Actually I'm not sure that caching the mapping would be safe in all
cases. The period would have to be so short to avoid the risk of the
port and address being re-assigned that it probably doesn't by that much
** Changed in: neutron
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1235351
Title:
Metadata proxy queries the DB for each request
Status in OpenStack Neutron (virtual network service):
Invalid
Bug description:
The metadata agent has add add the Nova instance_id (i.e port
device_id) to the query headers, which it does via a DB lookup.
However its normal for a Nova VM to make a number of metadata queries
in quick succession, esp during its start-up as cloud-init makes a
separate request for each metadata item. The
network->port->device_id mapping is very stable over a short period of
time, so this data could be cached to improve performance
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