F5's BIGIP HTTP Health Monitor

Tags: devops

There’s a http monitor in F5’s BIGIP Local Traffic Managers. Common opinion around the office said that any request returning 200 OK was successful in the eyes of the monitor. We found out this isn’t the case today.

We deployed a blank index.html file at the root of the web server since our application runs under a different context, and the health monitor started to fail. Once we put some content in the file (the text “Nothing to see here” in our case), everything turned green again.

This information is probably in the docs. I’m publishing it here mainly for the sake of my own memory.