ec2-api/doc/source/install/metadata-configuration.rst

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EC2 metadata is built in between the nova-metadata and the neutron-metadata,
so we need to configure Neutron so that it sends requests to ec2-api-metadata,
not to the nova.
To configure OpenStack for EC2 API metadata service for Neutron add:
.. code-block:: ini
[DEFAULT]
nova_metadata_port = 8789
to ``/etc/neutron/metadata_agent.ini``
then restart neutron-metadata service.
If you want to obtain metadata via SSL you need to configure neutron:
.. code-block:: ini
[DEFAULT]
nova_metadata_protocol = https
# in case of self-signed certs you may need to specify CA
auth_ca_cert = /path/to/root/cert/if/self/signed
# or skip certs checking
nova_metadata_insecure = True
And then you'll be able to get EC2-API/Nova metadata from neutron via SSL.
Anyway metadata URL inside the server still be http://169.254.169.254