twk in | April 12, 2021 One Subtle Regex Takes Down Cloudflare The Downtime Project One Subtle Regex Takes Down Cloudflare Play Episode Pause Episode Mute/Unmute Episode Rewind 10 Seconds 1x Fast Forward 30 seconds 00:00 / 54:51 Subscribe Share Apple Podcasts Stitcher Google Podcasts Spotify RSS Feed Share Link Embed On July 2, 2019, a subtle issue in a regular expression took down Cloudflare (and with it, a large portion of the internet) for 30 minutes. twk Published April 12, 2021
Thanks for talking about this. I greatly enjoyed hearing an external person’s view of what happened that day.
Thanks John, and thanks for writing such an exceptional post mortem. It was truly educational and I walked away extremely impressed with your engineering team and processes. You guys have earned the right to be such a key part of the internet’s infrastructure.