ec2-api/doc/source/install/endpoints-creation.rst

Create the ec2api service API endpoints:

$ openstack endpoint create --region RegionOne ec2api \
  public http://controller:XXXX/
$ openstack endpoint create --region RegionOne ec2api \
  admin http://controller:XXXX/
$ openstack endpoint create --region RegionOne ec2api \
  internal http://controller:XXXX/

• where 'controller' is address of controller,
• and 'XXXX' is port your ec2api is installed on (8788 by default)