiB)
        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::  prefixlen   scopeid 0x10<host>
        loop  txqueuelen   (Local Loopback)
        RX packets   bytes  (336.0 B)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (336.0 B)
        TX errors   dropped  overruns   carrier   collisions 

[root@master spark]# 

到此ens33起作用了，此时测试网络也可以通了。