e84da9e7b6
Editing the nested sections for the compute chapter. Mostly grammar,
wording, style, convention, etc. This patch includes service groups,
image management, building blocks, management tools, and nova networking.
Watch this space for more.
Partial-Bug: #1251195
Change-Id: I07c021b653787dd95ffeba70e67f9b66f6eb242c
76 lines
4.6 KiB
XML
76 lines
4.6 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"
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version="5.0"
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xml:id="section_compute-instance-building-blocks">
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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
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image stored in the OpenStack Image Service. This results in an
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ephemeral instance that starts from a known template state and loses all
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accumulated states on shutdown.</para>
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<para>You can also put an operating system on a persistent volume in
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Compute or the Block Storage volume system. This gives a more traditional,
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persistent system that accumulates states that are preserved across
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restarts. To get a list of available images on your system, run:</para>
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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 14.04 cloudimg amd64 | ACTIVE | |
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| 0b27baa1-0ca6-49a7-b3f4-48388e440245 | Ubuntu 14.10 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>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 the 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>.
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The default installation provides five predefined flavors.</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 | Is_Public |
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+-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
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| 1 | m1.tiny | 512 | 1 | 0 | | 1 | 1.0 | True |
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| 2 | m1.small | 2048 | 20 | 0 | | 1 | 1.0 | True |
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| 3 | m1.medium | 4096 | 40 | 0 | | 2 | 1.0 | True |
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| 4 | m1.large | 8192 | 80 | 0 | | 4 | 1.0 | True |
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| 5 | m1.xlarge | 16384 | 160 | 0 | | 8 | 1.0 | True |
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+-----+-----------+-----------+------+-----------+------+-------+-------------+-----------+</computeroutput></screen>
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<para>By default, administrative users can configure the flavors. You
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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
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<filename>compute-api</filename> server.</para>
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</section>
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