I have many services running on my server and about half of them use postgres. As long as I installed them manually I would always create a new database and reuse the same postgres instance for each service, which seems to me quite logical. The least amount of overhead, fast boot, etc.
But since I started to use docker, most of the docker-compose files come with their own instance of postgres. Until now I just let them do it and were running a couple of instances of postgres. But it’s kind of getting rediciolous how many postgres instances I run on one server.
Do you guys run several dockerized instances of postgres or do you rewrite the docker compose files to give access to your one central postgres instance? And are there usually any problems with that like version incompatibilities, etc.?
I used to, but now I just have one big one (still in Docker) that’s sized and tuned to handle all of my applications.
I’ve only had one version compatibility issue, but that was because I was on pgSQL 13 and the updated version of one application needed 15. Upgrading that didn’t affect any other applications. If it had, I would have just broken that one application out to its own stack-local Postgres.