Add discovered deployment-rbd dr resources

The ManagedClusterBinding seems to belong to the ramen-ops namespace and
not to the application, so we keep it in the ramen-ops directory.

The rest of the resources are in the deployment-rbd directory. I'm not
sure how easy it will be to share a base kustomization with other
workloads so lets start with something simple.

Unfinished:
- Deployment and enable DR work
- need to test and document disable DR and undeploy

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

README.md

@@ -203,3 +203,55 @@ kubectl delete -k subscription/deployment-k8s-regional-rbd
    ```
 
    At this point the application is managed again by *OCM*.
+
+## Deploy OCM discovered application
+
+The sample application is configured to run cluster `dr1`. To deploy it
+on cluster `dr1` and make it possible to fail over or relocate to
+cluster `dr2` we need to create the namespace on both clusters:
+
+```
+kubectl create ns deployment-rbd --context dr1
+kubectl create ns deployment-rbd --context dr2
+```
+
+To deploy the application apply the deployment-rbd workload to created
+namespace on cluster `dr1`:
+
+```
+kubectl apply -k workloads/deployment/k8s-regional-rbd -n deployment-rbd --context dr1
+```
+
+## Enabling DR for OCM discovered application
+
+Unlike OCM managed applications, the DR resources for all applications
+are in the `ramen-ops` namespace.
+
+To prepare the `ramen-ops` namespaces apply the managed clusterset
+binding resource. This should be done once before enabling DR for
+discovered applications.
+
+```
+kubectl apply -f dr/discovered/ramen-ops/binding.yaml --context hub
+```
+
+To enable DR for the application, apply the DR resources to the hub
+cluster:
+
+```
+kubectl apply -k dr/discovered/deploymnet-rbd --context hub
+```
+
+To set the application placement, patch the placement decision resource
+in the `ramern-ops` namespace on the hub:
+
+```
+kubectl patch placementdecision deployment-rbd-placement-decision \
+    --subresource status \
+    --patch '{"status": {"decisions": [{"clusterName": "dr1", "reason": "dr1"}]}}' \
+    --type merge \
+    --namespace ramen-ops \
+    --context hub
+```
+
+At this point *Ramen* take over and start protecting the application.

dr/discovered/deployment-rbd/drpc.yaml

@@ -0,0 +1,26 @@
+---
+apiVersion: ramendr.openshift.io/v1alpha1
+kind: DRPlacementControl
+metadata:
+  name: drpc
+spec:
+  preferredCluster: dr1
+  drPolicyRef:
+    name: dr-policy
+  placementRef:
+    kind: Placement
+    # Match kustomization namePrefix
+    name: deployment-rbd-placement
+  pvcSelector:
+    matchLabels:
+      appname: busybox
+  protectedNamespaces:
+    - deployment-rbd
+  kubeObjectProtection:
+    captureInterval: 1m
+    kubeObjectSelector:
+      matchExpressions:
+        - key: appname
+          operator: In
+          values:
+            - busybox

dr/discovered/deployment-rbd/kustomization.yaml

@@ -0,0 +1,9 @@
+---
+namespace: ramen-ops
+namePrefix: deployment-rbd-
+commonLabels:
+  app: deployment-rbd
+resources:
+  - drpc.yaml
+  - placement.yaml
+  - placement-decision.yaml

dr/discovered/deployment-rbd/placement-decision.yaml

@@ -0,0 +1,10 @@
+apiVersion: cluster.open-cluster-management.io/v1beta1
+kind: PlacementDecision
+metadata:
+  labels:
+    cluster.open-cluster-management.io/placement: deployment-rbd-placement
+  name: placement-decision
+status:
+  decisions:
+  - clusterName: dr1
+    reason: dr1

dr/discovered/deployment-rbd/placement.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: cluster.open-cluster-management.io/v1beta1
+kind: Placement
+metadata:
+  annotations:
+    cluster.open-cluster-management.io/experimental-scheduling-disable: "true"
+  name: placement
+spec:
+  clusterSets:
+    - default
+  numberOfClusters: 1
+  predicates:
+    - requiredClusterSelector:
+        claimSelector:
+          matchExpressions:
+            - key: name
+              operator: In
+              values:
+                - dr1

dr/discovered/ramen-ops/binding.yaml

@@ -0,0 +1,8 @@
+---
+apiVersion: cluster.open-cluster-management.io/v1beta2
+kind: ManagedClusterSetBinding
+metadata:
+  name: default
+  namespace: ramen-ops
+spec:
+  clusterSet: default