sample-operator

Sample Operator

The sample operator creates a custom resources and watches for changes.

Code Generation

K8s 1.8 requires code generation for all CRDs. See the code generation sample for the steps taken to generate the necessary types for this walkthrough. You can skip those details if all you want to do is get the sample running.

Build

# from the root of the repo pull all the libraries needed for operator-kit (this may take a while with all the Kubernetes dependencies)
dep ensure

# change directory to sample-operator
cd sample-operator

# build the sample operator binary
CGO_ENABLED=0 GOOS=linux go build

# build the docker container
# Note: If you are using minikube, don't forget to run "eval $(minikube docker-env)" first!
docker build -t sample-operator:0.1 .

Start the Operator

# Create the sample operator
$ kubectl create -f sample-operator.yaml

# Wait for the pod status to be Running
$ kubectl get pod -l app=sample-operator
NAME                              READY     STATUS    RESTARTS   AGE
sample-operator-821691060-m5vqp   1/1       Running   0          3m

# View the samples CRD
$ kubectl get crd samples.myproject.io
NAME                   KIND
samples.myproject.io   CustomResourceDefinition.v1beta1.apiextensions.k8s.io

Create the Sample Resource

# Create the sample
$ kubectl create -f sample-resource.yaml

# See the sample resource
$ kubectl get samples.myproject.io
NAME       KIND
mysample   Sample.v1alpha1.myproject.io

Modify the Sample Resource

Change the value of the Hello property in sample-resource.yaml, then apply the new yaml.

kubectl apply -f sample-resource.yaml

Logs

Notice the added and modified Hello= text in the log below

$ kubectl logs -l app=sample-operator
Getting kubernetes context
Creating the sample resource
Managing the sample resource
Added Sample 'mysample' with Hello=world!
Updated sample 'mysample' from world to goodbye!

Cleanup

kubectl delete -f sample-resource.yaml
kubectl delete -f sample-operator.yaml
kubectl delete crd samples.myproject.io