neither EC2 api nor openstack API expose the hostname

[Jimmy Bergman]

It would be great if there was a way to retrieve the generated hostname for an instance (i.e. the content of the hostname column of the instances table), preferably in both the EC2 and the openstack API.

I guess for the EC2 api, we could change:
privateDnsName to have the hostname instead of fixed_ip since the IPs are available anyway.

For the openstack api, I think the following would be the cleanest solution:
diff --git a/nova/api/openstack/v2/schemas/v1.1/server.rng b/nova/api/openstack/v2/schemas/v1.1/server.rng
index 2e86ccf..b3d0a7d 100644
--- a/nova/api/openstack/v2/schemas/v1.1/server.rng
+++ b/nova/api/openstack/v2/schemas/v1.1/server.rng
@@ -7,6 +7,7 @@
   <attribute name="updated"> <text/> </attribute>
   <attribute name="created"> <text/> </attribute>
   <attribute name="hostId"> <text/> </attribute>
+ <attribute name="hostname"> <text/> </attribute>
   <attribute name="accessIPv4"> <text/> </attribute>
   <attribute name="accessIPv6"> <text/> </attribute>
   <attribute name="status"> <text/> </attribute>

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/1916
Committed: http://github.com/openstack/nova/commit/88acbe869a22075306999b095ba87a4069a3beac
Submitter: Jenkins
Branch: master

 status fixcommitted
 done

commit 88acbe869a22075306999b095ba87a4069a3beac
Author: Jimmy Bergman <email address hidden>
Date: Mon Nov 28 12:33:58 2011 +0100

    Fix for EC2 API part of bug 897164

    Change-Id: I96344eaccd2f42b70223b3c155a4793ab00d09d5

[Scott Moser (smoser)]

This change makes devstack nearly unusable.

Now, a euca-describe-instances shows:
$ euca-describe-instances i-00000003
RESERVATION r-jwxxgohs 2 default
INSTANCE i-00000003 ami-00000007 server-3 server-3 running mykey 1 m1.small 2011-12-08T01:40:06Z nova

previously, it would show:
$ euca-describe-instances i-00000003
RESERVATION r-jwxxgohs 2 default
INSTANCE i-00000003 ami-00000007 10.0.0.4 10.0.0.4 running mykey 1 m1.small 2011-12-08T01:40:06Z nova

The reason this is bad, is that I have no way of turning 'server-3' into '10.0.0.4', rendering the system basically unreachable.

[Thierry Carrez (ttx)]

Filed bug 901594 to track this regression