CentOS下重新安装yum

1，下载最新的yum-3.2.28.tar.gz并解压

#wget http://yum.baseurl.org/download/3.2/yum-3.2.28.tar.gz
#tar xvf yum-3.2.28.tar.gz

2，进入目录，运行安装

#cd yum-3.2.28
#./yummain.py install yum
如果提示错误： CRITICAL:yum.cli:Config Error: Error accessing file for config file:///etc/

是缺少配置文件。在etc目录下面新建yum.conf文件，然后再次运行 yummain.py install yum，顺利完成安装。

3，最后更新系统

#yum check-update
#yum update
#yum clean all

所报错误

----------------------------------------------------------------------------------------------------------------------

yummain.py install yum 不能运行的原因 yummain.py not found、

[root@akinlau ~] wget http://tel.mirrors.163.com/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-8.el6.noarch.rpm

[root@akinlau ~] wget http://tel.mirrors.163.com/centos/6/os/x86_64/Packages/python-pycurl-7.19.0-8.el6.x86_64.rpm

[root@akinlau ~] wget http://tel.mirrors.163.com/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm

[root@akinlau ~] rpm -ivh python-urlgrabber-3.9.1-8.el6.noarch.rpm python-pycurl-7.19.0-8.el6.x86_64.rpm yum-metadata-parser-1.1.2-16.el6.x86_64.rpm

如果不安装python-urlgrabber，python-pycurl，yum-metadata-parser这3个包的话，在下面运行./yummain.py install yum的话会报以下错误：

报错如下

如果上述rpm连接失效，请到这里去一个一个的找：http://rpm.pbone.net/

报错1： [root@akinlau yum-3.4.3]# ./yummain.py  Traceback (most recent call last): File “./yummain.py”, line 28, in <module> from yum import Errors File “/root/nagios/yum-3.4.3/yum/__init__.py”, line 52, in <module> import config File “/root/nagios/yum-3.4.3/yum/config.py”, line 30, in <module> from parser import ConfigPreProcessor, varReplace File “/root/nagios/yum-3.4.3/yum/parser.py”, line 4, in <module> import urlgrabber ImportError: No module named urlgrabber

报错2： [root@akinlau yum-3.4.3]# ./yummain.py  Traceback (most recent call last): File “./yummain.py”, line 28, in <module> from yum import Errors File “/root/nagios/yum-3.4.3/yum/__init__.py”, line 55, in <module> import rpmsack File “/root/nagios/yum-3.4.3/yum/rpmsack.py”, line 38, in <module> import yum.depsolve File “/root/nagios/yum-3.4.3/yum/depsolve.py”, line 30, in <module> from transactioninfo import TransactionMember File “/root/nagios/yum-3.4.3/yum/transactioninfo.py”, line 32, in <module> from sqlitesack import YumAvailablePackageSqlite File “/root/nagios/yum-3.4.3/yum/sqlitesack.py”, line 26, in <module> import yumRepo File “/root/nagios/yum-3.4.3/yum/yumRepo.py”, line 33, in <module> import sqlitecachec ImportError: No module named sqlitecachec

创建yum配置文件

[root@akinlau ~] touch /etc/yum.conf

注：如果不创建yum.conf的话，下面运行./yummain.py install yum的话会报以下错误：

[root@akinlau yum-3.4.3]# ./yummain.py  CRITICAL:yum.cli:Config Error: Error accessing file for config file:///etc/yum.conf

下载yum源码包并安装

[root@akinlau ~] wget http://yum.baseurl.org/download/3.4/yum-3.4.3.tar.gz

解压源码包[root@akinlau ~] tar zxvf yum-3.4.3.tar.gz

编译安装yum[root@akinlau ~] cd yum-3.4.3

[root@akinlau yum-3.4.3] ./yummain.py install yum

base                                                         | 3.7 kB     00:00   

base/primary_db                                              | 4.5 MB     00:07   

extras                                                       | 3.5 kB     00:00   

extras/primary_db                                            |  23 kB     00:03

出现以上提示就证明yum已经安装成功了。