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This repo demonstrates the ability to pass config from operator to application and deploy the operator in kustomize way so that the overlays can be applied for different cluster environments.

In the example below, an operator is created and deployed to install the application. The application/service will print a message Hello <deploy_env>!. The <deploy_env> is a string that is passed from the operator to the application. The example uses overlay with kustomize generating the config map and operator deployment yaml file.

  • build the hello-world image
pushd hello-image
docker build . -t adrian555/hello-world:v0.0.1
docker push adrian555/hello-world:v0.0.1
popd
  • build the hello-world operator, which creates the hello-world-app deployment and hello-world service
pushd hello-world
operator-sdk build adrian555/hello-op:v0.0.1
docker push adrian555/hello-op:v0.0.1
popd
  • deploy the operator
pushd hello-kustomize/<dir>
kustomize build > y.yaml
kubectl apply -f y.yaml
popd

Note: replace <dir> with base, overlays/production or overlays/staging to generate the specific deployment for your cluster environment.

  • install the application by apply a CustomResource to the operator
pushd hello-world/deploy/crds
kubectl apply -f ibm_v1alpha1_hello_cr.yaml
popd
  • wait until the hello-world service is up and running
kubectl get svc
## NAME                  TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE
## hello-world           LoadBalancer   172.21.204.30   169.62.90.107   80:31308/TCP   13m
  • ping the service
curl http://169.62.90.107:31308
## Hello staging!

The service returns the specified config for each kustomize base or overlay setting.