this post was submitted on 19 Nov 2025
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352
Cloudfare outage post mortem (blog.cloudflare.com)
submitted 23 hours ago by homura1650@lemmy.world to c/technology@lemmy.world
53 comments fedilink hide all child comments
 

The issue was not caused, directly or indirectly, by a cyber attack or malicious activity of any kind. Instead, it was triggered by a change to one of our database systems' permissions which caused the database to output multiple entries into a “feature file” used by our Bot Management system. That feature file, in turn, doubled in size. The larger-than-expected feature file was then propagated to all the machines that make up our network.

The software running on these machines to route traffic across our network reads this feature file to keep our Bot Management system up to date with ever changing threats. The software had a limit on the size of the feature file that was below its doubled size. That caused the software to fail.

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[–] codemankey@programming.dev 19 points 20 hours ago (1 children)

My assumption is that the pattern you describe is possible/doable on certain scales and in certain combinations of technologies. But doing this across a distributed system with as many nodes and as many different nodes as CloudFlare has, and still have a system that can be updated quickly (responding to DDOS attacks for example) is a lot harder.

If you really feel like you have a better solution please contact them and consult for them, the internet would thank you for it.

[–] echodot@feddit.uk -4 points 16 hours ago (1 children)

They know this, it's not like any of this is a revelation. But the company has been lazy and would rather just test in production because that's cheaper and most of the time perfectly fine.

[–] floquant@lemmy.dbzer0.com 2 points 11 hours ago

It looks like you have never read their blog. They do a lot of research and upstream contributions to improve their stack