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How many PostgreSQL services? (swg-empire.de)

submitted 8 months ago* (last edited 8 months ago) by [email protected] to c/[email protected]

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I want to migrate my Nextcloud instance from MariaDB over to PostgreSQL. I already have a PostgreSQL service running for Lemmy. And I'm pretty starved for RAM.

Would it be better to just have one PostgreSQL service running that serves both Nextcloud and Lemmy? Or should every service have its own PostgreSQL instance?

I'm pretty new to PostgreSQL. But in my mind I would tend towards one service to serve them all and let it figure out by itself how to split resources between everything. Especially when I think that in the long run I will probably migrate more services over to PostgreSQL (and upgrade the RAM).

But maybe I am overlooking something.

Edit: Thanks guys, I've settled for a single instance for now. And after a little tuning everything seems to be running better than ever, with room to spare.

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[–] [email protected] 0 points 8 months ago

Seperate DB container for each service. Three main reasons: 1) if one service requires special configuration that affects the whole DB container, it won’t cross over to the other service which uses that DB container and potentially cause issues, 2) you can keep the version of one of the DB containers back if there is an incompatibility with a newer version of the DB and one of the services that rely on it, 3) you can rollback the dataset for the DB container in the event of a screwup or bad service (e.g. Lemmy) update without affecting other services. In general, I’d recommend only sharing a DB container if you have special DB tuning in place or if the services which use that DB container are interdependent.