quantum metadata agent

quantum-metadata-agent  推測為openstack grizzly的new feature。

The OpenStack Compute service allows VMs to query metadata associated with a VM by making a web request to a special 169.254.169.254 address. Quantum supports proxying those requests to nova-api, even when the requests are made from isolated networks, or from multiple networks that use overlapping IP addresses. Enabling this requires setting the following fields in nova.conf


http://docs.openstack.org/trunk/openstack-network/admin/content/nova_config_metadata.html