cbc80898a6
Moved firewall section from CRG Compute to CAG Compute. Renamed log-file chapter to match other 'file' chapter. Moved Compute sections into files to trim down the massive Compute chapter file. Edited touched files. In section_cli_nova_volumes.xml, added example and one new option. In section_compute-rootwrap.xml, added note with NFS share info. In section_system-admin.xml: * Added new services. * Replaced deprecated nova-manage commands with nova. Change-Id: Ie300a9ce25d305b80bb0b21d3cfc318909f3a123
74 lines
4.5 KiB
XML
74 lines
4.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xml:id="section_compute-instance-building-blocks"
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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"
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version="5.0">
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<title>Instance building blocks</title>
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<para>In OpenStack, the base operating system is usually copied from an image stored in the
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OpenStack Image Service. This is the most common case and results in an ephemeral instance
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that starts from a known template state and loses all accumulated states on shutdown.</para>
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<para>You can also put an operating system on a persistent volume in Compute or the Block
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Storage volume system. This gives a more traditional, persistent system that accumulates
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states, which are preserved across restarts. To get a list of available images on your
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system, run:
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<screen><prompt>$</prompt> <userinput>nova image-list</userinput>
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<?db-font-size 50%?><computeroutput>+--------------------------------------+-------------------------------+--------+--------------------------------------+
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| ID | Name | Status | Server |
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+--------------------------------------+-------------------------------+--------+--------------------------------------+
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| aee1d242-730f-431f-88c1-87630c0f07ba | Ubuntu 12.04 cloudimg amd64 | ACTIVE | |
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| 0b27baa1-0ca6-49a7-b3f4-48388e440245 | Ubuntu 12.10 cloudimg amd64 | ACTIVE | |
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| df8d56fc-9cea-4dfd-a8d3-28764de3cb08 | jenkins | ACTIVE | |
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+--------------------------------------+-------------------------------+--------+--------------------------------------+</computeroutput></screen>
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</para>
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<para>The displayed image attributes are:</para>
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<variablelist>
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<varlistentry>
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<term><literal>ID</literal></term>
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<listitem>
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<para>Automatically generated UUID of the image.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>Name</literal></term>
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<listitem>
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<para>Free form, human-readable name for image.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>Status</literal></term>
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<listitem>
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<para>The status of the image. Images marked
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<literal>ACTIVE</literal> are available
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for use.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>Server</literal></term>
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<listitem>
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<para>For images that are created as snapshots of
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running instances, this is the UUID of the
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instance the snapshot derives from. For
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uploaded images, this field is blank.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Virtual hardware templates are called <literal>flavors</literal>. The default
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installation provides five flavors. By default, these are configurable by administrative
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users. However, you can change this behavior by redefining the access controls for
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<parameter>compute_extension:flavormanage</parameter> in
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<filename>/etc/nova/policy.json</filename> on the <filename>compute-api</filename>
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server.</para>
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<para>For a list of flavors that are available on your system, run:</para>
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<screen><prompt>$</prompt> <userinput>nova flavor-list</userinput>
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<computeroutput>+----+-----------+-----------+------+-----------+------+-------+-------------+
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| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor |
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+----+-----------+-----------+------+-----------+------+-------+-------------+
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| 1 | m1.tiny | 512 | 1 | N/A | 0 | 1 | |
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| 2 | m1.small | 2048 | 20 | N/A | 0 | 1 | |
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| 3 | m1.medium | 4096 | 40 | N/A | 0 | 2 | |
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| 4 | m1.large | 8192 | 80 | N/A | 0 | 4 | |
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| 5 | m1.xlarge | 16384 | 160 | N/A | 0 | 8 | |
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+----+-----------+-----------+------+-----------+------+-------+-------------+
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</computeroutput></screen>
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</section> |