Web Reference: Feb 26, 2026 · Always run the pg_upgrade binary of the new server, not the old one. pg_upgrade requires the specification of the old and new cluster's data and executable (bin) directories. Why this talk? Upgrading your PostgreSQL is not a rocket science! ...but there are lots of small details An unsuccessful upgrade can ruin your data Or at least cause an unacceptable downtime Upgrade requires good knowledge of your system and substantial preparation time This document provides a step-by-step guide to safely upgrade a PostgreSQL cluster from version 14 to version 17 using the pg_upgrade tool. It follows best practices and includes dry-run validation before performing the actual upgrade.
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