Supported in-place upgrade paths for Red Hat Enterprise Linux
Updated -
An in-place upgrade provides a way of upgrading a system to a new major release of Red Hat Enterprise Linux (RHEL) by replacing the existing operating system.
In-place upgrade from RHEL 7 to RHEL 8
IMPORTANT:
A path for an automated in-place upgrade is going to be provided only for the latest even number RHEL 8 minor version, for example RHEL 8.4.
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