238 lines
9.9 KiB
XML
238 lines
9.9 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_compute_apis">
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<title>Compute</title>
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<?dbhtml stop-chunking?>
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<para>To use the information in this section, you should have a
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general understanding of OpenStack Compute.</para>
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<section xml:id="sdk_compute_env">
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<title>Set environment variables</title>
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<para>Please see <xref linkend="sdk_auth"/> on how to setup environmental variables
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and authenticate against Compute API endpoints.</para>
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</section>
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<section xml:id="sdk_compute_get_nova_credentials_v2">
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<title>Get nova credentials v2</title>
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<para>The examples in this section use the
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<code>get_nova_credentials_v2</code> method:</para>
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<programlisting language="python">def get_nova_credentials_v2():
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d = {}
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d['version'] = '2'
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d['username'] = os.environ['OS_USERNAME']
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d['api_key'] = os.environ['OS_PASSWORD']
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d['auth_url'] = os.environ['OS_AUTH_URL']
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d['project_id'] = os.environ['OS_TENANT_NAME']
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return d</programlisting>
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<para>This code resides in the
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<filename>credentials.py</filename> file, which all
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samples import.</para>
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<para>Use the <code>get_nova_credentials_v2()</code> method to
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populate and get a dictionary:</para>
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<programlisting language="python">credentials = get_nova_credentials_v2()</programlisting>
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</section>
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<section xml:id="sdk_compute_list_servers">
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<title>List servers v2</title>
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<para>The following program lists servers using the v2 APIs:</para>
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<procedure>
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<title>To list the servers</title>
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<step>
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<para>Import the following modules:</para>
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<programlisting language="python">from credentials import get_nova_credentials_v2
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from novaclient.client import Client</programlisting>
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</step>
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<step>
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<para>Get Nova Credentials. See <xref
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linkend="sdk_compute_get_nova_credentials_v2"
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/>.</para>
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</step>
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<step>
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<para>Instantiate the <literal>nova_client</literal>
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client object by using the
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<literal>credentials</literal> dictionary
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object:</para>
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<programlisting language="python">
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nova_client = Client(**credentials)</programlisting>
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</step>
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<step>
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<para>Get the list of servers by calling <literal>servers.list</literal> on
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<literal>nova_client</literal> object:</para>
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<programlisting language="python">print(nova_client.servers.list())</programlisting>
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</step>
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</procedure>
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<example>
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<title>List servers: complete code listing</title>
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<programlisting language="python">#!/usr/bin/python
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# -*- coding: utf-8 -*-
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from credentials import get_nova_credentials_v2
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from novaclient.client import Client
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credentials = get_nova_credentials_v2()
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nova_client = Client(**credentials)
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print(nova_client.servers.list())</programlisting>
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</example>
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</section>
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<section xml:id="sdk_compute_create_server_v2">
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<title>Create a server v2</title>
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<para>The following program creates a server (VM) using the v2 APIs:</para>
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<procedure>
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<title>To create a server</title>
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<step>
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<para>Import the following modules:</para>
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<programlisting language="python">import time
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from credentials import get_nova_credentials_v2
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from novaclient.client import Client</programlisting>
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</step>
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<step>
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<para>Get Nova Credentials. See <xref
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linkend="sdk_compute_get_nova_credentials_v2"
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/>.</para>
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</step>
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<step>
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<para>Instantiate the <literal>nova_client</literal>
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client object by using the
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<literal>credentials</literal> dictionary
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object:</para>
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<programlisting language="python">
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nova_client = Client(**credentials)</programlisting>
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</step>
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<step>
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<para>In this step, search for the flavor and image to be used for creating a server.
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The following code assumes <literal>
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cirros</literal> image and <literal>m1.tiny</literal> are being used.</para>
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<programlisting language="python">image = nova_client.images.find(name="cirros")
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flavor = nova_client.flavors.find(name="m1.tiny")</programlisting>
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</step>
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<step>
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<para></para>
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<programlisting language="python">image = nova_client.images.find(name="cirros")
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flavor = nova_client.flavors.find(name="m1.tiny")</programlisting>
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</step>
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<step>
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<para>In this step determine the network with which the server is going to
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be attached. Use this along with flavor and image to create the server.
