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1.检查yum包 rpm -qa |grep yum 
2.删除自带包 
rpm -aq | grep yum | xargs rpm -e –nodeps 
3.再检查一下 
rpm -qa |grep yum 
4.下载更新包（http://mirrors.163.com/centos/6/os/x86_64/Packages/） 

5.执行安装 
rpm -ivh yum-* 
如果出现

error: Failed dependencies:
        python-urlgrabber >= 3.9.1-10 is needed by yum-3.2.29-73.el6.centos.noarch

不要慌，这个问题很恶心会导致后面安装前功尽弃，使用下面 
rpm -Uvh python-urlgrabber-3.9.1-11.el6.noarch.rpm 
更新rpm -Uvh python-urlgrabber版本，不更新肯定安装不过去 
在执行： 
rpm -ivh yum-*

warning: yum-3.2.29-73.el6.centos.noarch.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Preparing...                ########################################### [100%]
   1:yum-metadata-parser    ########################################### [ 20%]
   2:yum-plugin-fastestmirro########################################### [ 40%]
   3:yum                    ########################################### [ 60%]
   4:yum-updateonboot       ########################################### [ 80%]
   5:yum-utils              ########################################### [100%

安装成功了 
6.切换源 
cd /etc/yum.repos.d/ 
mv redhat.repo redhat.repo.bak 
mv rhel-source.repo rhel-source.repo.bak 
vi /etc/yum.repos.d/CentOS-Base.repo 
粘贴如下信息：

#CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-6 - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/7/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6.5

#released updates
[updates]
name=CentOS-6 - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6.5

#additional packages that may be useful
[extras]
name=CentOS-6 - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6.5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6.5

8.清理缓存 
yum clean all

yum makecache

9.验证

yum install telnet

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原文地址：https://www.cnblogs.com/kurds/p/9517717.html