“Service Unavailable?” Servers normal. Now what?
What happens when you get a service unavailable alert but all your server monitors show normal state? How can you respond to such an alert?
When discussing this with one of Nolio’s customers, a large online bank operation, they told me that in the past, in cases of a ’service unreachable’ alert with green servers, they didn’t really know what the source of the problem was. The first thing they would do when troubleshooting this type of problems is look into their monitoring system and check if there are problematic servers, but in most cases the issue is in the application layer, where some services or processes are stalled.
