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<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN" [ |
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<!-- Fill in your name for FIRSTNAME and SURNAME. --> |
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<!-- Please adjust the date whenever revising the manpage. --> |
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<!ENTITY dhdate "<date>June 08, 2010</date>"> |
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<!-- SECTION should be 1-8, maybe w/ subsection other parameters are |
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allowed: see man(7), man(1). --> |
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<!ENTITY dhsection "<manvolnum>8</manvolnum>"> |
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<!ENTITY dhucpackage "<refentrytitle>gnt-node</refentrytitle>"> |
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<!ENTITY dhpackage "gnt-node"> |
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|
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<!ENTITY debian "<productname>Debian</productname>"> |
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<!ENTITY gnu "<acronym>GNU</acronym>"> |
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<!ENTITY gpl "&gnu; <acronym>GPL</acronym>"> |
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<!ENTITY footer SYSTEM "footer.sgml"> |
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]> |
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|
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<refentry> |
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<refentryinfo> |
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<copyright> |
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<year>2006</year> |
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<year>2007</year> |
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<year>2008</year> |
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<year>2009</year> |
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<holder>Google Inc.</holder> |
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</copyright> |
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&dhdate; |
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</refentryinfo> |
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<refmeta> |
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&dhucpackage; |
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|
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&dhsection; |
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<refmiscinfo>Ganeti 2.2</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>Node administration</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 managing the |
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(physical) nodes in the Ganeti system. |
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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>ADD</title> |
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|
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<cmdsynopsis> |
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<command>add</command> |
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<arg>--readd</arg> |
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<arg>-s <replaceable>secondary_ip</replaceable></arg> |
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<arg>-g <replaceable>nodegroup</replaceable></arg> |
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<arg choice="req"><replaceable>nodename</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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Adds the given node to the cluster. |
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</para> |
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|
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<para> |
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This command is used to join a new node to the cluster. You |
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will have to provide the password for root of the node to be |
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able to add the node in the cluster. The command needs to be |
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run on the Ganeti master. |
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</para> |
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|
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<para> |
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Note that the command is potentially destructive, as it will |
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forcibly join the specified host the cluster, not paying |
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attention to its current status (it could be already in a |
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cluster, etc.) |
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</para> |
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|
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<para> |
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The <option>-s</option> is used in dual-home clusters and |
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specifies the new node's IP in the secondary network. See the |
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discussion in <citerefentry> |
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<refentrytitle>gnt-cluster</refentrytitle> |
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<manvolnum>8</manvolnum> </citerefentry> for more |
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information. |
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</para> |
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|
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<para> |
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In case you're readding a node after hardware failure, you can |
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use the <option>--readd</option> parameter. In this case, you |
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don't need to pass the secondary IP again, it will reused from |
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the cluster. Also, the <literal>drained</literal> and |
