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< html > < head > < meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" > < title > onnode< / title > < meta name = "generator" content = "DocBook XSL Stylesheets V1.74.0" > < / head > < body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" > < div class = "refentry" lang = "en" > < a name = "onnode.1" > < / a > < div class = "titlepage" > < / div > < div class = "refnamediv" > < h2 > Name< / h2 > < p > onnode — run commands on ctdb nodes< / p > < / div > < div class = "refsynopsisdiv" > < h2 > Synopsis< / h2 > < div class = "cmdsynopsis" > < p > < code class = "command" > onnode [OPTION] ... NODES COMMAND ...< / code > < / p > < / div > < / div > < div class = "refsect1" lang = "en" > < a name = "id2507976" > < / a > < h2 > DESCRIPTION< / h2 > < p >
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onnode is a utility to run commands on a specific node of a CTDB
cluster, or on all nodes.
< / p > < p >
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The NODES option specifies which node to run a command on. You
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can specify a numeric node number (from 0 to N-1) or the special
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node 'all'. You can also specify 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.
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< / p > < p >
The COMMAND can be any shell command. The onnode utility uses
ssh or rsh to connect to the remote nodes and run the command.
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< / p > < / div > < div class = "refsect1" lang = "en" > < a name = "id2508002" > < / a > < h2 > OPTIONS< / h2 > < div class = "variablelist" > < dl > < dt > < span class = "term" > -c< / span > < / dt > < dd > < p >
Execute COMMAND in the current working directory on each
node.
< / p > < / dd > < dt > < span class = "term" > -p< / span > < / dt > < dd > < p >
Run commands in parallel on the specified nodes. In this
mode
< / p > < / dd > < dt > < span class = "term" > -q< / span > < / dt > < dd > < p >
Do not print node addresses. Normally, onnode prints
informational node addresses if more than one node is
specified. This overrides -v.
< / p > < / dd > < dt > < span class = "term" > -v< / span > < / dt > < dd > < p >
Print a node addresses even if only one node is specified.
Normally, onnode prints informational node addresses when
more than one node is specified.
< / p > < / dd > < dt > < span class = "term" > -h, --help< / span > < / dt > < dd > < p >
Show a short usage guide.
< / p > < / dd > < / dl > < / div > < / div > < div class = "refsect1" lang = "en" > < a name = "id2511603" > < / a > < h2 > EXAMPLES< / h2 > < p >
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The following command would show the process ID of ctdb on all nodes
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< / p > < pre class = "screen" >
onnode all pidof ctdbd
< / pre > < p >
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The following command would show the last 5 lines of log on each
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node, preceded by the node's hostname
< / p > < pre class = "screen" >
onnode all "hostname; tail -5 /var/log/log.ctdb"
< / pre > < p >
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The following command would restart the ctdb service on all nodes.
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< / p > < pre class = "screen" >
onnode all service ctdb restart
< / pre > < p >
The following command would run ./foo in the current working
directory, in parallel, on nodes 0, 2, 3 and 4.
< / p > < pre class = "screen" >
onnode -c -p 0,2-4 ./foo
< / pre > < / div > < div class = "refsect1" lang = "en" > < a name = "id2511652" > < / a > < h2 > FILES< / h2 > < div class = "variablelist" > < dl > < dt > < span class = "term" > /etc/ctdb/nodes< / span > < / dt > < dd > < p >
Contains a list of each node's IP address or hostname.
< / p > < / dd > < dt > < span class = "term" > /etc/ctdb/onnode.conf< / span > < / dt > < dd > < p >
If this file exists it is sourced by onnode. The main
purpose is to allow the administrator to set $SSH to
something other than "ssh". In this case the -t option is
ignored. For example, the administrator may choose to use
use rsh instead of ssh.
< / p > < / dd > < / dl > < / div > < / div > < div class = "refsect1" lang = "en" > < a name = "id2511691" > < / a > < h2 > SEE ALSO< / h2 > < p >
ctdbd(1), ctdb(1), < a class = "ulink" href = "http://ctdb.samba.org/" target = "_top" > http://ctdb.samba.org/< / a >
< / p > < / div > < div class = "refsect1" lang = "en" > < a name = "id2511704" > < / a > < h2 > COPYRIGHT/LICENSE< / h2 > < div class = "literallayout" > < p > < br >
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Copyright<EFBFBD> (C)<29> Andrew<65> Tridgell<6C> 2007< br >
Copyright<EFBFBD> (C)<29> Ronnie<69> sahlberg<72> 2007< br >
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Copyright<EFBFBD> (C)<29> Martin<69> Schwenke<6B> 2008< br >
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< br >
This<EFBFBD> program<EFBFBD> is<EFBFBD> free<EFBFBD> software;<3B> you<6F> can<61> redistribute<74> it<69> and/or<6F> modify< br >
it<EFBFBD> under<EFBFBD> the<EFBFBD> terms<EFBFBD> of<EFBFBD> the<EFBFBD> GNU<EFBFBD> General<EFBFBD> Public<EFBFBD> License<EFBFBD> as<EFBFBD> published<EFBFBD> by< br >
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the<EFBFBD> Free<EFBFBD> Software<EFBFBD> Foundation;<3B> either<65> version<6F> 3<EFBFBD> of<6F> the<68> License,<2C> or<6F> (at< br >
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your<EFBFBD> option)<29> any<6E> later<65> version.< br >
< br >
This<EFBFBD> program<EFBFBD> is<EFBFBD> distributed<EFBFBD> in<EFBFBD> the<EFBFBD> hope<EFBFBD> that<EFBFBD> it<EFBFBD> will<EFBFBD> be<EFBFBD> useful,<2C> but< br >
WITHOUT<EFBFBD> ANY<EFBFBD> WARRANTY;<3B> without<75> even<65> the<68> implied<65> warranty<74> of< br >
MERCHANTABILITY<EFBFBD> or<EFBFBD> FITNESS<EFBFBD> FOR<EFBFBD> A<EFBFBD> PARTICULAR<EFBFBD> PURPOSE.<2E> <> See<65> the<68> GNU< br >
General<EFBFBD> Public<EFBFBD> License<EFBFBD> for<EFBFBD> more<EFBFBD> details.< br >
< br >
You<EFBFBD> should<EFBFBD> have<EFBFBD> received<EFBFBD> a<EFBFBD> copy<EFBFBD> of<EFBFBD> the<EFBFBD> GNU<EFBFBD> General<EFBFBD> Public<EFBFBD> License< br >
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along<EFBFBD> with<EFBFBD> this<EFBFBD> program;<3B> if<69> not,<2C> see<65> http://www.gnu.org/licenses/.< br >
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