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How to Elevate from CentOS 7/8 to AlmaLinux

James Ensor•

CentOS is nearing End of Life. This guide will walk you through the process of migrating your CentOS system to AlmaLinux using the AlmaLinux ELevate tool. ELevate offers a smooth transition between major versions of Red Hat Enterprise Linux (RHEL) derivatives, including CentOS.

Important Note: Before proceeding, it’s crucial to back up your entire system. This ensures you can recover data in case of any unforeseen issues.

Prerequisites

  • A CentOS system (version 7 or 8) with internet access.
  • Root privileges or a user with sudo access.

Steps

Update your CentOS System:

Ensure your CentOS system is up-to-date with the latest packages. Run the following command in your terminal:

sudo yum update -y

Install the ELevate Repository:

The ELevate repository provides the necessary tools for migration. The specific steps will depend on your CentOS version:

CentOS 7:

sudo yum install -y http://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm

CentOS 8:

The ELevate repository is already available in AlmaLinux 8 sources. You can skip this step.

Install Leapp Utility:

Leapp is the core tool within ELevate that handles the migration process. Use the following command to install it:

sudo yum install -y leapp

Pre-upgrade Check (Optional but Recommended):

Before initiating the migration, it’s wise to perform a pre-upgrade check. This step identifies potential issues that might hinder a successful transition. Run the following command:

sudo leapp preupgrade

The pre-upgrade check might reveal incompatibility issues. Carefully review the generated report (/var/log/leapp/leapp-report.txt) and address any identified problems before proceeding.

Migrate to AlmaLinux:

Once you’re ready to begin the migration, execute the following command:

sudo leapp upgrade
  1. The migration process can take a significant amount of time, depending on your system configuration and internet speed. It will involve multiple reboots, so avoid interrupting the process.
  2. Post-upgrade Tasks:After a successful migration, log in to your new AlmaLinux system and verify everything functions as expected. You might need to update some configurations or packages specific to AlmaLinux.

Additional Resources:

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How to Elevate from CentOS 7/8 to AlmaLinux | 5wire Networks