IT manuals: Upgrade from CentOS 7 to CentOS 8

Download and install EPEL repository:

yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

yum -y install rpmconf yum-utils

Resolving rpm packages:

rpmconf -a

result:

Keep Default.

Cleanup packages we don't need.

package-cleanup --leaves
package-cleanup --orphans

result:

Install an RPM-based software DNF package manager :

yum -y install dnf

Removing yum package manager:

dnf -y remove yum yum-metadata-parser
rm -Rf /etc/yum

Updating a system with DNF:

sudo dnf -y upgrade

Installing the new version:

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

Upgrading EPEL repository:

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

Cleaning full temporary files kept on the repository

dnf clean all

Removing kernels

rpm -e `rpm -q kernel`

Removing conflicting

rpm -e --nodeps sysvinit-tools

Now we launch the upgrade

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

Processing new configuration:

rpmconf -a

Confirm that new kernel-core is properly installed:

rpm -e kernel-core
dnf -y install kernel-core

Confirm that grub is updated and in the right place

ROOTDEV=`ls /dev/*da|head -1`;
echo "Detected root as $ROOTDEV..."
grub2-install $ROOTDEV

Install Minimal package:

dnf -y groupupdate "Core" "Minimal Install"

Check Centos version:

cat /etc/centos-release

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