Centos系统还原官方yum源

Centos6:

cd /etc/yum.repos.d/
rm -rf CentOS-*
rpm -Uvh --force https://vault.centos.org/6.10/os/x86_64/Packages/centos-release-6-10.el6.centos.12.3.x86_64.rpm
yum clean all
yum makecache
yum update -y

Centos7:

cd /etc/yum.repos.d/
rm -rf CentOS-*
rpm -Uvh --force http://mirror.centos.org/centos-7/7.9.2009/os/x86_64/Packages/centos-release-7-9.2009.0.el7.centos.x86_64.rpm
yum clean all
yum makecache
yum update -y

Centos8:

cd /etc/yum.repos.d/
rm -rf CentOS-*
rpm -Uvh --force http://mirror.centos.org/centos-8/8/BaseOS/x86_64/os/Packages/centos-linux-release-8.3-1.2011.el8.noarch.rpm
yum clean all
yum makecache
yum update -y