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Copyright 2010-2011 United States Government as represented by the
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Administrator of the National Aeronautics and Space Administration.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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The configuration of these binaries relies on "flagfiles" using the google
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$ nova-xxxxx --flagfile flagfile
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The binaries can all run on the same machine or be spread out amongst multiple boxes in a large deployment.
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Nova api receives xml requests and sends them to the rest of the system. It is a wsgi app that routes and authenticate requests. It supports the ec2 and openstack apis.
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Nova objectstore is an ultra simple file-based storage system for images that replicates most of the S3 Api. It will soon be replaced with Glance (http://glance.openstack.org) and a simple image manager.
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Nova compute is responsible for managing virtual machines. It loads a Service object which exposes the public methods on ComputeManager via rpc.
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Nova volume is responsible for managing attachable block storage devices. It loads a Service object which exposes the public methods on VolumeManager via rpc.
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Nova network is responsible for managing floating and fixed ips, dhcp, bridging and vlans. It loads a Service object which exposes the public methods on one of the subclasses of NetworkManager. Different networking strategies are as simple as changing the network_manager flag::
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$ nova-network --network_manager=nova.network.manager.FlatManager
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IMPORTANT: Make sure that you also set the network_manager on nova-api and nova_compute, since make some calls to network manager in process instead of through rpc. More information on the interactions between services, managers, and drivers can be found :ref:`here <service_manager_driver>`
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doc/source/runnova/binaries.rst
