CentOS yum报错的一般解决方法

centos-yum update问题-103

在centOs上安装软件时。提示报错信息：
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 – “Couldn’t resolvehost ‘mirrorlist.centos.org'”
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=extras errorwas
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates errorwas
http://mirrors.163.com/centos/6.2/os/x86_64/repodata/repomd.xml:[Errno 14] PYCURL ERROR 6 – “Couldn’t resolve host ‘mirrors.163.com'”
Trying other mirror.
Error: Cannot retrieve repository metadata(repomd.xml) for repository: base. Please verify its path and try again
[root@hbase01-222 ~]# service iptables stop
[root@hbase01-222 ~]# nslookup mirrorlist.centos.org
;; connection timed out; no servers couldbe reached
到这里发现问题了，我的域名解析不了，yum的配置文件里指向的域名就识别不了了。重新设置下dns指向。
[root@hbase01-222 ~]# vim /etc/resolv.conf
# Generated by NetworkManager

nameserver 8.8.8.8