added annotation to delete a node

Author: Amrita

modules/machineset-manually-scaling.adoc

@@ -28,6 +28,28 @@ $ oc get machinesets -n openshift-machine-api
 +
 The machine sets are listed in the form of `<clusterid>-worker-<aws-region-az>`.
 
+. View the machines that are in the cluster:
++
+[source,terminal]
+----
+$ oc get machine -n openshift-machine-api
+----
+
+. Set the annotation on the machine that you want to delete:
++
+[source,terminal]
+----
+$ oc annotate machine/<machine_name> -n openshift-machine-api machine.openshift.io/cluster-api-delete-machine="true"
+----
+
+. Cordon and drain the node that you want to delete:
++
+[source,terminal]
+----
+$ oc adm cordon <node_name>
+$ oc adm drain <node_name>
+----
+
 . Scale the machine set:
 +
 [source,terminal]
@@ -59,3 +81,12 @@ spec:
 ====
 +
 You can scale the machine set up or down. It takes several minutes for the new machines to be available.
+
+.Verification
+
+* Verify the deletion of the intended machine:
++
+[source,terminal]
+----
+$ oc get machines
+----