There are multiple ways to upgrade a PostgreSQL database from the old version 14 to the newer version 15, and the easiest one is by using pg_upgrade. This tool performs a rapid upgrade to a later PostgreSQL major version by reusing the old user data files.
In this step-by-step tutorial for Ubuntu (or Debian) systems, we will:
- Install the new PostgreSQL version alongside the old one
- Check and migrate any differences in config files
- Migrate the actual PostgreSQL data (users, tables, etc.)
- Switch to the newly installed version
- Do some post-installation maintenance
- Remove the old PostgreSQL version and data
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What people say
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