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 /]#