Linux yum失敗解決
問題：
在CentOS 5.5中需要使用yum安裝程序，出現錯誤:
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
/usr/lib/python2.4/site-packages/_sqlitecache.so: wrong ELF class: ELFCLASS32
Please install a package which provides this module, or
verify that the module is installed correctly.
解決辦法：
放狗搜，原因是python版本不兼容，辦法是卸載原來的yum重新安裝；
1. 確定當前CentOS的版本
[root@centos-74 yum.repos.d]# lsb_release -a
LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: CentOS
Description: CentOS release 5.5 (Final)
Release: 5.5
Codename: Final
可以看到當前的CentOS版本是5.5；
[root@centos-74 yum.repos.d]# uname -a
Linux centos-74 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
可以看到所安裝的是X86_64的系統；
2. 安裝yum程序
2.1 從網易的mirrors下載所需要的rpm包；
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm
該文件從網易的站點已經下載不到了，只有python-iniparse-0.2.3-6.el5.noarch.rpm，但是python-iniparse-0.2.3-6.el5.noarch.rpm會與其他三個文件存在兼容性問題，所以，放狗搜一下，從其他地方下載python-iniparse-0.2.3-4.el5.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-40.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-4.el5.centos.x86_64.rpm
2.2 安裝已經下載的軟件包
rpm -ivh --nodeps python-iniparse-0.2.3-4.el5.noarch.rpm yum-3.2.22-40.el5.centos.noarch.rpm yum-metadata-parser-1.1.2-4.el5.centos.x86_64.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
不知為什么，上述命令執行完畢后只提示安裝了第一個軟件包python-iniparse-0.2.3-4.el5.noarch.rpm
Preparing... ########################################### [100%]
package python-iniparse-0.2.3-4.el5.noarch is already installed
再次安裝剩余的軟件包，
rpm -ivh --nodeps yum-3.2.22-40.el5.centos.noarch.rpm yum-metadata-parser-1.1.2-4.el5.centos.x86_64.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
Preparing... ########################################### [100%]
1:yum-metadata-parser ########################################### [ 33%]
2:yum-fastestmirror ########################################### [ 67%]
3:yum ########################################### [100%]
通過命令rpm -qa | grep yum查看安裝結果
[root@centos-74 zhao]# rpm -qa|grep yum
yum-3.2.22-40.el5.centos
yum-fastestmirror-1.1.16-21.el5.centos
yum-metadata-parser-1.1.2-4.el5
[root@centos-74 zhao]#
導入證書
rpm -import http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5
讓yum使用網易的源：
#wget http://mirrors.163.com/.help/CentOS-Base-163.repo
編輯CentOS-Base-163.repo，在所有mirrorlist前面加上#，把所有$releasever替換成5，然后保存。
#yum clean metadata
完成后yum可以正常工作，更新yum
#yum -y upgrade
- 本文來自：Linux學習網