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openstack-manuals/doc/common/section_nova_boot_from_volume.xml
Diane Fleming 04d2015aec Update boot from volume 
Partial-Bug: #1215081

Change-Id: I4972144f9f8dbc1d110a7d0be5a85ba189419b03
author: diane fleming
2013-10-16 07:39:57 +02:00

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<?xml version="1.0" encoding="UTF-8"?>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
xml:id="boot_from_volume">
<title>Launch an instance from a volume</title>
<para>After you create a bootable volume, you can launch an instance
from that volume.</para>
<para>Optionally, to configure your volume, see the <link
xlink:href="http://docs.openstack.org/trunk/config-reference/content/config_overview.html"
><citetitle>OpenStack Configuration
Reference</citetitle></link>.</para>
<procedure xml:id="create_volume_from_image">
<title>To launch an instance from a volume</title>
<step><para>To choose an image to create a bootable volume from, run the
following command to list images:</para>
<screen><prompt>$</prompt> <userinput>nova image-list</userinput>
<computeroutput>+--------------------------------------+---------------------------------+--------+--------+
| ID | Name | Status | Server |
+--------------------------------------+---------------------------------+--------+--------+
| e0b7734d-2331-42a3-b19e-067adc0da17d | cirros-0.3.1-x86_64-uec | ACTIVE | |
| 75bf193b-237b-435e-8712-896c51484de9 | cirros-0.3.1-x86_64-uec-kernel | ACTIVE | |
| 19eee81c-f972-44e1-a952-1dceee148c47 | cirros-0.3.1-x86_64-uec-ramdisk | ACTIVE | |
+--------------------------------------+---------------------------------+--------+--------+</computeroutput></screen></step>
<step>
<para>To create a bootable volume from an image, include the
image ID in the command:</para>
<screen><prompt>#</prompt> <userinput>cinder create --image-id e0b7734d-2331-42a3-b19e-067adc0da17d --display-name my-boot-vol 8</userinput>
<computeroutput>+---------------------+--------------------------------------+
| Property | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2013-10-16T01:27:48.645390 |
| display_description | None |
| display_name | my-boot-vol |
| id | 3195a5a7-fd0d-4ac3-b919-7ba6cbe11d46 |
| image_id | e0b7734d-2331-42a3-b19e-067adc0da17d |
| metadata | {} |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| volume_type | None |
+---------------------+--------------------------------------+</computeroutput></screen>
<para>Before the volume builds, its <literal>bootable</literal>
state is <literal>false</literal>.</para>
</step>
<step>
<para>To list volumes, run the following command:</para>
<screen><prompt>$</prompt> <userinput>cinder list</userinput>
<computeroutput>+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 3195a5a7-fd0d-4ac3-b919-7ba6cbe11d46 | available | my-boot-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+</computeroutput></screen>
<para>Note that the <literal>bootable</literal> state is now
<literal>true</literal>. Copy the value in the
<literal>ID</literal> field for your volume.</para>
</step>
<step xml:id="launch_image_from_volume">
<para>To launch an instance, include the
<parameter>--block_device_mapping</parameter>
parameter:</para>
<screen><prompt>$</prompt> <userinput>nova boot --flavor <replaceable>FLAVOR</replaceable> --block_device_mapping <replaceable>DEVNAME</replaceable>=<replaceable>ID</replaceable>:<replaceable>TYPE</replaceable>:<replaceable>SIZE</replaceable>:<replaceable>DELETE_ON_TERMINATE</replaceable> <replaceable>NAME</replaceable></userinput></screen>
<para>The command arguments are:</para>
<informaltable>
<thead><tr><th>Parameter</th><th>Description</th></tr></thead>
<tbody>
<tr>
<td>
<para><parameter>--flavor</parameter>
<replaceable>FLAVOR</replaceable></para>
</td>
<td>
<para>The flavor ID.</para>
</td>
</tr>
<tr>
<td>
<para><parameter>--block_device_mapping</parameter>
<replaceable>DEVNAME</replaceable>=<replaceable>ID</replaceable>:<replaceable>type</replaceable>:<replaceable>size</replaceable>:<replaceable>delete-on-terminate</replaceable></para>
</td>
<td>
<itemizedlist>
<listitem>
<para><replaceable>DEVNAME</replaceable>. A device
name where the volume is attached in the system at
<filename>/dev/<replaceable>dev_name</replaceable></filename>.
