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Chapter 3. Plan a RHEL conversion
You can perform the automated conversion process on a running system. The Convert2RHEL utility replaces all RPM packages from the original Linux distribution by their RHEL version. At the end of the process, you must restart the system to boot the RHEL kernel.
The conversion does not affect packages that are exclusive to the original distribution and do not have corresponding counterparts in RHEL repositories. It also does not affect the third-party packages, which originate neither from the original Linux distribution nor from RHEL. Red Hat does not provide support for third-party packages that are left unchanged during the conversion process. See the Red Hat policy on supporting third-party software.
The Convert2RHEL utility does not directly affect local users and their data in the /home and /srv directories. However, Convert2RHEL cannot control actions that RPM package scriptlets perform during the conversion process.
Consider the following before converting your system to RHEL:
- Architecture
- The source operating system must be installed on a system with 64-bit Intel architecture. It is not possible to convert with other system architectures.
- Security
- Systems in FIPS mode are not supported for conversion.
- Kernel
Systems that are using kernel modules that do not exist in RHEL kernel modules are not currently supported for conversion. Red Hat recommends disabling or uninstalling foreign kernel modules before the conversion and then enabling or reinstalling those kernel modules afterward. Unsupported kernel modules include:
- Kernel modules for specialized applications, GPUs, network drivers, or storage drivers
- Custom compiled kernel modules built by DKMS
- Public clouds
Conversions on public clouds are supported in the following situations:
Alma Linux, CentOS Linux, and Rocky Linux - Use Red Hat Subscription Manager (RHSM) for the following:
- Images on Amazon Web Services (AWS), Microsoft Azure, and Google Cloud with no associated software cost.
- User-provided custom images on all public clouds
- Oracle Linux - Uses RHSM for user-provided custom images on all public clouds.
Convert2RHELis unable to access RHEL packages through Red Hat Update Infrastructure (RHUI) during the conversion.- High Availability
- Systems that are using high availability cluster software by Red Hat or third parties are not currently tested or supported for conversion to RHEL. Red Hat recommends migrating to newly installed RHEL systems to ensure the integrity of these environments.
- Identity Management
- Performing an in-place conversion of a FreeIPA server is not supported. For more information about how to migrate a FreeIPA deployment to IdM, see Migrating to IdM on RHEL 7 from FreeIPA on non-RHEL Linux distributions, Migrating to IdM on RHEL 8 from FreeIPA on non-RHEL Linux distributions*, and Migrating to IdM on RHEL 9 from FreeIPA on non-RHEL Linux distributions.
- Foreman
- Conversions of systems that use Foreman with the Katello plugin are not supported. To perform a supported conversion, migrate to Red Hat Satellite first and then proceed with the conversion.
- RAID
-
It is not possible to convert UEFI-based systems with
mdadm-managed RAID devices.
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