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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry
PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<refentry id="onnode.1">
<refmeta>
<refentrytitle>onnode</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="source">ctdb</refmiscinfo>
<refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
</refmeta>
<refnamediv>
<refname>onnode</refname>
<refpurpose>run commands on CTDB cluster nodes</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>onnode</command>
<arg rep="repeat"><replaceable>OPTION</replaceable></arg>
<arg choice="req"><replaceable>NODES</replaceable></arg>
<arg choice="req"><replaceable>COMMAND</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>
onnode is a utility to run commands on a specific node of a CTDB
cluster, or on all nodes.
</para>
<para>
<replaceable>NODES</replaceable> specifies which node(s) to run
a command on. See section <citetitle>NODES
SPECIFICATION</citetitle> for details.
</para>
<para>
<replaceable>COMMAND</replaceable> can be any shell command. The
onnode utility uses ssh or rsh to connect to the remote nodes
and run the command.
</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry><term>-c</term>
<listitem>
<para>
Execute COMMAND in the current working directory on the
specified nodes.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-f <parameter>FILENAME</parameter></term>
<listitem>
<para>
Specify an alternative nodes FILENAME to use instead of
the default. See the discussion of
<filename>/usr/local/etc/ctdb/nodes</filename> in the
FILES section for more details.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-i</term>
<listitem>
<para>
Keep standard input open, allowing data to be piped to
onnode. Normally onnode closes stdin to avoid surprises
when scripting. Note that this option is ignored when
using <option>-p</option> or if <envar>ONNODE_SSH</envar>
is set to anything other than "ssh".
</para>
</listitem>
</varlistentry>
<varlistentry><term>-n</term>
<listitem>
<para>
Allow nodes to be specified by name rather than node
numbers. These nodes don't need to be listed in the nodes
file. You can avoid the nodes file entirely by combining
this with <code>-f /dev/null</code>.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-p</term>
<listitem>
<para>
Run COMMAND in parallel on the specified nodes. The
default is to run COMMAND sequentially on each node.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-P</term>
<listitem>
<para>
Push files to nodes. Names of files to push are specified
rather than the usual command. Quoting is fragile/broken
- filenames with whitespace in them are not supported.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-q</term>
<listitem>
<para>
Do not print node addresses. Normally, onnode prints
informational node addresses if more than one node is
specified. This overrides -v.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-v</term>
<listitem>
<para>
Print node addresses even if only one node is specified.
Normally, onnode prints informational node addresses when
more than one node is specified.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-h, --help</term>
<listitem>
<para>
Show a short usage guide.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>NODES SPECIFICATION</title>
<para>
Nodes can be specified via numeric node numbers (from 0 to N-1)
or mnemonics. Multiple nodes are specified using lists of
nodes, separated by commas, and ranges of numeric node numbers,
separated by dashes. If nodes are specified multiple times then
the command will be executed multiple times on those nodes. The
order of nodes is significant.
</para>
<para>
The following mnemonics are available:
</para>
<variablelist>
<varlistentry><term>all</term>
<listitem>
<para>
All nodes.
</para>
</listitem>
</varlistentry>
<varlistentry><term>any</term>
<listitem>
<para>
A node where ctdbd is running. This semi-random but
there is a bias towards choosing a low numbered node.
</para>
</listitem>
</varlistentry>
<varlistentry><term>ok | healthy</term>
<listitem>
<para>
All nodes that are not disconnected, banned, disabled or
unhealthy.
</para>
</listitem>
</varlistentry>
<varlistentry><term>con | connected</term>
<listitem>
<para>
All nodes that are not disconnected.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLES</title>
<para>
The following command would show the process ID of ctdbd on all nodes
</para>
<screen format="linespecific">
onnode all ctdb getpid
</screen>
<para>
The following command would show the last 5 lines of log on each
node, preceded by the node's hostname
</para>
<screen format="linespecific">
onnode all "hostname; tail -5 /usr/local/var/log/log.ctdb"
</screen>
<para>
The following command would restart the ctdb service on all
nodes, in parallel.
</para>
<screen format="linespecific">
onnode -p all service ctdb restart
</screen>
<para>
The following command would run ./foo in the current working
directory, in parallel, on nodes 0, 2, 3 and 4.
</para>
<screen format="linespecific">
onnode -c -p 0,2-4 ./foo
</screen>
</refsect1>
<refsect1>
<title>FILES</title>
<variablelist>
<varlistentry><term><filename>/usr/local/etc/ctdb/nodes</filename></term>
<listitem>
<para>
Default file containing a list of each node's IP address
or hostname.
</para>
<para>
As above, a file specified via the <option>-f</option>
is given precedence. If a
relative path is specified and no corresponding file
exists relative to the current directory then the file is
also searched for in the CTDB configuration directory.
</para>
<para>
Otherwise the default is
<filename>/usr/local/etc/ctdb/nodes</filename>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/usr/local/etc/ctdb/onnode.conf</filename></term>
<listitem>
<para>
If this file exists it is sourced by onnode. The main
purpose is to allow the administrator to set
<envar>ONNODE_SSH</envar> to something other than "ssh".
In this case the -t option is ignored.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>ctdb</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>,
<ulink url="http://ctdb.samba.org/"/>
</para>
</refsect1>
<refentryinfo>
<author>
<contrib>
This documentation was written by
Andrew Tridgell,
Martin Schwenke
</contrib>
</author>
<copyright>
<year>2007</year>
<holder>Andrew Tridgell</holder>
<holder>Ronnie Sahlberg</holder>
</copyright>
<copyright>
<year>2008</year>
<holder>Martin Schwenke</holder>
</copyright>
<legalnotice>
<para>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of
the License, or (at your option) any later version.
</para>
<para>
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
</para>
<para>
You should have received a copy of the GNU General Public
License along with this program; if not, see
<ulink url="http://www.gnu.org/licenses"/>.
</para>
</legalnotice>
</refentryinfo>
</refentry>
|