This value is typically
<literal>vda</literal>.</para>
</listitem>
<listitem>
<para><replaceable>ID</replaceable>. The ID of the
volume to boot from, as shown in the output of
<command>nova volume-list</command>.</para>
</listitem>
<listitem>
<para><replaceable>type</replaceable>. Either
<literal>snap</literal> or any other value,
including a blank string. <literal>snap</literal>
means that the volume was created from a
snapshot.</para>
</listitem>
<listitem>
<para><replaceable>size</replaceable>. The size of
the volume, in GBs. It is safe to leave this blank
and have the Compute service infer the
size.</para>
</listitem>
<listitem>
<para><replaceable>delete-on-terminate</replaceable>.
Boolean. Indicates whether the volume is deleted
when the instance is deleted. You can
specify:</para>
<itemizedlist>
<listitem>
<para><literal>True</literal> or
<literal>1</literal>
</para>
</listitem>
<listitem>
<para><literal>False</literal> or
<literal>0</literal></para>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</td>
</tr>
<tr>
<td>
<para><replaceable>NAME</replaceable></para>
</td>
<td>
<para>The name for the server.</para>
</td>
</tr>
</tbody>
</informaltable>
<note>
<para>You must specify an image when booting from a volume,
even though the specified image is not used. Otherwise, the
<literal>Attempt to boot from volume - no image
supplied</literal> error is returned.</para>
</note>
<para>You can also attach a swap disk on boot with the <parameter>--swap</parameter>
flag, or you can attach an ephemeral disk on boot with the <parameter>--ephemeral</parameter> flag.</para>
<para>For example, you might enter the following command to boot
from a volume. The volume is not deleted when the instance is
terminated:</para>
<screen><prompt>$</prompt> <userinput>nova boot --flavor 2 --image e0b7734d-2331-42a3-b19e-067adc0da17d \
--block_device_mapping vda=3195a5a7-fd0d-4ac3-b919-7ba6cbe11d46:::0 myInstanceFromVolume</userinput>
<computeroutput>+-------------------------------------+--------------------------------------+
| Property | Value |
+-------------------------------------+--------------------------------------+
| OS-EXT-STS:task_state | scheduling |
| image | cirros-0.3.1-x86_64-uec |
| OS-EXT-STS:vm_state | building |
| OS-EXT-SRV-ATTR:instance_name | instance-00000003 |
| flavor | m1.small |
| id | 8ed8b0f9-70de-4662-a16c-0b51ce7b17b4 |
| security_groups | [{u'name': u'default'}] |
| user_id | 352b37f5c89144d4ad0534139266d51f |
| OS-DCF:diskConfig | MANUAL |
| accessIPv4 | |
| accessIPv6 | |
| progress | 0 |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-AZ:availability_zone | nova |
| config_drive | |
| status | BUILD |
| updated | 2013-10-16T01:43:26Z |
| hostId | |
| OS-EXT-SRV-ATTR:host | None |
| key_name | None |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None |
| name | myInstanceFromVolume |
| adminPass | BULD33uzYwhq |
| tenant_id | f7ac731cc11f40efbc03a9f9e1d1d21f |
| created | 2013-10-16T01:43:25Z |
| metadata | {} |
+-------------------------------------+--------------------------------------+</computeroutput></screen>
<para>Now when you list volumes, the volume is attached to a
server:</para>
<screen><prompt>$</prompt> <userinput>nova volume-list</userinput>
<computeroutput>+--------------------------------------+-----------+-----------------+------+-------------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+--------------------------------------+
| 3195a5a7-fd0d-4ac3-b919-7ba6cbe11d46 | in-use | my-boot-vol | 8 | None | 8ed8b0f9-70de-4662-a16c-0b51ce7b17b4 |
+--------------------------------------+-----------+-----------------+------+-------------+--------------------------------------+</computeroutput></screen>
</step>
</procedure>
</section>
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