1ONNODE(1) CTDB - clustered TDB database ONNODE(1)
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6 onnode - run commands on CTDB cluster nodes
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9 onnode [OPTION...] {NODES} {COMMAND}
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12 onnode is a utility to run commands on a specific node of a CTDB
13 cluster, or on all nodes.
14 NODES specifies which node(s) to run a command on. See section NODES
16 SPECIFICATION for details.
17 COMMAND can be any shell command. The onnode utility uses ssh or rsh to
19 connect to the remote nodes and run the command.
20
22 -c
23 Execute COMMAND in the current working directory on the specified
24 nodes.
25 -f FILENAME
27 Specify an alternative nodes FILENAME to use instead of the
28 default. This option overrides the CTDB_NODES_FILE and CTDB_NODES
29 variables. See the discussion of /etc/ctdb/nodes in the FILES
30 section for more details.
31 -i
33 Keep standard input open, allowing data to be piped to onnode.
34 Normally onnode closes stdin to avoid surprises when scripting.
35 Note that this option is ignored when using -p or if SSH is set to
36 anything other than "ssh".
37 -n
39 Allow nodes to be specified by name rather than node numbers. These
40 nodes don't need to be listed in the nodes file. You can avoid the
41 nodes file entirely by combining this with -f /dev/null.
42 -o PREFIX
44 Causes standard output from each node to be saved into a file with
45 name PREFIX.IP.
46 -p
48 Run COMMAND in parallel on the specified nodes. The default is to
49 run COMMAND sequentially on each node.
50 -P
52 Push files to nodes. Names of files to push are specified rather
53 than the usual command. Quoting is fragile/broken - filenames with
54 whitespace in them are not supported.
55 -q
57 Do not print node addresses. Normally, onnode prints informational
58 node addresses if more than one node is specified. This overrides
59 -v.
60 -v
62 Print node addresses even if only one node is specified. Normally,
63 onnode prints informational node addresses when more than one node
64 is specified.
65 -h, --help
67 Show a short usage guide.
68
70 Nodes can be specified via numeric node numbers (from 0 to N-1) or
71 mnemonics. Multiple nodes are specified using lists of nodes, separated
72 by commas, and ranges of numeric node numbers, separated by dashes. If
73 nodes are specified multiple times then the command will be executed
74 multiple times on those nodes. The order of nodes is significant.
75 The following mnemonics are available:
77 all
79 All nodes.
80 any
82 A node where ctdbd is running. This semi-random but there is a bias
83 towards choosing a low numbered node.
84 ok | healthy
86 All nodes that are not disconnected, banned, disabled or unhealthy.
87 con | connected
89 All nodes that are not disconnected.
90
92 The following command would show the process ID of ctdbd on all nodes
93 onnode all ctdb getpid
95 The following command would show the last 5 lines of log on each node,
98 preceded by the node's hostname
99 onnode all "hostname; tail -5 /var/log/log.ctdb"
101 The following command would restart the ctdb service on all nodes, in
104 parallel.
105 onnode -p all service ctdb restart
107 The following command would run ./foo in the current working directory,
110 in parallel, on nodes 0, 2, 3 and 4.
111 onnode -c -p 0,2-4 ./foo
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116 CTDB_BASE
117 Directory containing CTDB configuration files. The default is
118 /etc/ctdb.
119 CTDB_NODES_FILE
121 Name of alternative nodes file to use instead of the default. See
122 the FILES section for more details.
123
125 /etc/ctdb/nodes
126 Default file containing a list of each node's IP address or
127 hostname.
128 As above, a file specified via the -f or CTDB_NODES_FILE is given
130 precedence. If a relative path is specified and no corresponding
131 file exists relative to the current directory then the file is also
132 searched for in the $CTDB_BASE directory.
133 If CTDB_NODES_FILE is not set and CTDB_NODES is set in
135 configuration then the file pointed to by CTDB_NODES is used.
136 Otherwise the default is $CTDB_BASE/nodes, where CTDB_BASE defaults
138 to /etc/ctdb.
139 /etc/ctdb/onnode.conf
141 If this file exists it is sourced by onnode. The main purpose is to
142 allow the administrator to set SSH to something other than "ssh".
143 In this case the -t option is ignored. For example, the
144 administrator may choose to use use rsh instead of ssh.
145
147 ctdb(7), http://ctdb.samba.org/
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150 This documentation was written by Andrew Tridgell, Martin Schwenke
151
153 Copyright © 2007 Andrew Tridgell, Ronnie Sahlberg
154 Copyright © 2008 Martin Schwenke
155 This program is free software; you can redistribute it and/or modify it
157 under the terms of the GNU General Public License as published by the
158 Free Software Foundation; either version 3 of the License, or (at your
159 option) any later version.
160 This program is distributed in the hope that it will be useful, but
162 WITHOUT ANY WARRANTY; without even the implied warranty of
163 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
164 General Public License for more details.
165 You should have received a copy of the GNU General Public License along
167 with this program; if not, see http://www.gnu.org/licenses.
168ctdb 10/30/2018 ONNODE(1)