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Another ddos attack... again. :) (lemmy.today)
submitted 9 months ago by [M] to c/lemmytoday@lemmy.today
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The attackers found another slow db query to exploit, so had to put some temporary measures in place.

Will post more details later!

This time they actually took down the instance for several hours.

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[–] 1 point 9 months ago* (last edited 9 months ago) (4 children)

Sure! For example, I made a bunch of cross posts with this post as the OG: https://lemmy.today/post/42851505 (posted to lemmy.world, but I can't see this post if I navigate to the instance)

Another example, a cross post of the above to programming.dev: https://lemmy.today/post/42851619 (cannot be found in the instance)

Then a few comments which haven't seemed to federate:

I made more than that though, and I'm pretty sure none of them have federated.

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  • [–] [S] 3 points 9 months ago (2 children)

    I think I figured it out. Has to do with my mitigation of the attack yesterday.

    Now new comments and posts are federating to other instances again, but the old comments and posts, im not sure they will federate.

    Attackers were hammering a certain endpoint to cause the database to be 100% busy in their attack. So i blocked that endpoint, thinking it would not have an effect on federation. Chat gpt also agreed that it wouldnt.

    Chat gpt was wrong. :) So I changed from blocking it to caching it, which is at least going to help prevent further attacks to a degree.

    Thanks for letting me know!

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  • [–] 2 points 9 months ago* (1 child)

    Thanks for the fix! I've reposted some of the content and it seems that federation is working on these. Hopefully I don't end up spamming by accident!

    Edit: it seems like I could have just edited the posts and forced federation that way. TIL!

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  • [–] [S] 2 points 9 months ago*

    Im just looking at new comments or posts in those instances and it all seems to be delayed from the entire fediverse, not just lemmy.today:

    https://programming.dev/c/opensource?dataType=Post&sort=New (last comment 13 hours ago, last post 17 hours ago)

    https://lemmy.world/c/foss?dataType=Comment&sort=New (last comment 18 days ago, last post 18 days ago)

    https://lemmy.zip/c/technology?dataType=Post&sort=New (last comment 5 hours ago, last post 2 hours ago)

    Lets wait and see when these instance communities gets new posts and comments and see if the ones from lemmy.today are still missing. Will keep an eye on them. :)

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