Yum出错Error: Cannot find a valid baseurl for repo: addons

使用yum时出现了下面的错误提示:

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386&repo=addons error was
[Errno 4] IOError:
Error: Cannot find a valid baseurl for repo: addons

然后 ping mirrorlist.centos.org 发现ping不通.怀疑是dns设置问题.

ping www.ctohome.com

也出现:

unknown host www.ctohome.com

的错误.多试一试偶尔会ping通,说明dns的确有问题.于是,我们来修改dns配置:

vi /etc/resolv.conf

汗,发现vi也不能用,思索下,其实我们只是需要修改/etc/resolv.conf文件,直接一个dns服务器即可,想到了echo命令:

echo "nameserver 8.8.8.8" >> /etc/resolv.conf

搞定,ping www.baidu.com 顺畅了,yum可以用了!第一件事情,就是去删除/etc/resolv.conf里面有问题的dns服务器.