We follow the sample-controller along with the client-go library.
It makes use of the generators in k8s.io/code-generator to generate a typed client, informers, listers and deep-copy functions. You can do this yourself using the ./hack/update-codegen.sh script.
The update-codegen script will automatically generate the following:
pkg/apis/samplecontroller/v1alpha1/zz_generated.deepcopy.gopkg/generated/
Changes should not be made to these files manually, and when creating your own
controller based off of this implementation you should not copy these files and
instead run the update-codegen script to generate your own.
# build custom controller binary:
$ go build -o cnat-controller .
# launch custom controller locally:
$ ./cnat-controller -kubeconfig=$HOME/.kube/config
# after API/CRD changes:
$ ./hack/update-codegen.sh
# register At custom resource definition:
$ kubectl apply -f artifacts/examples/cnat-crd.yaml
# create an At custom resource:
$ kubectl apply -f artifacts/examples/cnat-example.yaml