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 →