Table of contents
This page describes what to do in case of an Icinga alert. For more information you could search the govuk-puppet repo for the source of the alert

High zombie procs

You can check what the zombie processes are by SSHing onto the machine and running the command:

ps -A -o user,pid,ppid,state,cmd | awk 'NR==1 || $4=="Z" { print }'

The PPID field gives you the parent process ID, which you may be able to use to diagnose what caused the problem, or at least which process to restart.

If there are a number of zombie processes on one of the backend machines, restarting Imminence (with sudo service imminence restart) may fix the problem; if that doesn’t help, reboot the machine at a convenient time.

This page was last reviewed on 25 February 2019. It needs to be reviewed again on 25 August 2019 by the page owner #govuk-2ndline .
This page was set to be reviewed before 25 August 2019 by the page owner #govuk-2ndline. This might mean the content is out of date.