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<literal>offline</literal> flags of the node will be cleared |
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before re-adding it. |
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</para> |
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|
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<para> |
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The <option>-g</option> is used to add the new node into a specific |
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node group, specified by uuid or name. If only one node group exists |
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you can skip this option, otherwise it's mandatory. |
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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-node add node5.example.com |
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# gnt-node add -s 192.0.2.5 node5.example.com |
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# gnt-node add -g group2 -s 192.0.2.9 node9.group2.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>ADD-TAGS</title> |
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|
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<cmdsynopsis> |
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<command>add-tags</command> |
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<arg choice="opt">--from <replaceable>file</replaceable></arg> |
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<arg choice="req"><replaceable>nodename</replaceable></arg> |
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<arg choice="req" |
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rep="repeat"><replaceable>tag</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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Add tags to the given node. If any of the tags contains |
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invalid characters, the entire operation will abort. |
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</para> |
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|
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<para> |
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If the <option>--from</option> option is given, the list of |
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tags will be extended with the contents of that file (each |
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line becomes a tag). In this case, there is not need to pass |
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tags on the command line (if you do, both sources will be |
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used). A file name of - will be interpreted as stdin. |
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</para> |
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</refsect2> |
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|
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<refsect2> |
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<title>EVACUATE</title> |
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|
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<cmdsynopsis> |
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<command>evacuate</command> |
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<arg>-f</arg> |
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<arg>--early-release</arg> |
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<group> |
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<arg>--iallocator <replaceable>NAME</replaceable></arg> |
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<arg>--new-secondary <replaceable>destination_node</replaceable></arg> |
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</group> |
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<arg choice="req" rep="repeat"><replaceable>node</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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This command will move all secondary instances away from the |
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given node(s). It works only for instances having a drbd disk |
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template. |
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</para> |
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|
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<para> |
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The new location for the instances can be specified in two ways: |
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<itemizedlist> |
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<listitem> |
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<simpara>as a single node for all instances, via the |
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<option>--new-secondary</option> option</simpara> |
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</listitem> |
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<listitem> |
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<simpara>or via the <option>--iallocator</option> option, |
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giving a script name as parameter, so each instance will |
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be in turn placed on the (per the script) optimal |
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node</simpara> |
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</listitem> |
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</itemizedlist> |
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</para> |
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|
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<para> |
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The <option>--early-release</option> changes the code so that |
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the old storage on node being evacuated is removed early |
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(before the resync is completed) and the internal Ganeti locks |
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are also released for both the current secondary and the new |
