Linux Centos 6.5网络启动不起来Bringing up interface eth0: Error

出现错误：
Bringing up interface eth0: Error :Connection activation failed: Device not managed by NetworkManaged or unavailable [FAILED]

解决办法：
Just follow the below steps and everything will be ok…

1. Remove Network Manager from startup Services.

#chkconfig NetworkManager off

1. Add Default Net Manager

#chkconfig network on

3.Stop NetworkManager first

#service NetworkManager stop

4.and then start Default Manager

#service network start

5.#/etc/init.d/network restart