How to Migrate CentOS 7 to AlmaLinux 8

Upgrade CentOS 7 to latest version with

yum update -y

Reboot the server

reboot

Install elevate repo rpm file

yum install -y http://repo.almalinux.org/elevate/elevate-release-latest-el$(rpm --eval %rhel).noarch.rpm

Install leapp

yum install -y leapp-upgrade leapp-data-almalinux

Run pre upgrade check

leapp preupgrade

After the preupgrade script run, it will generate a log file /var/log/leapp/leapp-report.txt, you need to fix any problems reported in this file.

On CentOS 7, you need to run these 2 commands as they will cause upgrade blocking.

rmmod pata_acpi
leapp answer --section remove_pam_pkcs11_module_check.confirm=True

Run the upgrade

leapp upgrade

During the upgrade, server will reboot itself. This process can take a while to finish. Don’t interrupt the process or you will end up with non working server.

Once the upgrade process is finished, reboot the server.

reboot