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Running Docker Commands with Administration Scripts

Video Lecture

Running Docker Commands with Administration Scripts Running Docker Commands with Administration Scripts Running Docker Commands with Administration Scripts

Description

Running Docker Commands with Zabbix Administration Scripts

In this video, I demonstrate how to use administration scripts to manage docker containers.

During the setup I encounter several issues in which I solve them all.

  1. It's important that the agent, proxy or server process that you want to use to run the script, needs EnableRemoteCommands=1 set in it's config file. Then restart the agent, proxy or server service. The specific details of enabled remote commands depend on which version of the agent you are running, and have been covered several times in the previous sections.

  2. If the command you execute needs privileged permissions, then run it with the sudo prefix.

  3. To allow the zabbix user to use the sudo prefix, add a new line to the sudoers file.

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    sudo visudo

    Add

    zabbix ALL=(ALL) NOPASSWD: /usr/bin/docker

With these 3 things, I was able to execute docker commands on my host using the administration scripts option.

Those commands were, 

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sudo docker ps -a
sudo docker stats -a --no-stream
sudo docker stop nginx2
sudo docker start nginx2

Example Images

To install docker on Ubuntu 20.04. 

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sudo apt install docker.io

To list any docker containers, 

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sudo docker ps -a

To list any docker images that were downloaded to create the containers, 

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sudo docker images

The example containers I created used in the video were from https://hub.docker.com/r/nginxdemos/hello/

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sudo docker run -P -d --name nginx1 nginxdemos/hello
sudo docker run -P -d --name nginx1 nginxdemos/hello
sudo docker run -P -d --name nginx1 nginxdemos/hello

After experimenting with docker containers and images, and you no longer want them, you can clean up your system and delete them using these commands.

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sudo docker rm -f $(sudo docker ps -a -q)
sudo docker rmi -f $(sudo docker images -q)

Troubleshooting

Ensure EnableRemoteCommands=1 is set in your agent/proxy config. And you have restarted your agent/proxy after making the change.

If you get the error, 

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Unsupported item key.
Cannot execute script
It could be many things. It may also be because your agent is connected to the server with only Active checks. The server is unable to find your agent, possibly due to it being on a different network with no firewall rule setup to forward the request from the server. If your agent is behind a firewall, and is using a Zabbix Proxy, then you won't need to configure the firewall as long as your Proxy is also running in Active mode (default).