73 lines
3.7 KiB
XML
73 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
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xml:id="sdk_auth_nova">
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<title>Authenticate against a Compute endpoint</title>
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<para>To authenticate against a Compute endpoint, instantiate a
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<link
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xlink:href="http://docs.openstack.org/developer/python-novaclient/api/novaclient.v1_1.client.html#novaclient.v1_1.client.Client"
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> novaclient.v_1_1.client.Client</link> object:</para>
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<programlisting language="python">from os import environ as env
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import novaclient.v1_1.client as nvclient
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nova = nvclient.Client(auth_url=env['OS_AUTH_URL'],
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username=env['OS_USERNAME'],
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api_key=env['OS_PASSWORD'],
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project_id=env['OS_TENANT_NAME'],
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region_name=env['OS_REGION_NAME'])</programlisting>
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<para>Alternatively, you can instantiate a
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<classname>novaclient.client.Client</classname> object and pass
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the version number:</para>
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<programlisting language="python">from os import environ as env
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import novaclient
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nova = novaclient.client.Client("1.1", auth_url=env['OS_AUTH_URL'],
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username=env['OS_USERNAME'],
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api_key=env['OS_PASSWORD'],
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project_id=env['OS_TENANT_NAME'],
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region_name=env['OS_REGION_NAME'])</programlisting>
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<para>If you authenticate against an endpoint that uses a custom
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authentication back end, you must load the authentication plug-in and pass
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it to the constructor.</para>
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<para>The Rackspace public cloud is an OpenStack deployment that
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uses a custom authentication back end. To authenticate against
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this cloud, you must install the <link
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xlink:href="https://pypi.python.org/pypi/rackspace-novaclient/">
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rackspace-novaclient</link> library that contains the Rackspace
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authentication plug-in, called <literal>rackspace</literal>. The
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following Python code shows the additional modifications required
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to instantiate a <classname>Client</classname> object that can
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authenticate against the Rackspace custom authentication back
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end.</para>
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<programlisting language="python">import novaclient.auth_plugin
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import novaclient.v1_1.client as nvclient
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from os import environ as env
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auth_system = 'rackspace'
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auth_plugin = novaclient.auth_plugin.load_plugin('rackspace')
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nova = nvclient.Client(auth_url=env['OS_AUTH_URL'],
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username=env['OS_USERNAME'],
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api_key=env['OS_PASSWORD'],
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project_id=env['OS_TENANT_NAME'],
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region_name=env['OS_REGION_NAME'],
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auth_system='rackspace',
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auth_plugin=auth_plugin)</programlisting>
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<para>If you set the <literal>OS_AUTH_SYSTEM</literal> environment
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variable, check for this variable in your Python script to
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determine whether you need to load a custom authentication back
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end:</para>
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<programlisting language="python">import novaclient.auth_plugin
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import novaclient.v1_1.client as nvclient
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from os import environ as env
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auth_system = env.get('OS_AUTH_SYSTEM', 'keystone')
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if auth_system != "keystone":
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auth_plugin = novaclient.auth_plugin.load_plugin(auth_system)
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else:
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auth_plugin = None
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nova = nvclient.Client(auth_url=env['OS_AUTH_URL'],
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username=env['OS_USERNAME'],
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api_key=env['OS_PASSWORD'],
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project_id=env['OS_TENANT_NAME'],
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region_name=env['OS_REGION_NAME'],
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auth_system=auth_system,
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auth_plugin=auth_plugin)</programlisting>
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</section>
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