122 lines
7.1 KiB
XML
122 lines
7.1 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="cli_migrate_instances">
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<?dbhtml stop-chunking?>
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<title>Use snapshots to migrate instances</title>
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<para>To use snapshots to migrate instances from OpenStack projects to clouds, complete these steps.</para>
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<procedure>
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<step>
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<para>In the source project, perform the following steps:</para>
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<orderedlist>
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<listitem>
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<para><link linkend="create_snapshot">Create a snapshot of the instance.</link></para>
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</listitem>
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<listitem>
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<para><link linkend="download_snapshot">Download the snapshot as an image.</link></para>
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</listitem>
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</orderedlist></step>
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<step>
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<para>In the destination project, perform the following steps:</para>
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<orderedlist>
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<listitem>
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<para><link linkend="import_snapshot">Import the snapshot to the new environment.</link></para>
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</listitem>
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<listitem>
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<para><link linkend="boot_from_snapshot">Boot a new instance from the snapshot.</link></para>
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</listitem>
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</orderedlist></step>
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</procedure>
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<note>
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<para>Some cloud providers allow only administrators to perform this task.</para>
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</note>
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<section xml:id="create_snapshot">
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<title>Create a snapshot of the instance</title>
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<procedure>
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<step>
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<para>Shut down the source VM before you take the snapshot to ensure that all data is flushed to disk.
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If necessary, list the instances to view get the instance name.</para>
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<screen><prompt>$</prompt> <userinput>nova list</userinput>
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<computeroutput>+--------------------------------------+------------+--------+------------------------------+
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| ID | Name | Status | Networks |
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+--------------------------------------+------------+--------+------------------------------+
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| c41f3074-c82a-4837-8673-fa7e9fea7e11 | myInstance | ACTIVE | private=10.0.0.3 |
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+--------------------------------------+------------+--------+------------------------------+</computeroutput></screen>
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<screen><prompt>$</prompt> <userinput>nova stop example</userinput></screen>
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</step>
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<step>
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<para>Use the <command>nova list</command> command to confirm that the instance shows a
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<literal>SHUTOFF</literal> status.</para>
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<screen><prompt>$</prompt> <userinput>nova list</userinput>
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<computeroutput>+--------------------------------------+------------+---------+------------------------------+
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| ID | Name | Status | Networks |
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+--------------------------------------+------------+---------+------------------------------+
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| c41f3074-c82a-4837-8673-fa7e9fea7e11 | myInstance | SHUTOFF | private=10.0.0.3 |
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+--------------------------------------+------------+---------+------------------------------+</computeroutput></screen>
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</step>
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<step>
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<para>Use the <command>nova
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image-create</command> command to take a snapshot. Use the <command>nova
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image-list</command> command to check the status until the status
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is <literal>ACTIVE</literal>:</para>
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<screen><prompt>$</prompt> <userinput>nova image-create --poll myInstance myInstanceSnapshot</userinput>
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<computeroutput>Instance snapshotting... 50% complete</computeroutput></screen>
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<screen><prompt>$</prompt> <userinput>nova image-list</userinput>
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<computeroutput>+--------------------------------------+---------------------------------+--------+--------+
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| ID | Name | Status | Server |
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+--------------------------------------+---------------------------------+--------+--------+
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| 657ebb01-6fae-47dc-986a-e49c4dd8c433 | cirros-0.3.2-x86_64-uec | ACTIVE | |
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| 72074c6d-bf52-4a56-a61c-02a17bf3819b | cirros-0.3.2-x86_64-uec-kernel | ACTIVE | |
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| 3c5e5f06-637b-413e-90f6-ca7ed015ec9e | cirros-0.3.2-x86_64-uec-ramdisk | ACTIVE | |
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| f30b204e-1ce6-40e7-b8d9-b353d4d84e7d | myInstanceSnapshot | ACTIVE | |
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+--------------------------------------+---------------------------------+--------+--------+</computeroutput></screen>
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</step>
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</procedure>
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</section>
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<section xml:id="download_snapshot">
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<title>Download the snapshot as an image</title>
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<procedure>
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<step>
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<para>Get the image ID:</para>
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<screen><prompt>$</prompt> <userinput>nova image-list</userinput>
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<computeroutput>+--------------------------------------+-------------------+--------+--------------------------------------+
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| ID | Name | Status | Server |
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+--------------------------------------+-------------------+--------+--------------------------------------+
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| f30b204e-1ce6-40e7-b8d9-b353d4d84e7d | myInstanceSnapshot| ACTIVE | c41f3074-c82a-4837-8673-fa7e9fea7e11 |
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+--------------------------------------+-------------------+--------+--------------------------------------+</computeroutput></screen>
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</step>
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<step>
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<para>Download the snapshot by using the image ID that
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was returned in the previous step:</para>
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<screen><prompt>$</prompt> <userinput>glance image-download --file snapshot.raw f30b204e-1ce6-40e7-b8d9-b353d4d84e7d</userinput></screen>
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<note>
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<para>The <command>glance image-download</command>
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command requires the image ID and cannot use
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the image name.</para>
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<para>Ensure there is sufficient space on the
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destination file system for the image
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file.</para>
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</note>
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</step>
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<step>
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<para>Make the image available to the new environment, either through HTTP or with direct upload to a
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machine (<command>scp</command>).</para>
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</step>
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</procedure>
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</section>
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<section xml:id="import_snapshot">
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<title>Import the snapshot to new environment</title>
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<para>In the new project or cloud environment, import
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the snapshot:</para>
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<screen><prompt>$</prompt> <userinput>glance image-create --copy-from <replaceable>IMAGE_URL</replaceable></userinput></screen>
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</section>
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<section xml:id="boot_from_snapshot">
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<title>Boot a new instance from the snapshot</title>
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<para>In the new project or cloud environment, use the
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snapshot to create the new instance:</para>
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<screen><prompt>$</prompt> <userinput>nova boot --flavor m1.tiny --image myInstanceSnapshot myNewInstance</userinput></screen>
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</section>
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</section>
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