These days? I install a CentOs? but I can't input in Chinese .This make me upset.Then I know it's the problem of yum.Then I changed the yum source.
第1步
wget http://
mirrors
.
ustc.edu.cn/centos/CentOS-Base.
5
.
mirrors
.repo
-O /etc/yum.repos.d/CentOS-Base.repo
備份yum配置文件，修改yum配置文件。
cp /etc/yum.repos.d/CentOS-Base.repo CentOS-Base.repo_bak
vi /etc/yum.repo.d/CentOS-Base.repo
可以用中科大(ustc)yum源，也可以用上海交大(sjtu)yum源，兩者只能選一個。
用下面的內容覆蓋CentOS-Base.repo就行了。
#中科大(ustc)yum源，http://centos.ustc.edu.cn/centos/5/就是最新的，
#也可以設置成http://centos.ustc.edu.cn/centos/5.5/
[base]
name=CentOS-5 - Base
baseurl=http://centos.ustc.edu.cn/centos/5/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#released updates
[update]
name=CentOS-5 - Updates
baseurl=http://centos.ustc.edu.cn/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
baseurl=http://centos.ustc.edu.cn/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
baseurl=http://centos.ustc.edu.cn/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
baseurl=http://centos.ustc.edu.cn/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
baseurl=http://centos.ustc.edu.cn/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#第一部分結束
#============分割線============ 注意，上下兩部分只選一個
#
sjtu
yum源，http://ftp.sjtu.edu.cn/centos/5/就是最新的，
#也可以設置成http://ftp.sjtu.edu.cn/centos/5.5/
[base]
name=CentOS-5 - Base
baseurl=http://ftp.sjtu.edu.cn/centos/5/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#released updates
[update]
name=CentOS-5 - Updates
baseurl=http://ftp.sjtu.edu.cn/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
baseurl=http://ftp.sjtu.edu.cn/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
baseurl=http://ftp.sjtu.edu.cn/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
baseurl=http://ftp.sjtu.edu.cn/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
baseurl=http://ftp.sjtu.edu.cn/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#第二部分結束
第2步
中科大(ustc)yum源
32位: rpm --import http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
64位: rpm --import http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5
上海交大(sjtu)yum源
32位: rpm --import http://ftp.sjtu.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
64位: rpm --import http://ftp.sjtu.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5
第3步
yum update
After that if you have a proble like that.Do like this:
每次yum install 時總是出現如下錯誤
http://mirrors.ustc.edu.cn/centos/6.0/extras/x86_64/repodata/repomd.xml:
[Errno 14] PYCURL ERROR 6 -
""
|
Trying other mirror.
|
Error: Cannot retrieve repository metadata (repomd.xml)
for
repository: extras. Please verify its path and try again
|
此時聰明的我馬上想到了是不是服務器解析不了域名了，導致repomd.xml下載不下來呢？
然后我就ping了一下mirrors.ustc.edu.cn ， 果然出現錯誤：ping: unknown host?mirrors.ustc.edu.cn。顯然是DNS配置問題了，DNS域名服務器IP地址配的不對。
把/etc/hosts里面 加了一行
mirrors.ustc.edu.cn? 202.38.95.110
|
這樣就可以解析mirrors.ustc.edu.cn了。yum成功！
小記：但是這不是解決這種問題最終辦法。需要配置正確的DNS。方法是：打開/etc/resolv.conf 文件，加入一行 nameserver?ip。此處把ip換成IDC運營商給的DNS的地址就可以了。
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