this post was submitted on 30 Jun 2023
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[Question] Disk Space for Lemmy and Mastodon instances (lemmy.world)
submitted 1 year ago by [email protected] to c/[email protected]
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Hi, I'm new with self-hosting but managed to set up my own Lemmy and Mastodon instances on a VPS recently. However, I ran into an issue with disk space quite rapidly (which I had way too few, because I started with the cheapest, smallest package for my VPS).

Now I prepare a new setup, where I'll be able to dynamically scale disk space as needed, but this can get expensive quickly. Therefor my question: How much disk space do I typically need for private (1-3 user) instances of Lemmy and Mastodon? Are there settings, where I can limit the disk space utilization (at the cost of older stored content being overwritten)?

I would be fine with needing up to like 30-40 GB, but any more than that would be getting kinda expensive ....

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[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

I can't help with Lemmy, but I've been running a single-user Mastodon instance for almost a year now.

Like you, I found that the media very quickly used up much more disk space than I anticipated. There are a few things you can do.

You can tune how long media is stored for: some of this is done in the admin interface, but really you need to set up cron jobs to regularly run various tootctl commands. This is the crontab I use:

SHELL=/bin/bash
PATH=/home/mastodon/.rbenv/shims:/home/mastodon/.rbenv/bin:/usr/local/bin:/usr/bin:/bin

RAILS_ENV=production
# Remove media attachments older than 8 days
11  19  *   *   *     cd /home/mastodon/live && time bin/tootctl media remove --days 8
# Remove link previews older than 28 days
22  5   *   *   *     cd /home/mastodon/live && time bin/tootctl preview_cards remove --days 28
# Remove files not linked to any post
 3  23  *   *   0     cd /home/mastodon/live && time bin/tootctl media remove-orphans
# Prune remote accounts that never interacted with a local user
44  1   *   *   *     cd /home/mastodon/live && time bin/tootctl accounts prune

You can of course choose even stricter settings but I found that no matter what I did, given that I am following approx 1,000 other Fediverse accounts it still used up more disk space than I was comfortable with.

So I offloaded most of the media storage onto an S3-compatible service. It's breaking the self-hosting ethos somewhat, but with Backblaze B2 I can happily store and serve several hundred GB of media files for just a couple of dollars a month. To me, that was a no-brainer.