Supported in-place upgrade paths for Red Hat Enterprise Linux
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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.
RHEL in-place upgrade with Leapp
Starting from RHEL 7, the in-place upgrade to the next major version release of RHEL is performed by using the Leapp utility.
In-place upgrade paths strategy
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