Zabbix docker image update monitoring

Monitoring of docker image updates with Zabbix.

Description

Based on “dockcheck” (CLI query to check updates): Github - dockcheck

This template is split into two versions, which you can choose from.

zabbix-dockcheck-simple

Shows count of available docker image updates on a host. Example:

zabbix-dockcheck-lld

Shows the name of the container, which needs an image update. Example:

Important: The Docker image version must be specified with :latest (e.g. in a docker-compose file), a fixed version number such as mariadb:10.6 does not work.

Tested with:

• Zabbix Server 7.0.5 and 7.2
• zabbix-agent2 (on Debian 12 server)

Getting Started

Dependencies

• dockcheck.sh
• regclient/regctl (Licensed under Apache-2.0 License)
• Zabbix-Server with timeouts set up to 30 seconds! (Timeout=30)
• Host with zabbix-agent2 and docker installed

Installing

The installation guide can be found in each version of the template. Choose the one you prefer from the repository.
Quicklinks:

• zabbix-dockcheck-simple
• zabbix-dockcheck-lld

Version History

• 1.1
  • fixed timeout problems in the zabbix-dockcheck-lld with caching on the host (/tmp/dockcheck_cache.txt)
• 1.0
  • split template in two versions, added version which shows the name of the container, which needs an image update (using low level discovery)
• 0.2
  • fixed #2 (dockcheck changed message from "no updates installed" to "no updates available")
  • fixed #2 and #3 (no updates equaled in an error message in zabbix)
• 0.1
  • Initial Release

Acknowledgments

• Github - dockcheck
• Disclaimer: This project partitially used LLMs to understand the Zabbix low level discovery and helped building the script