centos中yum无法使用问题

今天碰到一台服务器无法使用yum install命令，是centos 5.5的系统，自己瞎折腾了一下，居然被我解决了，神奇啊，解决方法贴一下。
显示错误如下：

引用

Loaded plugins: fastestmirror
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
/Eg.
removing mirrorlist with no valid mirrors: /var/cache/yum/addons/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: addons

不知道什么时候把mirrors.txt文件给去掉了。
后来查了一下有这么一串。

引用

1./var/cache/yum/base/mirrorlist.txt
url:

http://mirrors.163.com/centos/6.2/os/x86_64/

http://centos.ustc.edu.cn/centos/6.2/os/x86_64/

http://mirror.neu.edu.cn/centos/6.2/os/x86_64/

http://mirrors.ta139.com/centos/6.2/os/x86_64/

http://ftp.nsysu.edu.tw/CentOS/6.2/os/x86_64/

http://ftp.tc.edu.tw/Linux/CentOS/6.2/os/x86_64/

http://ftp.isu.edu.tw/pub/Linux/CentOS/6.2/os/x86_64/

http://ftp.stu.edu.tw/Linux/CentOS/6.2/os/x86_64/

http://ftp.twaren.net/Linux/CentOS/6.2/os/x86_64/

http://ftp.cs.pu.edu.tw/Linux/CentOS/6.2/os/x86_64/

http://mirror01.idc.hinet.net/CentOS/6.2/os/x86_64/

http://centos.mirror.cdnetworks.com/6.2/os/x86_64/

http://centos.tt.co.kr/6.2/os/x86_64/

http://data.nicehosting.co.kr/os/CentOS/6.2/os/x86_64/

http://mirror.khlug.org/centos/6.2/os/x86_64/

http://mirror.yongbok.net/centos/6.2/os/x86_64/

http://ftp.daum.net/centos/6.2/os/x86_64/

http://mirror.nus.edu.sg/centos/6.2/os/x86_64/

http://mirror.averse.net/centos/6.2/os/x86_64/

http://mirrors.sin1.sg.voxel.net/centos/6.2/os/x86_64/

2./var/cache/yum/updates/mirrorlist.txt
url:

http://mirror.neu.edu.cn/centos/6.2/updates/x86_64/

http://mirrors.ta139.com/centos/6.2/updates/x86_64/

http://mirrors.stuhome.net/centos/6.2/updates/x86_64/

http://centos.ustc.edu.cn/centos/6.2/updates/x86_64/

http://ftp.stu.edu.tw/Linux/CentOS/6.2/updates/x86_64/

http://mirror01.idc.hinet.net/CentOS/6.2/updates/x86_64/

http://ftp.tc.edu.tw/Linux/CentOS/6.2/updates/x86_64/

http://ftp.isu.edu.tw/pub/Linux/CentOS/6.2/updates/x86_64/

http://ftp.cs.pu.edu.tw/Linux/CentOS/6.2/updates/x86_64/

http://ftp.daum.net/centos/6.2/updates/x86_64/

http://mirror.khlug.org/centos/6.2/updates/x86_64/

http://data.nicehosting.co.kr/os/CentOS/6.2/updates/x86_64/

http://centos.tt.co.kr/6.2/updates/x86_64/

http://mirror.averse.net/centos/6.2/updates/x86_64/

ftp://ftp.oss.eznetsols.org/linux/centos/6.2/updates/x86_64/

http://mirror.nus.edu.sg/centos/6.2/updates/x86_64/

http://mirrors.sin1.sg.voxel.net/centos/6.2/updates/x86_64/

http://centos.vr-zone.com/6.2/updates/x86_64/

http://rsync.atworks.co.jp/centos/6.2/updates/x86_64/

http://ftp.nara.wide.ad.jp/pub/Linux/centos/6.2/updates/x86_64/

3./var/cache/yum/addons/mirrorlist.txt
url:

http://mirror.centos.org/centos/5/addons/x86_64/

4./var/cache/yum/extras/mirrorlist.txt
url:

http://centos.ustc.edu.cn/centos/6.2/extras/x86_64/

http://mirrors.stuhome.net/centos/6.2/extras/x86_64/

http://mirror.neu.edu.cn/centos/6.2/extras/x86_64/

http://mirrors.ta139.com/centos/6.2/extras/x86_64/

http://ftp.cs.pu.edu.tw/Linux/CentOS/6.2/extras/x86_64/

http://ftp.stu.edu.tw/Linux/CentOS/6.2/extras/x86_64/

http://ftp.tc.edu.tw/Linux/CentOS/6.2/extras/x86_64/

http://ftp.isu.edu.tw/pub/Linux/CentOS/6.2/extras/x86_64/

http://mirror01.idc.hinet.net/CentOS/6.2/extras/x86_64/

http://data.nicehosting.co.kr/os/CentOS/6.2/extras/x86_64/

http://mirror.khlug.org/centos/6.2/extras/x86_64/

http://ftp.daum.net/centos/6.2/extras/x86_64/

http://centos.tt.co.kr/6.2/extras/x86_64/

http://centos.vr-zone.com/6.2/extras/x86_64/

http://mirror.averse.net/centos/6.2/extras/x86_64/

http://mirrors.sin1.sg.voxel.net/centos/6.2/extras/x86_64/

ftp://ftp.oss.eznetsols.org/linux/centos/6.2/extras/x86_64/

http://mirror.nus.edu.sg/centos/6.2/extras/x86_64/

http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/6.2/extras/x86_64/

http://ftp.jaist.ac.jp/pub/Linux/CentOS/6.2/extras/x86_64/

对应的把这些url拷贝到mirrorlist.txt文件中去就ok啦。