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It was confusing at first
(lemmy.world)
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this post was submitted on 15 Jun 2023
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150 MB of RAM is a bit optimistic. However I agree that you should be okish with cheap 1GB 1vCPU VMs for a one user instance.
Maybe even host it on an old laptop you can use as a server.
The 150MB metric was based on the documentation estimate. I would say that remains correct for my solo instance. The only caveat would be that postegres adds, at current, about 200MB of usage on top of that. Nginx and postfix add just about nothing memory-wise.
This may bloat up over time, or if I had a bunch of users I'm certain it would, but we're not really talking about hosting large communities in this case, so I'd say 512MB of RAM with no other software could probably do the trick as a bare minimum. For those hosting proper communities, 100% future proof and go bigger than that.
In my case I started with 4GB but had to double because there seems to be some memory creep / leak that gets reset when you reboot the server.
Of course, I'm hosting 50 active users and communities with over 200 subscribers.
Overall I would say that Lemmy is indeed lightweight.