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Cloudflare outage caused by bad software deploy (updated)

🔒 blog.cloudflare.com

Actually caused by a regular expression change.

Unfortunately, one of these rules contained a regular expression that caused CPU to spike to 100% on our machines worldwide. This 100% CPU spike caused the 502 errors that our customers saw. At its worst traffic dropped by 82%.

Reminds me of that great saying…

Some people, when confronted with a problem, think I know, I’ll use regular expressions.” Now they have two problems. (source)


Posted on July 8, 2019

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