2. Create API (resource and controller) for Memcached

1. Add controller

   operator-sdk create api --group cache --version v1alpha1 --kind Memcached --resource --controller
   

   result

   Writing kustomize manifests for you to edit...
   Writing scaffold for you to edit...
   api/v1alpha1/memcached_types.go
   internal/controller/memcached_controller.go
   Update dependencies:
   $ go mod tidy
   Running make:
   $ make generate
   /Users/nakamasato/repos/nakamasato/memcached-operator/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
   Next: implement your new API and generate the manifests (e.g. CRDs,CRs) with:
   $ make manifests
   

2. Try running the empty operator

   1. Install CRD.

      make install
      

   2. Run the controller.

      make run
      

   3. Create a new custom resource Memcached.

      kubectl apply -f config/samples/cache_v1alpha1_memcached.yaml
      

   4. Check logs. (Just confirm the controller starts up successfully.)
   5. Cleanup.
      1. Delete CR.

         kubectl delete -f config/samples/cache_v1alpha1_memcached.yaml
         

      2. Stop the controller by ctrl-c.
      3. Uninstll the CRD.

         make uninstall