Which command would create a service representing an external host named customerdb.oracle.com?

• A. oc create service externalname customerdb --external-name customerdb.oracle.uk
• B. oc create service externalname customerdb --external-name customerdb.oracle.com
• C. oc create service clusterip customerdb --external-name customerdb.oracle.com
• D. oc create service headless customerdb --external-name customerdb.oracle.com

Answer: (B)

ExternalName services are used to create a DNS alias inside the cluster that points to an external host. They don’t allocate a cluster IP; instead, the service name resolves to the specified external destination, allowing pods to reach an external resource using a stable internal name.

The appropriate command creates a service named customerdb of type ExternalName and sets its external-name to the exact host customerdb.oracle.com. This maps the internal service name to that external address, letting applications connect to the external database as if it were a local service.

The other options either use different internal service types (which would create an internal ClusterIP or a headless service and not map to an external host) or specify a different external-name that wouldn’t point to the requested host.