Linux Centos 6.5网络启动不起来Bringing up interface eth0: Error:Connection activation failed:Device not man

1. Remove Network Manager from startup Services.
#chkconfig NetworkManager off

2. 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