title: docker how to connect to external DNS
body: <p>I have docker container (lets say A) running on a host (lets say X). I would like the container to be able to have outbound connectivity to a DNS (ie ELB) that host X already has access to.</p>
  
  <p>ie 
  container A ---> want to be able to curl an external ELB DNS endpoint...problem is container unable to resolve it!</p>
  
  <p>host X ---> is able to curl the external ELB DNS endpoint already</p>