修改ip后，重新加载网卡时出现的错误如下：
[root@vdb1 dev]# service network restart Shutting down interface eth0: Device state: 3 (disconnected) [ OK ] Shutting down interface eth1: [ OK ] Shutting down interface eth2: Device state: 3 (disconnected) [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: Active connection state: activating Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/23 Error: Timeout 90 sec expired. [FAILED] Bringing up interface eth1: Active connection state: activated Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/25 [ OK ] Bringing up interface eth2: Active connection state: activated Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/26 [ 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 ]
