This detailed guide describes Leapp, Red Hat’s supported in-place upgrade tool for moving between major RHEL versions. It walks through pre-upgrade assessments, inhibitor handling, configuration checks, and remediation steps. Leapp preserves system configurations, subscriptions, and applications, minimizing downtime compared to reinstallation. The process includes automated reporting, risk categorization, and answer file management for resolving upgrade blockers. By standardizing major version transitions, Leapp reduces operational risk, improves lifecycle planning, and helps organizations stay supported and secure without disrupting production environments.

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