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Check Docker

Rating
4 votes
Favoured:
4
Current Version
1.0.3
Last Release Date
2017-07-01
Compatible With
  • Nagios 3.x
License
GPL
Hits
46297
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A plugin to check docker containers. Currently supports checking
memory
restarts
status
health-check results
restarts
uptime
image version(experimental)
Reviews (3)
bynebu, May 21, 2020
Hello Tim,
I managed to get it integrated into nagios core. However, i had following issues, that needed additional configuration for this plugin
1. usermod -aG docker nations (you already mentioned it)
2. i had to create a sudoers file(/etc/sudoers.d/nagios) to allow the plugin to run.
Not sure if the second point is really needed.
bymore_like_NAG-ios, April 10, 2020
1 of 1 people found this review helpful
My devs are happy that they're getting docker alerts before the endusers can report problems which makes me happy

As already mentioned whatever use you have in nrpe.cfg to execute commands will need to be in the docker group. One thing that threw me is that I was still getting permission errors when I added my nagios user to Docker even though the user wasn't logged in. Locally executing the command after su nagios worked just fine by my NRPE checks from my Nagios server were all giving the same permissions error. I wound up having to restart the nrpe service and it resolved my issue.

I'd love some more clarification or a link to relevant Docker documentation on what exactly the --restarts flag is checking, how far back it's checking for restarts, etc.
byjoffrey, October 17, 2016
1 of 1 people found this review helpful
If you use nrpe you'll have an Unable to read output error
Owner's reply

You may have a user permission problem. On Ubuntu at least the NRPE daemon runs as the user 'nagios'. Docker, by default protects it's socket file by requiring membership in the docker group. Try the following
sudo usermod -a -G docker nagios
I will add logic to check for this and give a clearer error in the next release.