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secondary, thus allowing more parallelism in the cluster |
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operation. This should be used only when recovering from a |
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disk failure on the current secondary (thus the old storage is |
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already broken) or when the storage on the primary node is |
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known to be fine (thus we won't need the old storage for |
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potential recovery). |
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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-node evacuate -I dumb node3.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>FAILOVER</title> |
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|
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<cmdsynopsis> |
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<command>failover</command> |
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<arg>-f</arg> |
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<arg>--ignore-consistency</arg> |
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<arg choice="req"><replaceable>node</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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This command will fail over all instances having the given |
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node as primary to their secondary nodes. This works only for |
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instances having a drbd disk template. |
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</para> |
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|
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<para> |
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Normally the failover will check the consistency of the disks |
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before failing over the instance. If you are trying to migrate |
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instances off a dead node, this will fail. Use the |
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<option>--ignore-consistency</option> option for this purpose. |
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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-node failover node1.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>INFO</title> |
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|
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<cmdsynopsis> |
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<command>info</command> |
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<arg rep="repeat"><replaceable>node</replaceable></arg> |
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</cmdsynopsis> |
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|
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<para> |
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Show detailed information about the nodes in the cluster. If you |
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don't give any arguments, all nodes will be shows, otherwise the |
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output will be restricted to the given names. |
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</para> |
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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>--sync</arg> |
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<sbr> |
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<arg>--no-headers</arg> |
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<arg>--separator=<replaceable>SEPARATOR</replaceable></arg> |
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<sbr> |
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<arg>--units=<replaceable>UNITS</replaceable></arg> |
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<arg>-o <replaceable>[+]FIELD,...</replaceable></arg> |
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<sbr> |
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<arg>--roman</arg> |
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<sbr> |
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<arg rep="repeat">node</arg> |
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</cmdsynopsis> |
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|
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<para> |
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Lists the nodes in the cluster. |
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</para> |
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|
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<para> |
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The <option>--no-headers</option> option will skip the initial |
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header line. The <option>--separator</option> option takes an |
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argument which denotes what will be used between the output |
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fields. Both these options are to help scripting. |
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</para> |
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|
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<para> |
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The units used to display the numeric values in the output |
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varies, depending on the options given. By default, the values |
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will be formatted in the most appropriate unit. If the |
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<option>--separator</option> option is given, then the values |
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are shown in mebibytes to allow parsing by scripts. In both |
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cases, the <option>--units</option> option can be used to |
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enforce a given output unit. |
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</para> |
