Postgres 18 Changelog #56
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This is to resolve errors like the following, now that postgres:latest resolves to the v18 image by default. ```quote in 18+, these Docker images are configured to store database data in a format which is compatible with "pg_ctlcluster" (specifically, using major-version-specific directory names). This better reflects how PostgreSQL itself works, and how upgrades are to be performed. See also docker-library/postgres#1259 Counter to that, there appears to be PostgreSQL data in: /var/lib/postgresql/data (unused mount/volume) This is usually the result of upgrading the Docker image without upgrading the underlying database using "pg_upgrade" (which requires both versions). The suggested container configuration for 18+ is to place a single mount at /var/lib/postgresql which will then place PostgreSQL data in a subdirectory, allowing usage of "pg_upgrade --link" without mount point boundary issues. See docker-library/postgres#37 for a (long) discussion around this process, and suggestions for how to do so. ```
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Changelog covers both scenarios to my liking. I think it would be useful to have the clean slate explanation as a general entry in the readme, but maybe that's a case of documenting how Docker works. |
Chriztiaan
approved these changes
Nov 25, 2025
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A minor followup to #55.
This adds a changelog entry for the relevant changes, including some basic instructions for potential demo users.
This also fixes the major version of the Postgres image to the floating
18tag.