Centos6 yum安装相关问题与处理
由于要使用yum下载文件，突然yum下载不了想要的文件，想更换yum源，结果得重新安装yum
来自本人GitHub地址
一、问题1
[root@bogon ~]# yum -vThere was a problem importing one of the Python modulesrequired to run yum. The error leading to this problem was: No module named yumPlease install a package which provides this module, orverify that the module is installed correctly.It's possible that the above module doesn't match thecurrent version of Python, which is:2.6.6 (r266:84292, Nov 22 2013, 12:16:22) [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]If you cannot solve this problem yourself, please go to the yum faq at: http://yum.baseurl.org/wiki/Faq
解决方法与步骤：
- 清除原有RHEL的YUM及相关软件包。
rpm -qa | grep yum | xargs rpm -e --nodepsrpm -qa |grep python-urlgrabber|xargs rpm -e --nodeps
- 下载centos6的相关软件包。 python-urlgrabber-3.9.1-11.el6.noarch.rpm python-iniparse-0.3.1-2.1.el6.noarch.rpm yum-3.2.29-81.el6.centos.noarch.rpm yum-metadata-parser-1.1.2-16.el6.x86_64.rpm yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
wget http://mirrors.ustc.edu.cn/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-11.el6.noarch.rpmwget http://mirrors.ustc.edu.cn/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpmwget http://mirrors.ustc.edu.cn/centos/6/os/x86_64/Packages/yum-3.2.29-81.el6.centos.noarch.rpmwget http://mirrors.ustc.edu.cn/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpmwget http://mirrors.ustc.edu.cn/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
注意： 如果文件无法下载，就可能是版本问题，重新到
- 安装下载的安装包
rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpmrpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm rpm -ivh yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm yum-3.2.29-81.el6.centos.noarch.rpm
- 检查是否安装成功
rpm -qa | grep yum rpm -qa | grep python
二、问题2 -- : [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'" 问题处理
[root@bogon yum.repos.d]# yum makecache已加载插件：fastestmirrorLoading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.combase | 3.7 kB 00:00 http://apt.sw.be/redhat/el6/en/x86_64/dag/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'"尝试其他镜像。错误：Cannot retrieve repository metadata (repomd.xml) for repository: dag. Please verify its path and try again
这个问题最后明白yum源地址不行了，得更换了；
解决方法：
-
cd /etc/yum.repos.d 进入这个目录，里面有个文件dag.repo 文件(可能名称会不一样)里面的 baseurl=
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vi 编译一下里面的地址baseurl, 把后面的地址更换 我索性网上找到了有一篇文章有很多个地址，然后就替换进去，不怕地址都用不了。
[dag]name=Dag RPM Repository for Red Hat Enterprise Linuxbaseurl=http://archive.cs.uu.nl/mirror/dag.wieers/redhat/el$releasever/en/$basearch/dag http://apt.sw.be/redhat/el$releasever/en/$basearch/dag http://dag.linux.iastate.edu/dag/redhat/el$releasever/en/$basearch/dag http://ftp.riken.jp/Linux/dag/redhat/el$releasever/en/$basearch/dag/ http://ftp2.lcpe.uni-sofia.bg/freshrpms/pub/dag/redhat/el$releasever/en/$basearch/dag http://ftp.heanet.ie/pub/freshrpms/pub/dag/redhat/el$releasever/en/$basearch/dag http://ftp-stud.fht-esslingen.de/dag/redhat/el$releasever/en/$basearch/dag http://mirror.cpsc.ucalgary.ca/mirror/dag/redhat/el$releasever/en/$basearch/dag http://mirrors.ircam.fr/pub/dag/redhat/el$releasever/en/$basearch/dag http://rh-mirror.linux.iastate.edu/pub/dag/redhat/el$releasever/en/$basearch/dag http://rpmfind.net/linux/dag/redhat/el$releasever/en/$basearch/dag http://wftp.tu-chemnitz.de/pub/linux/dag/redhat/el$releasever/en/$basearch/dag http://www.mirrorservice.org/sites/apt.sw.be/redhat/el$releasever/en/$basearch/daggpgcheck=1enabled=1gpgkey=http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
- 使用如下命令更新到最新系统
yum -y update # -y 代表自动回答yes来开始下载与安装