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|
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<para> |
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By default, the query of nodes will be done in parallel with |
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any running jobs. This might give inconsistent results for the |
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free disk/memory. The <option>--sync</option> can be used to |
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grab locks for all the nodes and ensure consistent view of the |
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cluster (but this might stall the query for a long time). |
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</para> |
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|
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<para> |
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Passing the <option>--roman</option> option gnt-node list will try to |
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output some of its fields in a latin-friendly way. This is not the |
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default for backwards compatibility. |
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</para> |
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|
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<para> |
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The <option>-o</option> option takes a comma-separated list of |
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output fields. The available fields and their meaning are: |
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<variablelist> |
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<varlistentry> |
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<term>name</term> |
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<listitem> |
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<simpara>the node name</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>pinst_cnt</term> |
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<listitem> |
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<simpara>the number of instances having this node as |
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primary</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>pinst_list</term> |
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<listitem> |
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<simpara>the list of instances having this node as |
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primary, comma separated</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>sinst_cnt</term> |
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<listitem> |
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<simpara>the number of instances having this node as a |
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secondary node</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>sinst_list</term> |
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<listitem> |
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<simpara>the list of instances having this node as a |
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secondary node, comma separated</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>pip</term> |
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<listitem> |
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<simpara>the primary ip of this node (used for cluster |
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communication)</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>sip</term> |
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<listitem> |
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<simpara> |
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the secondary ip of this node (used for data |
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replication in dual-ip clusters, see <citerefentry> |
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<refentrytitle>gnt-cluster</refentrytitle> |
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<manvolnum>8</manvolnum> |
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</citerefentry> |
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</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>dtotal</term> |
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<listitem> |
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<simpara>total disk space in the volume group used for |
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instance disk allocations</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>dfree</term> |
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<listitem> |
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<simpara>available disk space in the volume group</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>mtotal</term> |
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<listitem> |
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<simpara>total memory on the physical node</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>mnode</term> |
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<listitem> |
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<simpara>the memory used by the node itself</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>mfree</term> |
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<listitem> |
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<simpara>memory available for instance |
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allocations</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>bootid</term> |
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<listitem> |
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<simpara>the node bootid value; this is a linux specific |
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feature that assigns a new UUID to the node at each boot |
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and can be use to detect node reboots (by tracking |
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changes in this value)</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>tags</term> |
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<listitem> |
