anchor.diff:  $ oc delete -f deploy/role_binding.yaml
   $ oc delete -f deploy/service_account.yaml
   ----
  +
  +.Additional resources
  +
  +* For more information about OpenAPI v3.0 validation schemas in CRDs, refer to the
  +link:https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/#specifying-a-structural-schema[Kubernetes documentation].
  
positive.code: .. Modify the spec and status of the `Memcached` Custom Resource (CR) at the
  `pkg/apis/cache/v1alpha1/memcached_types.go` file:
  +
  ----
  type MemcachedSpec struct {
  	// Size is the size of the memcached deployment
  
negative.code: +
  ----
  $ operator-sdk generate k8s
  ----
  
  . *Optional: Add custom validation to your CRD.*
  +
  OpenAPI v3.0 schemas are added to CRD manifests in the `spec.validation` block when
  the manifests are generated. This validation block allows Kubernetes to validate
  the properties in a Memcached CR when it is created or updated.
  +
  Additionally, a `pkg/apis/<group>/<version>/zz_generated.openapi.go` file is
  generated. This file contains the Go representation of this validation block if
  the `+k8s:openapi-gen=true annotation` is present above the `Kind` type
  declaration, which is present by default. This auto-generated code is your Go
  `Kind` type's OpenAPI model, from which you can create a full OpenAPI
  Specification and generate a client.
  +
  As an Operator author, you can use Kubebuilder markers (annotations) to
  configure custom validations for your API. These markers must always have a
  `+kubebuilder:validation` prefix. For example, adding an enum-type specification
  can be done by adding the following marker:
  +
  [source,go]
  ----
  // +kubebuilder:validation:Enum=Lion;Wolf;Dragon
  type Alias string
  ----
  +
  Usage of markers in API code is discussed in the Kubebuilder
  link:https://book.kubebuilder.io/reference/generating-crd.html[Generating CRDs]
  and link:https://book.kubebuilder.io/reference/markers.html[Markers for Config/Code Generation]
  documentation. A full list of OpenAPIv3 validation markers is also available in
  the Kubebuilder
  link:https://book.kubebuilder.io/reference/markers/crd-validation.html[CRD Validation]
  documentation.
  +
  If you add any custom validations, run the following command to update the
  OpenAPI validation section in the CRD's
  `deploy/crds/cache.example.com_memcacheds_crd.yaml` file:
  +
  ----
  $ operator-sdk generate openapi
  ----
  +
  .Example generated YAML
  [source,yaml]
  ----
  spec:
    validation:
      openAPIV3Schema:
        properties:
          spec:
            properties:
              size:
                format: int32
                type: integer
  ----
  
  . *Add a new Controller.*
  