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
Warning
This document has not been updated for a while now. It may be out of date.
Last updated:
5 Apr 2022
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.