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<simpara>comma-separated list of the node's |
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tags</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>serial_no</term> |
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<listitem> |
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<simpara>the so called 'serial number' of the node; |
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this is a numeric field that is incremented each time |
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the node is modified, and it can be used to detect |
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modifications</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>ctime</term> |
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<listitem> |
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<para> |
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the creation time of the node; note that this field |
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contains spaces and as such it's harder to parse |
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</para> |
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<para> |
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if this attribute is not present (e.g. when upgrading |
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from older versions), then "N/A" will be shown instead |
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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>mtime</term> |
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<listitem> |
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<para> |
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the last modification time of the node; note that this |
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field contains spaces and as such it's harder to parse |
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</para> |
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<para> |
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if this attribute is not present (e.g. when upgrading |
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from older versions), then "N/A" will be shown instead |
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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>uuid</term> |
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<listitem> |
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<simpara>Show the UUID of the node (generated |
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automatically by Ganeti)</simpara> |
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</listitem> |
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</varlistentry> |
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|
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<varlistentry> |
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<term>ctotal</term> |
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<listitem> |
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<simpara>the toal number of logical processors</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
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<term>cnodes</term> |
460 |
<listitem> |
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<simpara>the number of NUMA domains on the node, if the |
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hypervisor can export this information</simpara> |
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</listitem> |
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</varlistentry> |
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<varlistentry> |
466 |
<term>csockets</term> |
467 |
<listitem> |
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<simpara>the number of physical CPU sockets, if the |
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hypervisor can export this information</simpara> |
470 |
</listitem> |
471 |
</varlistentry> |
472 |
<varlistentry> |
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<term>master_candidate</term> |
474 |
<listitem> |
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<simpara>whether the node is a master candidate or not</simpara> |
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</listitem> |
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</varlistentry> |
478 |
<varlistentry> |
479 |
<term>drained</term> |
480 |
<listitem> |
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<simpara>whether the node is drained or not; the cluster |
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still communicates with drained nodes but excludes them |
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from allocation operations</simpara> |
484 |
</listitem> |
485 |
</varlistentry> |
486 |
<varlistentry> |
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<term>offline</term> |
488 |
<listitem> |
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<simpara>whether the node is offline or not; if offline, |
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the cluster does not communicate with offline nodes; |
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useful for nodes that are not reachable in order to |
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avoid delays</simpara> |
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</listitem> |
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</varlistentry> |
495 |
<varlistentry> |
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<term>role</term> |
497 |
<listitem> |
498 |
<para> |
499 |
A condensed version of the node flags; this field will |
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output a one-character field, with the following |
501 |
possible values: |
502 |
<itemizedlist> |
503 |
<listitem> |
504 |
<simpara><emphasis>M</emphasis> for the master |
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node</simpara> |
506 |
</listitem> |
507 |
<listitem> |
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<simpara><emphasis>C</emphasis> for a master |
509 |
candidate</simpara> |
510 |
</listitem> |
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<listitem> |
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<simpara><emphasis>R</emphasis> for a regular |
