CentOS DNS problem: Ping only IP domain name

Scenario: The day before the virtual machine in the configuration of the centos6.3, you can normally surf the internet, and the FTP server to build up, today a boot this goods unexpectedly can not surf the internet, depressed ....

Problem:

The following figure:

Can ping the IP address, but the domain name Ping pass ...

Resolution process: STEP1) A preliminary assessment of DNS problems

Step2) Googling ...

STEP3) Modify the configuration file/etc/resolv.conf and save, as shown below:

STEP4) Restart the service to load the configuration file

More Wonderful content: http://www.bianceng.cnhttp://www.bianceng.cn/Servers/DNS/

STEP5) continue to test ping www.baidu.com results are as follows:

There are still errors ... Tangled....

STEP6) Check file/etc/resolv.conf, this thing turned into this.

STEP7) Rookie one, hundred think can't understand, Googling ... New discovery: If NIC configuration file (/etc/sysconfig/network-scripts/ifcfg-eth0)

No information about DNS is set, and the file is refreshed to its original state each time the network service is restarted. Immediately configured, the NIC configuration is complete as follows:

After saving, restart service, success ...

Summary: When configuring DNS information, it is not valid to configure it in/etc/resolv.conf only if it is not configured in the NIC profile (/etc/sysconfig/network-scripts/ifcfg-eth0).