本来是都配置好了的，突然有一天不好用了，ping不通，而且ResourceManager和NameNode启动不了怎么解决呢？
[root@master ~]# service network restart
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface Auto_eth3: Error: Connection activation failed: Device not managed by NetworkManager or unavailable
[FAILED]
Bringing up interface eth1: Error: No suitable device found: no device found for connection 'System eth1'.
[FAILED]
[root@master ~]#
