Looking to maybe self host my own instance, I’m still learning about the fediverse. If a different instance that I federate with hosts something illegal are there risks to me? Is anything from other instances hosted on my server like a copy of it? Or would I only end up hosting things my users post? I’m paranoid and sorry if this is a silly question.

    • @pe1uca@lemmy.pe1uca.dev
      link
      fedilink
      English
      911 months ago

      I’m running it in the smallest VPS of vultr with 25GB of disk.
      This instance only has 3 users, with me being the only active. It says it’s been up for almost a month and I’ve only used 3GB.

      Here are the docker volumes which have the actual data of your instance, and from inside the DB the biggest table is the one called activity which the devs said it’s only sometimes used to validate the data, but could be truncated if needed (there’s a schedule task which only keeps up to 6 months).
      Also the thing to have in mind is to properly configure the logs of whichever installation guide you follow.
      After that I’ve seen other admins say the next biggest is the media uploaded (from bigger instances).

      $ du -h --max-depth=1
      640K    ./pictrs
      3.2G    ./postgres
      3.2G    .
      
      lemmy=# select
        table_name,
        pg_size_pretty(pg_relation_size(quote_ident(table_name))),
        pg_relation_size(quote_ident(table_name))
      from information_schema.tables
      where table_schema = 'public'
      order by 3 desc;
               table_name         | pg_size_pretty | pg_relation_size
      ----------------------------+----------------+------------------
       activity                   | 2187 MB        |       2292867072
       comment                    | 56 MB          |         58212352
       person                     | 48 MB          |         50307072
       comment_like               | 45 MB          |         47161344
       post_like                  | 22 MB          |         22781952
       comment_aggregates         | 14 MB          |         14811136
       post                       | 13 MB          |         13623296
      
      • gabe565
        link
        fedilink
        English
        611 months ago

        The activity table is also used to deduplicate incoming federation data, so instead of truncating it, I’d suggest deleting rows after a certain amount of time.

        For my personal instance, I set up a cron to delete entries older than 3 days, and my db is only ~500MB with a few weeks of content! I also haven’t seen any duplicated posts or comments. Even with Lemmy’s retries, 3 days seems to be long enough before dropping rows from that table.

        • @ipkpjersi
          link
          English
          2
          edit-2
          11 months ago

          Could you share the cron/script you use to do this? I’m interested in hosting my own Lemmy at some point, and having a script for that cleanup would be hugely helpful for me.

          • gabe565
            link
            fedilink
            English
            211 months ago

            Definitely! I’m hosting in Kubernetes so I won’t post the full thing, but here’s the actual command that I run hourly. Make sure to replace the values for database, username, and password.

            PGPASSWORD=password psql --dbname=database --username=username --command="DELETE FROM activity WHERE published < NOW() - INTERVAL '3 days';"
            
            • @ipkpjersi
              link
              English
              111 months ago

              Awesome, that was just as straightforward as I was hoping it was, thanks! I am more familiar with MySQL as I haven’t used Postgres a ton but SQL is SQL after all lol

              • gabe565
                link
                fedilink
                English
                211 months ago

                You’re welcome! Makes sense. They’re somehow so similar yet so different lol

        • @Thief@lemmy.world
          link
          fedilink
          English
          1
          edit-2
          11 months ago

          Can you help me set this up also or share the script I would run to do this? Many thanks.

          • gabe565
            link
            fedilink
            English
            111 months ago

            Sure! My script will look a little different since I’m hosting Lemmy in Kubernetes, but basically you will want to run the following command hourly. Make sure to replace the values for database, username, and password.

            PGPASSWORD=password psql --dbname=database --username=username --command="DELETE FROM activity WHERE published < NOW() - INTERVAL '3 days';"
            
      • 𝙚𝙧𝙧𝙚
        link
        fedilink
        English
        3
        edit-2
        11 months ago

        How are you keeping your pictrs directory so small?

        Mine is at about 5GB after two weeks with just a single user. 😬

          • 𝙚𝙧𝙧𝙚
            link
            fedilink
            English
            111 months ago

            Did you configure the pictrs API keys for Lemmy and for pictrs?

            If they’re not configured then I could see Lemmy not even using pictrs.

            • @pe1uca@lemmy.pe1uca.dev
              link
              fedilink
              English
              011 months ago

              Ohh!!
              That’s what’s happening, I haven’t uploaded any pictures so I didn’t noticed, aside from that I’m not sure what are the other use cases of pictrs

              • 𝙚𝙧𝙧𝙚
                link
                fedilink
                English
                111 months ago

                Don’t quote me on it but I think it, besides handling image uploads, caches thumbnails for link posts.

        • codus
          link
          fedilink
          English
          111 months ago

          I also have around 3GB used for pictrs and I’m not really sure the best way to see what all content is in there.

          • 𝙚𝙧𝙧𝙚
            link
            fedilink
            English
            211 months ago

            Yeah I haven’t uploaded any images on my instance myself. So none of those images are mine. Might do some reading tomorrow and see if there’s any mention of this in the past on other communities. It’s not an emergency but I’m curious.

              • 𝙚𝙧𝙧𝙚
                link
                fedilink
                English
                211 months ago

                I had found an old post which indicates that post thumbnails are cached. So I guess there’s that.

                In case you didn’t see it, the OP of this thread realized they didn’t setup their pictrs API key… so I guess it’s possible to omit that and lemmy should still work. Not sure about the downsides.

    • Steunarde
      link
      fedilink
      811 months ago

      Well, here’s my first post on the fediverse!

      Background in IT and server administration here. I however do not know much about the intricacies of the fediverse, but am interested in learning. Here’s my two cents based on a background of LAMP stacks for web hosting.

      The required space would likely scale and vary greatly depending on how much content is hosted locally. Assuming minimum space similar to a basic LAMP server it’d likely have starting space requirements of less than 1GB. If local content is primarily text/links to content hosted elsewhere it would take a lot to drastically change that space requirement. Image hosting can vary greatly depending on size, quality, and number of images. Video hosting is an absolute space hog even at fairly low resolutions by today’s standards.

      Bandwidth requirements would scale similar to storage requirements.

      Other specs would also start very low if fediverse requirements are similar to a LAMP stack. Cores are typically more important than core speed in web server hosting as each request will try to use a separate core, but doesn’t need much processing power to provide that request since the server isn’t actually rendering anything.

      Likewise, you shouldn’t need much memory on a web host. Will scale with the number of scripts running on the host but I suspect that shouldn’t be many unless you’re also running moderation bots, but those should ideally be run on a different server instance.

      That said, I’d also be curious to hear from other people that have experience with the fediverse though and other recommended specs to potentially host an instance.

      If anyone has other questions I’m happy to try to help :)