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

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-25.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-libs-4.11.3-25.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-build-libs-4.11.3-25.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-python-4.11.3-25.el7.x86_64.rpm
rpm -Uvh *.rpm

echo '[163]' >> /etc/yum.repos.d/custom.repo
echo 'baseurl=http://mirrors.163.com/centos/7/os/x86_64/' >> /etc/yum.repos.d/custom.repo
echo 'name=163' >> /etc/yum.repos.d/custom.repo
echo 'gpgcheck=0' >> /etc/yum.repos.d/custom.repo
echo 'enabled=1' >> /etc/yum.repos.d/custom.repo

https://archive.fedoraproject.org/pub/epel/7/x86_64/

echo '[epel]' >> /etc/yum.repos.d/custom.repo
echo 'baseurl=http://mirrors.163.com/centos/7/extras/x86_64//' >> /etc/yum.repos.d/custom.repo
echo 'name=extra' >> /etc/yum.repos.d/custom.repo
echo 'gpgcheck=0' >> /etc/yum.repos.d/custom.repo
echo 'enabled=1' >> /etc/yum.repos.d/custom.repo


echo '[epel]' >> /etc/yum.repos.d/custom.repo
echo 'baseurl=https://archive.fedoraproject.org/pub/epel/7/x86_64/' >> /etc/yum.repos.d/custom.repo
echo 'name=epel' >> /etc/yum.repos.d/custom.repo
echo 'gpgcheck=0' >> /etc/yum.repos.d/custom.repo
echo 'enabled=1' >> /etc/yum.repos.d/custom.repo
yum repolist

yum install yum-utils -y
yum install centos-release-scl epel-release -y