Creating controller scaffolding

kubebuilder init --domain junaidk.io --repo github.com/junaidk/image-backup-controller

Makefile Options

Generating manifests

make manifests

Building docker image

make docker-build

Deploying to cluster

make deploy

Removing controller

make undeploy

Running tests

make test

Image Copy

https://github.com/containers/image

This library is used to copy image from source to destination.

Running the operator

Build the image using make docker-build IMG=<some-registry>/<project-name>:tag

Push the image to the registry using make docker-push IMG=<some-registry>/<project-name>:tag

Create secret with registry username and password.

kubectl create secret generic registry-creds \
  --from-literal=username=devuser \
  --from-literal=password='S!B\*d$zDsb='

Update environment variables in config/manager/manager.yaml according to your destination registry.

And update the secret name in config/manager/manager.yaml

Additional namespaces can be added to env IGNORE_NAMESPACES in config/manager/manager.yaml. These will be ignored by controller in addtion to kube-system

Deploy the controller to the cluster using make deploy IMG=<some-registry>/<project-name>:tag

Improvements

• Include Init container in image update process.
• Make image copy concurrent in case of multiple images in one deployment.

asciinema Recording

https://asciinema.org/a/p3HpSVxuKk3duf3zCjGQStsLu