OK: standby is healthy OK: master is healthy $ /usr/local/bin/check_docker -connection localhost:2376 -containers standby master -health Healthcheck: test: īy adding in a health check section I can cause docker to carry out periodic testing inside the container and pass the result out to my Nagios plugin when it checks. If any of them fail and return a bad result using the Nagios plugin with the -health flag will pickup on any of our internal failings. Using our docker-compose.yml file we can add in the checks we want run inside the container. docker-machine ssh cd /var/lib/boot2docker sudo vi profile Change DOCKERHOST'H tcp://0.' to DOCKERHOST'H tcp://0.' change DOCKERTLSauto to DOCKERTLSno export DOCKERHOST'-H tcp://0. s6 overlay enabled for PID 1 init capabilities. Multi Arch Compatible for amd64, arm arm64. Currently tracking Jessie (8), Stretch (9), Buster (10), Bullseye (11). OK: master status is running OK: standby status is running Dockerfile to build an debian container image to be used as a base for building other images.
$ /usr/local/bin/check_docker -connection localhost:2376 -containers standby master -status running You can even run it from a non-Nagios system at the command line and try it out.
#DEBIAN ENABLE DOCKER REMOTE API INSTALL#
With the API now active I can install and use the Nagios plugin. Now I can visit in a browser and see all the juicy docker data. I created the folder and created the file nf within it, that just contained: ĮxecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2376 -containerd=/run/containerd/containerd.sock To enable the Docker API I followed this guide, but on my distro (Debian Buster) had to look in /usr/lib/systemd/system for my rvice file. When running it can return all kinds of useful json data about our containers. The plugin does require the docker API to be enabled on the docker host. It will return our expected Nagios messages so we can actively monitor the states. Installing container technologies on your instances Install Docker on Compute Engine instances so that you can run your Docker container images on those. We'll cover just the first kind of setup since most of the steps are similar.
For other Linux distros, we need to customize the daemon.json usually located /etc/docker. For Linux distributions that come with systemd we need to customize the Docker service unit. But wouldn’t it be nice to check out what’s going on inside the container too?īy using the Nagios plugin check_docker.py we are able to ping a query to the docker API to find out the condition of the containers. For Fedora, /Red Hat distributions, it would be /etc/sysconfig/docker and for Ubuntu/Debian distributions. We can also enable remote access using a TCP socket. When wanting to monitor the condition of your containers using Nagios there are some really nice features you can enable to check that your containers are up, not abusing the cpu etc.
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