Foreman Maintain

I wrote initial version of a script that gracefully terminates Passenger processes consuming more than 2.5 GB of private RSS memory. Typical consumption of Foreman with Katello and other basic plugins is around 1.5 GB and since only Passenger Enterprise allows to limit maximum amount of RSS memory for processes, this simple script does exactly that:

https://gist.github.com/lzap/8dddbe66ec8d43cbd4277c1de7045c17

Put it into your /etc/cron.hourly/ and make it executable, make sure you read root emails or forward it properly, the script reports all terminations performed on STDOUT. I would like you to test this script in production and get back to me with feedback about what you think.

Motivation is simple - we often introduce bugs in our Rails codebase which performs some eager loading or there are memory leaks in our code or dependencies and Passenger processes can grow up to dozens gigabytes. Unfortunately, there is no other way of getting out other than restarting httpd with passenger. This script could help to avoid situations when production instance starts to swap hard thank to some small regression we introduced. Also administrator will be noticed early via email when this happens so we will keep track of these regressions in production.