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node</simpara> |
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</listitem> |
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<listitem> |
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<simpara><emphasis>D</emphasis> for a drained |
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node</simpara> |
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</listitem> |
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<listitem> |
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<simpara><emphasis>O</emphasis> for an offline |
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node</simpara> |
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</listitem> |
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</itemizedlist> |
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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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|
530 |
<para> |
531 |
If the value of the option starts with the character |
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<constant>+</constant>, the new fields will be added to the |
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default list. This allows to quickly see the default list plus |
534 |
a few other fields, instead of retyping the entire list of |
535 |
fields. |
536 |
</para> |
537 |
|
538 |
<para> |
539 |
Note that some of this fields are known from the configuration |
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of the cluster (e.g. <simplelist type="inline"> |
541 |
<member>name</member> <member>pinst</member> |
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<member>sinst</member> <member>pip</member> |
543 |
<member>sip</member> </simplelist> and thus the master does |
544 |
not need to contact the node for this data (making the listing |
545 |
fast if only fields from this set are selected), whereas the |
546 |
other fields are "live" fields and we need to make a query to |
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the cluster nodes. |
548 |
</para> |
549 |
|
550 |
<para> |
551 |
Depending on the virtualization type and implementation |
552 |
details, the mtotal, mnode and mfree may have slighly varying |
553 |
meanings. For example, some solutions share the node memory |
554 |
with the pool of memory used for instances |
555 |
(<acronym>KVM</acronym>), whereas others have separate memory |
556 |
for the node and for the instances (Xen). |
557 |
</para> |
558 |
|
559 |
<para> |
560 |
If no node names are given, then all nodes are |
561 |
queried. Otherwise, only the given nodes will be listed. |
562 |
</para> |
563 |
</refsect2> |
564 |
|
565 |
<refsect2> |
566 |
<title>LIST-TAGS</title> |
567 |
|
568 |
<cmdsynopsis> |
569 |
<command>list-tags</command> |
570 |
<arg choice="req"><replaceable>nodename</replaceable></arg> |
571 |
</cmdsynopsis> |
572 |
|
573 |
<para>List the tags of the given node.</para> |
574 |
</refsect2> |
575 |
|
576 |
<refsect2> |
577 |
<title>MIGRATE</title> |
578 |
<cmdsynopsis> |
579 |
<command>migrate</command> |
580 |
<arg>-f</arg> |
581 |
<arg>--non-live</arg> |
582 |
<arg>--migration-mode=live|non-live</arg> |
583 |
<arg choice="req"><replaceable>node</replaceable></arg> |
584 |
</cmdsynopsis> |
585 |
|
586 |
<para> |
587 |
This command will migrate all instances having the given |
588 |
node as primary to their secondary nodes. This works only for |
589 |
instances having a drbd disk template. |
590 |
</para> |
591 |
|
592 |
<para> |
593 |
As for the <command>gnt-instance migrate</command> command, |
594 |
the options <option>--no-live</option> |
595 |
and <option>--migration-mode</option> can be given to |
596 |
influence the migration type. |
597 |
</para> |
598 |
|
599 |
<para> |
600 |
Example: |
601 |
<screen> |
602 |
# gnt-node migrate node1.example.com |
603 |
</screen> |
604 |
</para> |
605 |
|
606 |
</refsect2> |
607 |
|
608 |
<refsect2> |
609 |
<title>MODIFY</title> |
610 |
<cmdsynopsis> |
611 |
<command>modify</command> |
612 |
<arg>-f</arg> |
613 |
<arg>--submit</arg> |
614 |
<arg>--master-candidate=<option>yes|no</option></arg> |
615 |
<arg>--drained=<option>yes|no</option></arg> |
616 |
<arg>--offline=<option>yes|no</option></arg> |
617 |
<arg>--auto-promote</arg> |
618 |
<arg choice="req"><replaceable>node</replaceable></arg> |
619 |
</cmdsynopsis> |
620 |
|
621 |
<para> |
622 |
This command changes the role of the node. Each options takes |
623 |
either a literal <literal>yes</literal> or |
624 |
<literal>no</literal>, and only one option should be given as |
625 |
<literal>yes</literal>. The meaning of the roles are described |
626 |
in the manpage <citerefentry> |
627 |
<refentrytitle>ganeti</refentrytitle> <manvolnum>7</manvolnum> |
628 |
</citerefentry>. |
629 |
</para> |
630 |
|
631 |
<para> |
632 |
In case a node is demoted from the master candidate role, the |
633 |
operation will be refused unless you pass |
634 |
the <option>--auto-promote</option> option. This option will |
635 |
cause the operation to lock all cluster nodes (thus it will |
636 |
not be able to run in parallel with most other jobs), but it |
637 |
allows automated maintenance of the cluster candidate pool. If |
638 |
locking all cluster node is too expensive, another option is |
639 |
to promote manually another node to master candidate before |
640 |
demoting the current one. |
641 |
</para> |
642 |
|
643 |
<para> |
644 |
Example (setting a node offline, which will demote it from |
645 |
master candidate role if is in that role): |
646 |
<screen> |
647 |
# gnt-node modify --offline=yes node1.example.com |
648 |
</screen> |
649 |
</para> |
650 |
|
651 |
<para>Example (setting the node back to online and master candidate): |
652 |
<screen> |
653 |
# gnt-node modify --offline=no --master-candidate=yes node1.example.com |
654 |
</screen> |
655 |
</para> |
656 |
|
657 |
</refsect2> |
658 |
|
659 |
<refsect2> |
660 |
<title>REMOVE</title> |
661 |
|
662 |
<cmdsynopsis> |
663 |
<command>remove</command> |
664 |
<arg choice="req"><replaceable>nodename</replaceable></arg> |
665 |
</cmdsynopsis> |
666 |
|
667 |
<para> |
668 |
Removes a node from the cluster. Instances must be removed or |
669 |
