Description of problem:

When exposing a service, we should only be able to associate it with a hostname if it's not already bound to another service. In other words, if we ran:

oc expose service hello --hostname=hello.example.com

running it for a second time for a different service or perhaps even the same service should result in a failure since the hostname "hello.example.com" is already bound to a service.

Version-Release number of selected component (if applicable):

3.1.1

How reproducible:


Steps to Reproduce:
1. oc expose service hello --hostname=hello.example.com
2. oc expose service world --hostname=hello.example.com

Actual results:

Both records are inserted.

Expected results:

An error message saying that the hostname is already associated with an existing service.


Additional info: