Image automation controller

This is part of the image update automation, as outlined in

• this post; and refined in
• this design

Its sibling repository image-reflector-controller implements the image metadata reflection controller (scans container image repositories and reflects the metadata in Kubernetes resources); this repository implements the image update automation controller.

How to install it

Prerequisites

At present this works with GitRepository custom resources as defined in the source-controller types; and, the image-reflector-controller. GitRepository resources are used to describe how to access the git repository to update. The image reflector scans container image metadata, and reflects it into the cluster as resources which this controller uses as input to make updates; for example, by changing deployments so they use the most recent version of an image.

To install the GitRepository CRD

This controller only needs the custom resource definition (CRD) for the GitRepository kind, and doesn't need the source-controller itself.

If you're not already using the GitOps toolkit, you can just install the custom resource definition for GitRepository:

kubectl apply -f https://raw.githubusercontent.com/fluxcd/source-controller/master/config/crd/bases/source.fluxcd.io_gitrepositories.yaml

To install the image reflector controller

This controller relies on the image reflector controller. A working configuration for the latter can be applied straight from the GitHub repository (NB -k):

kubectl apply -k github.com/squaremo/image-reflector-controller/config/default

Installing the automation controller

You can apply a working configuration directly from GitHub:

kubectl apply -k github.com/squaremo/image-automation-controller/config/default

or, in a clone of this repository,

make docker-build deploy

How to use it

TODO