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5 <refentry id="onnode.1">
8 <refentrytitle>onnode</refentrytitle>
9 <manvolnum>1</manvolnum>
10 <refmiscinfo class="source">ctdb</refmiscinfo>
11 <refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
15 <refname>onnode</refname>
16 <refpurpose>run commands on CTDB cluster nodes</refpurpose>
21 <command>onnode</command>
22 <arg rep="repeat"><replaceable>OPTION</replaceable></arg>
23 <arg choice="req"><replaceable>NODES</replaceable></arg>
24 <arg choice="req"><replaceable>COMMAND</replaceable></arg>
29 <title>DESCRIPTION</title>
31 onnode is a utility to run commands on a specific node of a CTDB
32 cluster, or on all nodes.
35 <replaceable>NODES</replaceable> specifies which node(s) to run
36 a command on. See section <citetitle>NODES
37 SPECIFICATION</citetitle> for details.
40 <replaceable>COMMAND</replaceable> can be any shell command. The
41 onnode utility uses ssh or rsh to connect to the remote nodes
47 <title>OPTIONS</title>
50 <varlistentry><term>-c</term>
53 Execute COMMAND in the current working directory on the
59 <varlistentry><term>-f <parameter>FILENAME</parameter></term>
62 Specify an alternative nodes FILENAME to use instead of
63 the default. This option overrides the CTDB_NODES_FILE
64 environment variable. See the discussion of
65 <filename>/etc/ctdb/nodes</filename> in the FILES section
71 <varlistentry><term>-i</term>
74 Keep standard input open, allowing data to be piped to
75 onnode. Normally onnode closes stdin to avoid surprises
76 when scripting. Note that this option is ignored when
77 using <option>-p</option> or if <envar>SSH</envar> is set
78 to anything other than "ssh".
83 <varlistentry><term>-n</term>
86 Allow nodes to be specified by name rather than node
87 numbers. These nodes don't need to be listed in the nodes
88 file. You can avoid the nodes file entirely by combining
89 this with <code>-f /dev/null</code>.
94 <varlistentry><term>-o <parameter>PREFIX</parameter></term>
97 Causes standard output from each node to be saved into a
98 file with name PREFIX.<replaceable>IP</replaceable>.
103 <varlistentry><term>-p</term>
106 Run COMMAND in parallel on the specified nodes. The
107 default is to run COMMAND sequentially on each node.
112 <varlistentry><term>-P</term>
115 Push files to nodes. Names of files to push are specified
116 rather than the usual command. Quoting is fragile/broken
117 - filenames with whitespace in them are not supported.
122 <varlistentry><term>-q</term>
125 Do not print node addresses. Normally, onnode prints
126 informational node addresses if more than one node is
127 specified. This overrides -v.
132 <varlistentry><term>-v</term>
135 Print node addresses even if only one node is specified.
136 Normally, onnode prints informational node addresses when
137 more than one node is specified.
142 <varlistentry><term>-h, --help</term>
145 Show a short usage guide.
153 <title>NODES SPECIFICATION</title>
156 Nodes can be specified via numeric node numbers (from 0 to N-1)
157 or mnemonics. Multiple nodes are specified using lists of
158 nodes, separated by commas, and ranges of numeric node numbers,
159 separated by dashes. If nodes are specified multiple times then
160 the command will be executed multiple times on those nodes. The
161 order of nodes is significant.
165 The following mnemonics are available:
169 <varlistentry><term>all</term>
176 <varlistentry><term>any</term>
179 A node where ctdbd is running. This semi-random but
180 there is a bias towards choosing a low numbered node.
184 <varlistentry><term>ok | healthy</term>
187 All nodes that are not disconnected, banned, disabled or
192 <varlistentry><term>con | connected</term>
195 All nodes that are not disconnected.
199 <varlistentry><term>lvs | lvsmaster</term>
202 The current LVS master.
206 <varlistentry><term>natgw | natgwlist</term>
209 The current NAT gateway.
213 <varlistentry><term>rm | recmaster</term>
216 The current recovery master.
224 <title>EXAMPLES</title>
227 The following command would show the process ID of ctdbd on all nodes
229 <screen format="linespecific">
230 onnode all ctdb getpid
234 The following command would show the last 5 lines of log on each
235 node, preceded by the node's hostname
237 <screen format="linespecific">
238 onnode all "hostname; tail -5 /var/log/log.ctdb"
242 The following command would restart the ctdb service on all
245 <screen format="linespecific">
246 onnode -p all service ctdb restart
250 The following command would run ./foo in the current working
251 directory, in parallel, on nodes 0, 2, 3 and 4.
253 <screen format="linespecific">
254 onnode -c -p 0,2-4 ./foo
259 <title>ENVIRONMENT</title>
262 <varlistentry><term><envar>CTDB_BASE</envar></term>
265 Directory containing CTDB configuration files. The
266 default is <filename>/etc/ctdb</filename>.
271 <varlistentry><term><envar>CTDB_NODES_FILE</envar></term>
274 Name of alternative nodes file to use instead of the
275 default. See the <citetitle>FILES</citetitle> section for
288 <varlistentry><term><filename>/etc/ctdb/nodes</filename></term>
291 Default file containing a list of each node's IP address
295 Actually, the default is
296 <filename>$CTDB_BASE/nodes</filename>, where
297 <envar>CTDB_BASE</envar> defaults to
298 <filename>/etc/ctdb</filename>. If a relative path is
299 given (via the -f option or <envar>CTDB_BASE</envar>) and
300 no corresponding file exists relative to the current
301 directory then the file is also searched for in the
302 <filename>$CTDB_BASE</filename> directory.
307 <varlistentry><term><filename>/etc/ctdb/onnode.conf</filename></term>
310 If this file exists it is sourced by onnode. The main
311 purpose is to allow the administrator to set
312 <envar>SSH</envar> to something other than "ssh". In this
313 case the -t option is ignored. For example, the
314 administrator may choose to use use rsh instead of ssh.
322 <title>SEE ALSO</title>
325 <citerefentry><refentrytitle>ctdb</refentrytitle>
326 <manvolnum>7</manvolnum></citerefentry>,
328 <ulink url="http://ctdb.samba.org/"/>
335 This documentation was written by
343 <holder>Andrew Tridgell</holder>
344 <holder>Ronnie Sahlberg</holder>
348 <holder>Martin Schwenke</holder>
352 This program is free software; you can redistribute it and/or
353 modify it under the terms of the GNU General Public License as
354 published by the Free Software Foundation; either version 3 of
355 the License, or (at your option) any later version.
358 This program is distributed in the hope that it will be
359 useful, but WITHOUT ANY WARRANTY; without even the implied
360 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
361 PURPOSE. See the GNU General Public License for more details.
364 You should have received a copy of the GNU General Public
365 License along with this program; if not, see
366 <ulink url="http://www.gnu.org/licenses"/>.