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CentOS Upgrade from 7 to 8.md

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HowTo

CentOS Upgrade from 7 to 8

#FIXME

Check

  • Create a snapshot of the machine.

  • Check os and distro of host

Prepare

  • Install the EPEL repository

yum install epel-release -y

  • Install yum utils

yum install yum-utils

  • Install rpm resolver

yum install rpmconf

  • Cleanup packages
package-cleanup --leaves
package-cleanup --orphans

Package manager

  • Install dnf package manager

yum install dnf

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

Upgrade

  • Upgrade system with dnf

dnf upgrade

  • Install CentOS release package
dnf install http://vault.centos.org/8.5.2111/BaseOS/x86_64/os/Packages/{centos-linux-repos-8-3.el8.noarch.rpm,centos-linux-release-8.5-1.2111.el8.noarch.rpm,centos-gpg-keys-8-3.el8.noarch.rpm}
  • Upgrade EPEL repository

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

Cleanup

  • Remove unncessary files

dnf clean all

  • Remove old kernel and conflicting packages
rpm -e `rpm -q kernel`
rpm -e --nodeps sysvinit-tools