CentOS6.5 重启网络报错：Bringing up interface eth0: Error: Connection activation failed: Device not managed by NetworkManager or unavailable

CentOS6.5 重启网络报错：

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

 解决方法：

[root@localhost network-scripts]# vi ifcfg-eth0 
[root@localhost network-scripts]# service network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Error: Connection activation failed: Device not managed by NetworkManager or unavailable
                                                           [FAILED]
[root@localhost network-scripts]# cd /
[root@localhost /]# chkconfig NetworkManager off
[root@localhost /]# chkconfig network on
[root@localhost /]# service NetworkManager stop
Stopping NetworkManager daemon:                            [  OK  ]
[root@localhost /]# service network start
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:                                [  OK  ]
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
RTNETLINK answers: File exists
[root@localhost /]# service network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Determining if ip address 192.168.20.26 is already in use for device eth0...
                                                           [  OK  ]
[root@localhost /]#