Kubernetes Custom Controller - Custom Resource Handling
Note: the source code is verbosely commented, so the source is meant to be read and to teach
What is this?
An example of a custom Kubernetes controller that's only purpose is to watch for the creation, updating, or deletion of all custom resource of type Network (in the all namespaces). This was created as an exercise to understand how Kubernetes controllers work and interact with the cluster and resources.
Running
Clone repo:
$ git clone https://github.com/resouer/k8s-controller-custom-resource
$ cd k8s-controller-custom-resource
Prepare build environment:
$ go get github.com/tools/godep
$ godep restore
Build and run:
$ go build -o samplecrd-controller .
$ ./samplecrd-controller -kubeconfig=$HOME/.kube/config -alsologtostderr=true
You can also use samplecrd-controller to create a Deployment and run it in Kubernetes. Note in this case, you don't need to specify -kubeconfig in CMD as default InClusterConfig will be used.
Usage
You should create the CRD of Network first:
$ kubectl apply -f crd/network.yaml
You can then trigger an event by creating a Network API instance:
$ kubectl apply -f example/example-network.yaml
CURD the Network API instance, and check the logs of controller.
Enjoy!