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.?
In theorey lots of people recommend having everything in a single docker-compose file for easier transfer and separation, though I have so much running, that it’s grouped by purpose. One of those is data storage. So I have a single server with all the databases (as far as compatibility goes). I would like to some day have a highly available postgres cluster with automatic failover and failback. But that needs a lot of testing and I’m no postgres admin, so also a lot of time to research how to do it properly.