Another day, another update.

More troubleshooting was done today. What did we do:

  • Yesterday evening @phiresky@[email protected] did some SQL troubleshooting with some of the lemmy.world admins. After that, phiresky submitted some PRs to github.
  • @[email protected] created a docker image containing 3PR’s: Disable retry queue, Get follower Inbox Fix, Admin Index Fix
  • We started using this image, and saw a big drop in CPU usage and disk load.
  • We saw thousands of errors per minute in the nginx log for old clients trying to access the websockets (which were removed in 0.18), so we added a return 404 in nginx conf for /api/v3/ws.
  • We updated lemmy-ui from RC7 to RC10 which fixed a lot, among which the issue with replying to DMs
  • We found that the many 502-errors were caused by an issue in Lemmy/markdown-it.actix or whatever, causing nginx to temporarily mark an upstream to be dead. As a workaround we can either 1.) Only use 1 container or 2.) set proxy_next_upstream timeout; max_fails=5 in nginx.

Currently we’re running with 1 lemmy container, so the 502-errors are completely gone so far, and because of the fixes in the Lemmy code everything seems to be running smooth. If needed we could spin up a second lemmy container using the proxy_next_upstream timeout; max_fails=5 workaround but for now it seems to hold with 1.

Thanks to @[email protected] , @[email protected] , @[email protected], @[email protected] , @[email protected] , @[email protected] for their help!

And not to forget, thanks to @[email protected] and @[email protected] for their continuing hard work on Lemmy!

And thank you all for your patience, we’ll keep working on it!

Oh, and as bonus, an image (thanks Phiresky!) of the change in bandwidth after implementing the new Lemmy docker image with the PRs.

Edit So as soon as the US folks wake up (hi!) we seem to need the second Lemmy container for performance. So that’s now started, and I noticed the proxy_next_upstream timeout setting didn’t work (or I didn’t set it properly) so I used max_fails=5 for each upstream, that does actually work.

    • @BuddahrifficEnglish
      5•1 year ago

      Yeah, even if meta is acting in good faith, looking at what it’s like here now vs Reddit last week vs Reddit a decade ago has me thinking that I don’t really want to be part of a site with such a large community. It’s hard to put into words exactly what it is about this place that is nicer than Reddit, maybe it’s the difference between the kind of person that left and the kind of person that stayed, maybe this place just isn’t popular enough to be targetted by a certain kind of shittiness.

      Whatever it is, I’m worried that meta will bring a bunch of users that have that thing that made fb and Reddit less good over time.

      And then there’s also the angle of anyone can create an instance and suddenly gains a lot of visibility into user activity. Especially a company like meta, though any company could quietly just start sucking up that data. Maybe the fediverse needs different levels of trust between nodes instead of an all or nothing approach. Though tbh I’m still not very familiar with the implementation details or how much sense that even makes for it.