Host Names

You must determine whether the data service ever needs to know the host name of the server on which it is running. If so, the data service might need to be modified to use a logical hostname, rather than the physical hostname. In this sense, a logical hostname is a host name that is configured into a logical hostname resource that is located in the same resource group as the application resource.

Occasionally, in the client-server protocol for a data service, the server returns its own hostname to the client as part of the contents of a message to the client. For such protocols, the client could be depending on this returned hostname as the host name to use when contacting the server. For the returned hostname to be usable after a failover or switchover, the hostname should be a logical hostname of the resource group, not the name of the physical host. In this case, you must modify the data service code to return the logical hostname to the client.