The error is when nova is trying to talk to ironic via the ironic client, there is an auth error:
TRACE nova.api.openstack.extensions raise exc.AmbiguousAuthSystem(e)
2016-02-19 15:38:04.601 TRACE nova.api.openstack.extensions AmbiguousAuthSystem: Must provide Keystone credentials or user-defined endpoint and token
So you need to check your configuration in nova.conf to make sure it has the proper credentials to be able to talk to ironic.
The error is when nova is trying to talk to ironic via the ironic client, there is an auth error:
TRACE nova.api. openstack. extensions raise exc.AmbiguousAu thSystem( e) openstack. extensions AmbiguousAuthSy stem: Must provide Keystone credentials or user-defined endpoint and token
2016-02-19 15:38:04.601 TRACE nova.api.
So you need to check your configuration in nova.conf to make sure it has the proper credentials to be able to talk to ironic.