RHEL7安装yum源

rpm -qa | grep yum
rpm -qa | grep yum | xargs rpm -e --nodeps

rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-168.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm --nodeps

yum remove subscription-manager

wget http://mirrors.aliyun.com/repo/Centos-7.repo
sed -i 's#$releasever#7#g' /etc/yum.repos.d/Centos-7.repo

yum clean all
yum makecache