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</para>
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<programlisting language="python">net_id = 'd05a7729-4bcf-4149-9d8f-6a4764520a04'
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nic_d = [{'net-id': net_id}]
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instance = nova_client.servers.create(name="vm2", image=image,
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flavor=flavor, key_name="keypair-1", nics=nic_d)</programlisting>
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</step>
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<step>
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<para>Sleep for 5 secs and check if the server/vm got created by calling
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<literal>nova_client.servers.list()</literal>
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</para>
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<programlisting language="python">print("Sleeping for 5s after create command")
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time.sleep(5)
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print("List of VMs")
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print(nova_client.servers.list)</programlisting>
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</step>
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</procedure>
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<example>
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<title>Create server: complete code listing</title>
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<programlisting language="python">#!/usr/bin/python
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# -*- coding: utf-8 -*-
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import time
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from credentials import get_nova_credentials_v2
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from novaclient.client import Client
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try:
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credentials = get_nova_credentials_v2()
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nova_client = Client(**credentials)
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image = nova_client.images.find(name="cirros")
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flavor = nova_client.flavors.find(name="m1.tiny")
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net_id = 'd05a7729-4bcf-4149-9d8f-6a4764520a04'
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nic_d = [{'net-id': net_id}]
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instance = nova_client.servers.create(name="vm2", image=image,
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flavor=flavor, key_name="keypair-1", nics=nic_d)
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print("Sleeping for 5s after create command")
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time.sleep(5)
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print("List of VMs")
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print(nova_client.servers.list())
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finally:
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print("Execution Completed")</programlisting>
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</example>
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</section>
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<section xml:id="sdk_compute_delete_server_v2">
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<title>Delete server v2</title>
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<para>The following program deletes a Server (VM) using the v2 API:</para>
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<procedure>
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<title>To Delete a Server</title>
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<step>
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<para>Import the following modules:</para>
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<programlisting language="python">import time
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from credentials import get_nova_credentials_v2
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from novaclient.client import Client</programlisting>
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</step>
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<step>
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<para>Get Nova Credentials. See <xref
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linkend="sdk_compute_get_nova_credentials_v2"
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/>.</para>
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</step>
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<step>
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<para>Instantiate the <literal>nova_client</literal>
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client object by using the
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<literal>credentials</literal> dictionary
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object:</para>
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<programlisting language="python">
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nova_client = Client(**credentials)</programlisting>
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</step>
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<step>
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<para>Check if the server <literal>"vm1"</literal> exists using the following steps</para>
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<procedure>
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<step><para>Get the list of servers: <literal>servers_list</literal></para></step>
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<step><para>Iterate over the <literal>servers_list</literal> and compare name with <literal>"vm1"
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</literal></para></step>
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<step><para>If true set the variable name <literal>server_exists</literal> as
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<literal>True</literal> and break from the for loop</para>
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</step>
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</procedure>
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<programlisting language="python">servers_list = nova_client.servers.list()
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server_del = "vm1"
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server_exists = False
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for s in servers_list:
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if s.name == server_del:
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print("This server %s exists" % server_del)
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server_exists = True
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break</programlisting>
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</step>
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<step>
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<para>If the server exists execute <literal>delete</literal> method of
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<literal>nova_client.servers</literal> object.</para>
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<programlisting language="python">nova_client.servers.delete(s)</programlisting>
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</step>
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</procedure>
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<example>
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<title>Delete: complete code listing</title>
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<programlisting language="python">#!/usr/bin/python
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# -*- coding: utf-8 -*-
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from credentials import get_nova_credentials_v2
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from novaclient.client import Client
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credentials = get_nova_credentials_v2()
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nova_client = Client(**credentials)
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servers_list = nova_client.servers.list()
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server_del = "vm1"
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server_exists = False
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for s in servers_list:
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if s.name == server_del:
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print("This server %s exists" % server_del)
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server_exists = True
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break
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if not server_exists:
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print("server %s does not exist" % server_del)
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else:
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print("deleting server..........")
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nova_client.servers.delete(s)
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print("server %s deleted" % server_del)</programlisting>
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</example>
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</section>
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</section>
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