CentOS之——Bringing up interface eth0: Error: Connection activation failed:

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重启网络连接时，报以下错误：

Bringing up interface eth0: Error:Connection activation failed:Device not managed by NetworkManager

解决方法：

1、Remove Network Manager from startup Services.
[root@localhost ~]# chkconfig NetworkManager off

2、Add Default Net Manager
[root@localhost ~]# chkconfig network on

3、Stop NetworkManager first
[root@localhost ~]# service NetworkManager stop

4、and then start Default Manager
[root@localhost ~]# service network start
 
5、然后重新启动网络，可能还会出现以下信息，可以不用管，也可以重启一下电脑主机
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists