yum update

 

yum install epel-release -y

 

yum install rpmconf yum-utils

 

rpmconf -a

 

package-cleanup --leaves

 

package-cleanup --orphans

 

yum install dnf

 

dnf -y remove yum yum-metadata-parser

dnf remove yum yum-metadata-parser

 

rm -Rf /etc/yum

 

dnf -y upgrade

 

dnf -y upgrade http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm

 

dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

 

dnf clean all

 

rpm -e `rpm -q kernel`

 

rpm -e --nodeps sysvinit-tools

 

dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync

 

rpmconf -a

 

rpm -e kernel-core

 

dnf -y install kernel-core

 

dnf -y groupupdate "Core" "Minimal Install" --allowerasing

 

cat /etc/centos-release