How to upgrade from Almalinux 8 to Almalinux 9

    AlmaLinux is developed by the AlmaLinux OS Foundation established as a non-profit to steward ownership. The void created by the end of the CentOS Linux stable release is filled by AlmaLinux OS, an open-source, community-driven Linux operating system. AlmaLinux OS is a community-driven 1:1 binary compatible clone of RHEL®.

    1. Update the server and make sure all software installed is up to date, running the latest release of AlmaLinux 8.


      Type in the following command in the console to update.

      # yum update -y

    2. After the update is completed, reboot the server.

      # reboot

    3. Once the server has been restarted, verify that it is running the latest AlmaLinux release.

      # cat /etc/os-release

    4. Downloading the elevate testing repository is the next step. Elevate aids in distributions based on the RHEL version migration. Run the next command to down the repository.

      # curl https://repo.almalinux.org/elevate/testing/elevate-testing.repo -o /etc/yum.repos.d/elevate-testing.repo

    5. Confirm that the repository is added by running the following command.

      # ls /etc/yum.repos.d/ | grep elevate

    6. Import the Elevate GPG key.

      # rpm --import https://repo.almalinux.org/elevate/RPM-GPG-KEY-ELevate

    7. Disable SELinux.

      # vim /etc/sysconfig/selinux

    8. Change SELinux mode to Disabled.

      SELINUX=disabled

      NOTE: Once the upgradation process is completed, change the SELinux option to enforcing.

    9. Reboot after disabling SELinux.

      # reboot

      NOTE: If the SELinux is already disabled on the server, skip step 4.

    10. Disable the firewalld ZoneDrifting feature.

      # vim /etc/firewalld/firewalld.conf

    11. Disable Zonedrifting by changing yes to no.

      AllowZoneDrifting=no

    12. Install leapp packages.

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

    13. Run a pre-upgrade check.

      # leapp preupgrade

    14. Upgrade AlmaLinux 8 to AlmaLinux 9 now.

      # leapp upgrade

    15. Reboot after the upgrade.

      # reboot

    16. Once rebooted, check the OS version.

      # cat /etc/os-release


    The server has successfully upgraded from Almalinux 8 to Almalinux 9.

    Published