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<!ENTITY dhdate "<date>Jul 6, 2007</date>"> |
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<!ENTITY dhucpackage "<refentrytitle>gnt-backup</refentrytitle>"> |
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<!ENTITY dhpackage "gnt-backup"> |
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<!ENTITY debian "<productname>Debian</productname>"> |
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<!ENTITY gnu "<acronym>GNU</acronym>"> |
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<year>2007</year> |
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<holder>Google Inc.</holder> |
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&dhdate; |
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</refentryinfo> |
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<refmeta> |
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&dhucpackage; |
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&dhsection; |
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<refmiscinfo>ganeti 1.2</refmiscinfo> |
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</refmeta> |
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<refnamediv> |
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<refname>&dhpackage;</refname> |
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|
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<refpurpose>ganeti instance import/export</refpurpose> |
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</refnamediv> |
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<refsynopsisdiv> |
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<cmdsynopsis> |
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<command>&dhpackage; </command> |
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|
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<arg choice="req">command</arg> |
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<arg>arguments...</arg> |
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</cmdsynopsis> |
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</refsynopsisdiv> |
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<refsect1> |
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<title>DESCRIPTION</title> |
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|
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<para> |
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The <command>&dhpackage;</command> is used for importing and exporting |
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instances and their configuration from a ganeti system. It is useful for |
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backing instances up and also to migrate them between clusters. |
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</para> |
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|
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</refsect1> |
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<refsect1> |
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<title>COMMANDS</title> |
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|
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<refsect2> |
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<title>EXPORT</title> |
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|
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<cmdsynopsis> |
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<command>export</command> |
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<arg choice="req">-n <replaceable>node</replaceable></arg> |
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<arg>--noshutdown</arg> |
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<arg choice="req"><replaceable>instance</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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Exports an instance to the target node. All the instance data |
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and its configuration will be exported under the |
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/srv/ganeti/exports/<replaceable>instance</replaceable> |
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directory on the target node. |
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</para> |
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|
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<para> |
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The <option>--noshutdown</option> option will create a |
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snapshot disk of the instance without shutting it down first. |
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While this is faster and involves no downtime, it cannot be |
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guaranteed that the instance data will be in a consistent state |
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in the exported dump. |
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</para> |
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|
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<para> |
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Example: |
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<screen> |
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# gnt-backup export -n node1.example.com instance3.example.com |
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</screen> |
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</para> |
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</refsect2> |
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|
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<refsect2> |
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<title>IMPORT</title> |
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<cmdsynopsis> |
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<command>import</command> |
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<arg choice="req">-n <replaceable>node<optional>:secondary-node</optional></replaceable></arg> |
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<arg>-s <replaceable>disksize</replaceable></arg> |
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<arg>--swap-size <replaceable>disksize</replaceable></arg> |
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<arg>-m <replaceable>memsize</replaceable></arg> |
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<arg>-b <replaceable>bridge</replaceable></arg> |
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<sbr> |
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<arg choice="req">-t<group> |
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<arg>diskless</arg> |
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<arg>plain</arg> |
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<arg>local_raid1</arg> |
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<arg>remote_raid1</arg> |
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<arg>drbd</arg> |
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</group> |
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</arg> |
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<sbr> |
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<arg choice="req">--src-node=<replaceable>source-node</replaceable></arg> |
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<arg choice="req">--src-dir=<replaceable>source-dir</replaceable></arg> |
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<arg choice="req"><replaceable>instance</replaceable></arg> |
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</cmdsynopsis> |
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<para> |
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Imports a new instance from an export residing on |
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<replaceable>source-node</replaceable> in |
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<replaceable>source-dir</replaceable>. |
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<replaceable>instance</replaceable> must be in DNS and |
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resolve to a IP in the same network as the nodes in the |
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cluster. |
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</para> |
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|
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<para> |
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The <option>-s</option> option specifies the disk size for |
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the instance, in mebibytes (defaults to |
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<constant>20480MiB</constant> = |
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<constant>20GiB</constant>). You can also use one of the |
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suffixes <literal>m</literal>, <literal>g</literal> or |
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<literal>t</literal> to specificy the exact the units used; |
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these suffixes map to mebibytes, gibibytes and tebibytes. |
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</para> |
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|
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<para> |
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The <option>--swap-size</option> option specifies the swap |
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disk size (in mebibytes) for the instance (the one presented |
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as <filename class="devicefile">/dev/sdb</filename>). The |
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default is <constant>4096MiB</constant>. As for the disk |
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size, you can specify other suffixes. |
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</para> |
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|
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<para> |
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The <option>-m</option> option specifies the memory size for |
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the instance, in mebibytes (defaults to 128 MiB). Again, you |
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can use other suffixes (e.g. <userinput>2g</userinput>). |
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</para> |
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|
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<para> |
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The <option>-b</option> option specifies the bridge to which the |
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instance will be connected. (defaults to the cluster-wide default |
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bridge specified at cluster intialization time). |
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</para> |
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|
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<para> |
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The <option>-t</option> options specifies the disk layout type for |
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the instance. The available choices are: |
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<variablelist> |
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<varlistentry> |
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<term>diskless</term> |
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<listitem> |
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<para> |
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This creates an instance with no disks. Its useful for |
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testing only (or other special cases). |
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</para> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>plain</term> |
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<listitem> |
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<para>Disk devices will be logical volumes.</para> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>local_raid1</term> |
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<listitem> |
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<para> |
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Disk devices will be md raid1 arrays over two local |
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logical volumes. |
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</para> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>remote_raid1</term> |
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<listitem> |
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<para> |
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Disk devices will be md raid1 arrays with one |
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component (so it's not actually raid1): a drbd (0.7.x) |
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device between the instance's primary node and the |
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node given by the second value of the |
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<option>--node</option> option. |
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</para> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>drbd</term> |
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<listitem> |
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<para> |
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Disk devices will be drbd (version 8.x) on top of lvm |
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volumes. They are equivalent in functionality to |
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<replaceable>remote_raid1</replaceable>, but are |
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recommended for new instances (if you have drbd 8.x |
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installed). |
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</para> |
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</listitem> |
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</varlistentry> |
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</variablelist> |
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</para> |
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|
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<para> |
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The optional second value of the <option>--node</option> is used for |
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the remote raid template type and specifies the remote node. |
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</para> |
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|
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<para> |
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If you do not want gnt-backup to wait for the disk mirror |
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to be synced, use the <option>--no-wait-for-sync</option> |
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option. |
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</para> |
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|
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<para> |
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Example: |
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<screen> |
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# gnt-backup import -t plain -s 30 -m 512 -n node1.example.com \ |
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> --src-node=node2.example.com \ |
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> --src-dir=/srv/ganeti/exports/instance3.example.com \ |
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> instance3.example.com |
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</screen> |
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</para> |
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|
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</refsect2> |
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|
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<refsect2> |
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<title>LIST</title> |
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|
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<cmdsynopsis> |
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<command>list</command> |
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<arg>--node=<replaceable>NODE</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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Lists the exports currently available in the default directory |
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in all the nodes of the current cluster, or optionally only a |
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subset of them specified using the <option>--node</option> |
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option (which can be used multiple times) |
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</para> |
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|
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<para> |
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Example: |
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<screen> |
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# gnt-backup list --nodes node1 --nodes node2 |
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</screen> |
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</refsect2> |
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|
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</refsect1> |
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&footer; |
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</refentry> |
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