Argo CD Image Updater is a tool to automatically update the container images of Kubernetes workloads which are managed by Argo CD. In a nutshell, it will track image versions specified by annotations on the Argo CD Application resources and update them by setting parameter overrides using the Argo CD API.
Currently it will only work with applications that are built using Kustomize or Helm tooling. Applications built from plain YAML or custom tools are not supported yet (and maybe never will).
Read the documentation for more information on how to setup and run Argo CD Image Updater and to get known to it's features and limitations.
Above URL points to the documentation for the current release. If you are interested in documentation of upcoming features, check out the the latest documentation which is up-to-date with the master branch.
Disclaimer: This is pre-release code. It might have bugs that will break things in unexpected way.
Argo CD Image Updater was born just recently, and is not suitable for production workloads yet. You are welcome to test it in your non-critical environments, and to contribute by filing bugs, enhancement requests or even better, sending in pull requests.
We decided to publish the code early, so that the community can be involved early on in the development process, too.
Important note: Until the first stable version (i.e. v1.0) is released,
breaking changes between the releases must be expected. We will do our best
to indicate all breaking changes (and how to un-break them) in the
Changelog
You are welcome to contribute to this project by means of raising issues for bugs, sending & discussing enhancment ideas or by contributing code via pull requests.
In any case, please be sure that you have read & understood the currently known design limitations before raising issues.
Also, if you want to contribute code, please make sure that your code
- has its functionality covered by unit tests (coverage goal is 80%),
- is correctly linted,
- is well commented,
- and last but not least is compatible with our license and CLA
Please note that in the current early phase of development, the code base is a fast moving target and lots of refactoring will happen constantly.
argocd-image-updater is open source software, released under the
Apache 2.0 license
The following things are on the roadmap until the v1.0 release
-
Extend Argo CD functionality to be able to update images for other types of applications.
-
Extend Argo CD functionality to write back to Git
-
Provide web hook support to trigger update check for a given image
-
Use concurrency for updating multiple applications at once
-
Improve error handling
-
Support for image tags with i.e. Git commit SHAs
For more details, check out the v1.0.0 milestone
Does it write back the changes to Git?
No, and this feature is also not planned for any of the next releases. We think it's close to impossible to get such a feature 100% correctly working, because there are so many edge-cases to consider (i.e. possible merge conflicts) and there's no easy way to find out where a certain resource lives in Git when manifests are rendered through a tool. We are thinking about how to implement this feature in the meanwhile, but don't expect it before the v1.0 release.
How does it persist the changes then?
The Argo CD Image Updater leverages the Argo CD API to set application paramaters, and Argo CD will then persist the change in the application's manifest. This is something Argo CD will not overwrite upon the next manual (or automatic) sync, except when the overrides are explicitly set in the manifest.
Are there plans to extend functionality beyond Kustomize or Helm?
Not yet, since we are dependent upon what functionality Argo CD provides for these types of applications.
Will it ever be fully integrated with Argo CD?
In the current form, probably not. If there is community demand for it, let's see how we can make this happen.
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