migrated to another cluster before. |
670 |
</para> |
671 |
|
672 |
<para> |
673 |
Example: |
674 |
<screen> |
675 |
# gnt-node remove node5.example.com |
676 |
</screen> |
677 |
</para> |
678 |
</refsect2> |
679 |
|
680 |
<refsect2> |
681 |
<title>REMOVE-TAGS</title> |
682 |
<cmdsynopsis> |
683 |
<command>remove-tags</command> |
684 |
<arg choice="opt">--from <replaceable>file</replaceable></arg> |
685 |
<arg choice="req"><replaceable>nodename</replaceable></arg> |
686 |
<arg choice="req" |
687 |
rep="repeat"><replaceable>tag</replaceable></arg> |
688 |
</cmdsynopsis> |
689 |
|
690 |
<para> |
691 |
Remove tags from the given node. If any of the tags are not |
692 |
existing on the node, the entire operation will abort. |
693 |
</para> |
694 |
|
695 |
<para> |
696 |
If the <option>--from</option> option is given, the list of |
697 |
tags will be extended with the contents of that file (each |
698 |
line becomes a tag). In this case, there is not need to pass |
699 |
tags on the command line (if you do, both sources will be |
700 |
used). A file name of - will be interpreted as stdin. |
701 |
</para> |
702 |
</refsect2> |
703 |
|
704 |
<refsect2> |
705 |
<title>VOLUMES</title> |
706 |
|
707 |
<cmdsynopsis> |
708 |
<command>volumes</command> |
709 |
<arg>--no-headers</arg> |
710 |
<arg>--human-readable</arg> |
711 |
<arg>--separator=<replaceable>SEPARATOR</replaceable></arg> |
712 |
<arg>--output=<replaceable>FIELDS</replaceable></arg> |
713 |
<sbr> |
714 |
<arg rep="repeat"><replaceable>node</replaceable></arg> |
715 |
</cmdsynopsis> |
716 |
|
717 |
<para> |
718 |
Lists all logical volumes and their physical disks from the node(s) |
719 |
provided. |
720 |
</para> |
721 |
|
722 |
<para> |
723 |
The <option>--no-headers</option> option will skip the initial |
724 |
header line. The <option>--separator</option> option takes an |
725 |
argument which denotes what will be used between the output |
726 |
fields. Both these options are to help scripting. |
727 |
</para> |
728 |
|
729 |
<para> |
730 |
The units used to display the numeric values in the output |
731 |
varies, depending on the options given. By default, the values |
732 |
will be formatted in the most appropriate unit. If the |
733 |
<option>--separator</option> option is given, then the values |
734 |
are shown in mebibytes to allow parsing by scripts. In both |
735 |
cases, the <option>--units</option> option can be used to |
736 |
enforce a given output unit. |
737 |
</para> |
738 |
|
739 |
<para> |
740 |
The <option>-o</option> option takes a comma-separated list of |
741 |
output fields. The available fields and their meaning are: |
742 |
<variablelist> |
743 |
<varlistentry> |
744 |
<term>node</term> |
745 |
<listitem> |
746 |
<simpara>the node name on which the volume exists</simpara> |
747 |
</listitem> |
748 |
</varlistentry> |
749 |
<varlistentry> |
750 |
<term>phys</term> |
751 |
<listitem> |
752 |
<simpara>the physical drive (on which the LVM physical |
753 |
volume lives)</simpara> |
754 |
</listitem> |
755 |
</varlistentry> |
756 |
<varlistentry> |
757 |
<term>vg</term> |
758 |
<listitem> |
759 |
<simpara>the volume group name</simpara> |
760 |
</listitem> |
761 |
</varlistentry> |
762 |
<varlistentry> |
763 |
<term>name</term> |
764 |
<listitem> |
765 |
<simpara>the logical volume name</simpara> |
766 |
</listitem> |
767 |
</varlistentry> |
768 |
<varlistentry> |
769 |
<term>size</term> |
770 |
<listitem> |
771 |
<simpara>the logical volume size</simpara> |
772 |
</listitem> |
773 |
</varlistentry> |
774 |
<varlistentry> |
775 |
<term>instance</term> |
776 |
<listitem> |
777 |
<simpara>The name of the instance to which this volume |
778 |
belongs, or (in case it's an orphan volume) the |
779 |
character <quote>-</quote></simpara> |
780 |
</listitem> |
781 |
</varlistentry> |
782 |
</variablelist> |
783 |
</para> |
784 |
|
785 |
<para> |
786 |
Example: |
787 |
<screen> |
788 |
# gnt-node volumes node5.example.com |
789 |
Node PhysDev VG Name Size Instance |
790 |
node1.example.com /dev/hdc1 xenvg instance1.example.com-sda_11000.meta 128 instance1.example.com |
791 |
node1.example.com /dev/hdc1 xenvg instance1.example.com-sda_11001.data 256 instance1.example.com |
792 |
</screen> |
793 |
</para> |
794 |
</refsect2> |
795 |
|
796 |
<refsect2> |
797 |
<title>LIST-STORAGE</title> |
798 |
|
799 |
<cmdsynopsis> |
800 |
<command>list-storage</command> |
801 |
<arg>--no-headers</arg> |
802 |
<arg>--human-readable</arg> |
803 |
<arg>--separator=<replaceable>SEPARATOR</replaceable></arg> |
804 |
<arg>--storage-type=<replaceable>STORAGE_TYPE</replaceable></arg> |
805 |
<arg>--output=<replaceable>FIELDS</replaceable></arg> |
806 |
<sbr> |
807 |
<arg rep="repeat"><replaceable>node</replaceable></arg> |
808 |
</cmdsynopsis> |
809 |
|
810 |
<para> |
811 |
Lists the available storage units and their details for the |
812 |
given node(s). |
813 |
</para> |
814 |
|
815 |
<para> |
816 |
The <option>--no-headers</option> option will skip the initial header |
817 |
line. The <option>--separator</option> option takes an argument which |
818 |
denotes what will be used between the output fields. Both these options |
819 |
are to help scripting. |
820 |
</para> |
821 |
|
822 |
<para> |
823 |
The units used to display the numeric values in the output varies, |
824 |
depending on the options given. By default, the values will be |
825 |
formatted in the most appropriate unit. If the |
826 |
<option>--separator</option> option is given, then the values are shown |
827 |
in mebibytes to allow parsing by scripts. In both cases, the |
828 |
<option>--units</option> option can be used to enforce a given output |
829 |
unit. |
830 |
</para> |
831 |
|
832 |
<para> |
833 |
The <option>--storage-type</option> option can be used to choose a |
834 |
storage unit type. Possible choices are <literal>lvm-pv</literal>, |
835 |
<literal>lvm-vg</literal> or <literal>file</literal>. |
836 |
</para> |
837 |
|
838 |
<para> |
839 |
The <option>-o</option> option takes a comma-separated list of |
840 |
output fields. The available fields and their meaning are: |
841 |
<variablelist> |
842 |
<varlistentry> |
843 |
<term>node</term> |
844 |
<listitem> |
845 |
<simpara>the node name on which the volume exists</simpara> |
846 |
</listitem> |
847 |
