An NGINX and DNS based outage
I recently encountered a behaviour in Nginx that I didn’t expect and caused a production outage in the process. While I would love to blame DNS for this, as it’s usually the cause of most network-related issues, in this case, the fault lies with Nginx. I was running a very simple Nginx proxy, relaying an internal service to the outside world. The internal service is behind an AWS ALB, and the Nginx configuration was proxying to the ALB’s FQDN:...