CentOS 7 Upgrade to AlmaLinux 9

Unitrends version 10.9.4 supports in-place migration from CentOS 7 to AlmaLinux 9 for all virtual appliances and Gen 9 physical appliance model 9002 and all S models starting with 9016S.

CentOS 7 to AlmaLinux 9 Upgrade Process

Before you begin the upgrade, make sure that:

  • The machine has an up-to-date support contract.
  • No backups or restores are running.

Take the following steps to upgrade your appliance:

  1. From the Global Menu, click Settings> Check for Updates > Critical OS Upgrade Available.
  1. After clicking the Critical OS Upgrade Available button, your appliance is checked to determine if it is eligible for in-place upgrade.
  2. If there are errors, the OS upgrade cannot be done. You will need to correct the errors to proceed with the upgrade.
  3. If there are warnings, you have the option to go back and resolve them, then try the upgrade again, or proceed with the warnings.
    To proceed, click Continue.
  1. Once you proceed, you will see the details of the upgrade.
    Click Next.
  1. Acknowledge that you agree to the upgrade.
    Click Start Upgrade.

NOTE  Once acknowledged, the upgrade will block all actions until the upgrade is complete.

NOTE  The upgrade can take more than 1 hour to complete.

Once the upgrade has started, you can follow progress through the upgrade tracker which has 5 steps.
The upgrade tracker will be updated automatically as the upgrade proceeds.

IMPORTANT  Do not refresh your screen during this stage of the upgrade. You may lose access to the upgrade tracker if your screen is refreshed.

Once the upgrade completes, the appliance is ready to use.