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重新加载网卡时出现的错误如下：
1 [root@vdb1 dev]# service network restart 2 Shutting down interface eth0: Device state: 3 (disconnected) 3 [ OK ] 4 Shutting down interface eth1: [ OK ] 5 Shutting down interface eth2: Device state: 3 (disconnected) 6 [ OK ] 7 Shutting down loopback interface: [ OK ] 8 Bringing up loopback interface: [ OK ] 9 Bringing up interface eth0: Active connection state: activating 10 Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/23 11 Error: Timeout 90 sec expired. 12 [FAILED] 13 Bringing up interface eth1: Active connection state: activated 14 Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/25 15 [ OK ] 16 Bringing up interface eth2: Active connection state: activated 17 Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/26 18 [ OK ]
此时，当前网卡也是可以通信的，但是通过网络管理工具修改IP之后，当前修改操作是不会生效的。那如何消除这个提示呢？
其实，问题的原因是RedHat自己开发的NetworkManager管理工具和/etc/sysconfig/network-scripts/ifcfg-ethx配置不同步造成的。如果要消除这个提示，请关闭NetworkManager服务即可：
[root@vdb1 dev]# chkconfig NetworkManager off --永久关闭服务，需要重启 [root@vdb1 dev]# service NetworkManager stop --立即关闭服务，不需要重启 Stopping NetworkManager daemon: [ OK ]
此时，再重新加载network服务即可：
1 [root@vdb1 dev]# service network restart 2 Shutting down interface eth0: [ OK ] 3 Shutting down interface eth1: [ OK ] 4 Shutting down interface eth2: [ OK ] 5 Shutting down loopback interface: [ OK ] 6 Bringing up loopback interface: [ OK ] 7 Bringing up interface eth0: 8 Determining IP information for eth0... failed. 9 [FAILED] 10 Bringing up interface eth1: Determining if ip address 192.168.179.181 is already in use for device eth0... 11 [ OK ] 12 Bringing up interface eth2: Determining if ip address 172.168.180.191 is already in use for device eth2... 13 [ OK ]