</varlistentry> |
848 |
<varlistentry> |
849 |
<term>type</term> |
850 |
<listitem> |
851 |
<simpara>the type of the storage unit (currently just |
852 |
what is passed in via |
853 |
<option>--storage-type</option>)</simpara> |
854 |
</listitem> |
855 |
</varlistentry> |
856 |
<varlistentry> |
857 |
<term>name</term> |
858 |
<listitem> |
859 |
<simpara>the path/identifier of the storage unit</simpara> |
860 |
</listitem> |
861 |
</varlistentry> |
862 |
<varlistentry> |
863 |
<term>size</term> |
864 |
<listitem> |
865 |
<simpara> |
866 |
total size of the unit; for the file type see a note below |
867 |
</simpara> |
868 |
</listitem> |
869 |
</varlistentry> |
870 |
<varlistentry> |
871 |
<term>used</term> |
872 |
<listitem> |
873 |
<simpara> |
874 |
used space in the unit; for the file type see a note below |
875 |
</simpara> |
876 |
</listitem> |
877 |
</varlistentry> |
878 |
<varlistentry> |
879 |
<term>free</term> |
880 |
<listitem> |
881 |
<simpara> |
882 |
available disk space |
883 |
</simpara> |
884 |
</listitem> |
885 |
</varlistentry> |
886 |
<varlistentry> |
887 |
<term>allocatable</term> |
888 |
<listitem> |
889 |
<simpara> |
890 |
whether we the unit is available for allocation |
891 |
(only <literal>lvm-pv</literal> can change this |
892 |
setting, the other types always report true) |
893 |
</simpara> |
894 |
</listitem> |
895 |
</varlistentry> |
896 |
</variablelist> |
897 |
</para> |
898 |
|
899 |
<para> |
900 |
Note that for the <quote>file</quote> type, the total disk |
901 |
space might not equal to the sum of used and free, due to the |
902 |
method Ganeti uses to compute each of them. The total and free |
903 |
values are computed as the total and free space values for the |
904 |
filesystem to which the directory belongs, but the used space |
905 |
is computed from the used space under that directory |
906 |
<emphasis>only</emphasis>, which might not be necessarily the |
907 |
root of the filesystem, and as such there could be files |
908 |
outside the file storage directory using disk space and |
909 |
causing a mismatch in the values. |
910 |
</para> |
911 |
|
912 |
<para> |
913 |
Example: |
914 |
<screen> |
915 |
node1# gnt-node list-storage node2 |
916 |
Node Type Name Size Used Free Allocatable |
917 |
node2 lvm-pv /dev/sda7 673.8G 1.5G 672.3G Y |
918 |
node2 lvm-pv /dev/sdb1 698.6G 0M 698.6G Y |
919 |
</screen> |
920 |
</para> |
921 |
</refsect2> |
922 |
|
923 |
<refsect2> |
924 |
<title>MODIFY-STORAGE</title> |
925 |
|
926 |
<cmdsynopsis> |
927 |
<command>modify-storage</command> |
928 |
<arg><option>--allocatable=yes|no</option></arg> |
929 |
<sbr> |
930 |
<arg choice="req"><replaceable>node</replaceable></arg> |
931 |
<arg choice="req"><replaceable>storage-type</replaceable></arg> |
932 |
<arg choice="req"><replaceable>volume-name</replaceable></arg> |
933 |
</cmdsynopsis> |
934 |
|
935 |
<para> |
936 |
Modifies storage volumes on a node. Only LVM physical volumes |
937 |
can be modified at the moment. They have a storage type |
938 |
of <quote>lvm-pv</quote>. |
939 |
</para> |
940 |
|
941 |
<para> |
942 |
Example: |
943 |
<screen> |
944 |
# gnt-node modify-storage --allocatable no node5.example.com lvm-pv /dev/sdb1 |
945 |
</screen> |
946 |
</para> |
947 |
</refsect2> |
948 |
|
949 |
<refsect2> |
950 |
<title>REPAIR-STORAGE</title> |
951 |
|
952 |
<cmdsynopsis> |
953 |
<command>repair-storage</command> |
954 |
<arg>--ignore-consistency</arg> |
955 |
<arg choice="req"><replaceable>node</replaceable></arg> |
956 |
<arg choice="req"><replaceable>storage-type</replaceable></arg> |
957 |
<arg choice="req"><replaceable>volume-name</replaceable></arg> |
958 |
</cmdsynopsis> |
959 |
|
960 |
<para> |
961 |
Repairs a storage volume on a node. Only LVM volume groups can |
962 |
be repaired at this time. They have the storage type |
963 |
<quote>lvm-vg</quote>. |
964 |
</para> |
965 |
|
966 |
<para> |
967 |
On LVM volume groups, <command>repair-storage</command> runs |
968 |
<quote>vgreduce --removemissing</quote>. |
969 |
</para> |
970 |
|
971 |
<caution> |
972 |
<para> |
973 |
Running this command can lead to data loss. Use it with care. |
974 |
</para> |
975 |
</caution> |
976 |
|
977 |
<para> |
978 |
The <option>--ignore-consistency</option> option will ignore |
979 |
any inconsistent disks (on the nodes paired with this |
980 |
one). Use of this option is most likely to lead to data-loss. |
981 |
</para> |
982 |
|
983 |
<para> |
984 |
Example: |
985 |
<screen> |
986 |
# gnt-node repair-storage node5.example.com lvm-vg xenvg |
987 |
</screen> |
988 |
</para> |
989 |
</refsect2> |
990 |
|
991 |
<refsect2> |
992 |
<title>POWERCYCLE</title> |
993 |
|
994 |
<cmdsynopsis> |
995 |
<command>powercycle</command> |
996 |
<arg><option>--yes</option></arg> |
997 |
<arg><option>--force</option></arg> |
998 |
<arg choice="req"><replaceable>node</replaceable></arg> |
999 |
</cmdsynopsis> |
1000 |
|
1001 |
<para> |
1002 |
This commands (tries to) forcefully reboot a node. It is a |
1003 |
command that can be used if the node environemnt is broken, |
1004 |
such that the admin can no longer login over ssh, but the |
1005 |
Ganeti node daemon is still working. |
1006 |
</para> |
1007 |
|
1008 |
<para> |
1009 |
Note that this command is not guaranteed to work; it depends |
1010 |
on the hypervisor how effective is the reboot attempt. For |
1011 |
Linux, this command require that the kernel option |
1012 |
<literal>CONFIG_MAGIC_SYSRQ</literal> is enabled. |
1013 |
</para> |
1014 |
|
1015 |
<para> |
1016 |
The <option>--yes</option> option can be used to skip |
1017 |
confirmation, while the <option>--force</option> option is |
1018 |
needed if the target node is the master node. |
1019 |
</para> |
1020 |
|
1021 |
</refsect1> |
1022 |
|
1023 |
&footer; |
1024 |
|
1025 |
</refentry> |
1026 |
|
1027 |
<!-- Keep this comment at the end of the file |
1028 |
Local variables: |
1029 |
mode: sgml |
1030 |
sgml-omittag:t |
1031 |
sgml-shorttag:t |
1032 |
sgml-minimize-attributes:nil |
1033 |
sgml-always-quote-attributes:t |
1034 |
sgml-indent-step:2 |
1035 |
sgml-indent-data:t |
1036 |
sgml-parent-document:nil |
1037 |
sgml-default-dtd-file:nil |
1038 |
sgml-exposed-tags:nil |
1039 |
sgml-local-catalogs:nil |
1040 |
sgml-local-ecat-files:nil |
1041 |
End: |
1042 |
--> |