What is Diun used for?

Diun watches container registries and sends notifications when a Docker image gets a new tag or changed digest, running as a single binary or container. It is a good fit for knowing when container images are outdated and tracking security rebuilds of base images.

Yes. Diun is open source under the MIT licence. Its source code is on GitHub at crazy-max/diun and is written mainly in Go.

Yes. Diun is open source, so the software itself is free to use.

What are some alternatives to Diun?

Similar open-source tools in the Infrastructure & Containers category include Rancher, Uncloud and Last.Backend. SaaS products in the same category include Docker Desktop, Docker Hub and Amazon ECR.

Is Diun actively maintained?

Yes. The most recent commit to Diun was on 3 September 2026, and the latest release is v4.33.0, published on 30 May 2026. The project has 5k stars on GitHub.

Diun: open-source infrastructure & containers

About Diun

Diun, short for Docker Image Update Notifier, monitors container images and alerts you when a newer version appears. It polls registries for fresh tags or changed digests, so you can follow upstream base image changes, new application versions and security-fix rebuilds without visiting every repository by hand.

It targets self-hosted and automated setups, where staying current matters and silent drift is easy to overlook. Diun can be run as one executable or inside a Docker image, can be pointed at container platforms and configuration files, and sends notifications through services you already use. Repository topics list Gotify, Telegram, Slack, Rocket.Chat, Discord and Pushover, along with Docker Swarm, Kubernetes and Nomad as platforms.

The tool is written in Go and licensed under MIT, with documentation on the author's website. It notifies rather than updating containers itself, which suits home-lab owners and small operations teams that prefer to review updates before applying them.

Key features

Detects new image tags and digest changes
Single binary or Docker image
Notifications to Slack, Telegram and Discord
Works with Docker, Kubernetes and Swarm
Tracks base image and security rebuilds
Configuration through files and labels

Good fit for

→Knowing when container images are outdated
→Tracking security rebuilds of base images

Built with: Go; Docker; Kubernetes
Tags: docker; container-updates; notifications; registry; self-hosted; golang; kubernetes; devops

Diun: questions and answers

What is Diun used for?: Diun watches container registries and sends notifications when a Docker image gets a new tag or changed digest, running as a single binary or container. It is a good fit for knowing when container images are outdated and tracking security rebuilds of base images.
Is Diun open source?: Yes. Diun is open source under the MIT licence. Its source code is on GitHub at crazy-max/diun and is written mainly in Go.
Is Diun free?: Yes. Diun is open source, so the software itself is free to use.
What are some alternatives to Diun?: Similar open-source tools in the Infrastructure & Containers category include Rancher, Uncloud and Last.Backend. SaaS products in the same category include Docker Desktop, Docker Hub and Amazon ECR.
Is Diun actively maintained?: Yes. The most recent commit to Diun was on 3 September 2026, and the latest release is v4.33.0, published on 30 May 2026. The project has 5k stars on GitHub.