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}
10
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 environment
29 variable. 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 lvs | lvsmaster
92 The current LVS master.
93 natgw | natgwlist
95 The current NAT gateway.
96 rm | recmaster
98 The current recovery master.
99
101 The following command would show the process ID of ctdbd on all nodes
102 onnode all ctdb getpid
104 The following command would show the last 5 lines of log on each node,
107 preceded by the node's hostname
108 onnode all "hostname; tail -5 /var/log/log.ctdb"
110 The following command would restart the ctdb service on all nodes, in
113 parallel.
114 onnode -p all service ctdb restart
116 The following command would run ./foo in the current working directory,
119 in parallel, on nodes 0, 2, 3 and 4.
120 onnode -c -p 0,2-4 ./foo
122
125 CTDB_BASE
126 Directory containing CTDB configuration files. The default is
127 /etc/ctdb.
128 CTDB_NODES_FILE
130 Name of alternative nodes file to use instead of the default. See
131 the FILES section for more details.
132
134 /etc/ctdb/nodes
135 Default file containing a list of each node's IP address or
136 hostname.
137 Actually, the default is $CTDB_BASE/nodes, where CTDB_BASE defaults
139 to /etc/ctdb. If a relative path is given (via the -f option or
140 CTDB_BASE) and no corresponding file exists relative to the current
141 directory then the file is also searched for in the $CTDB_BASE
142 directory.
143 /etc/ctdb/onnode.conf
145 If this file exists it is sourced by onnode. The main purpose is to
146 allow the administrator to set SSH to something other than "ssh".
147 In this case the -t option is ignored. For example, the
148 administrator may choose to use use rsh instead of ssh.
149
151 ctdb(7), http://ctdb.samba.org/
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154 This documentation was written by Andrew Tridgell, Martin Schwenke
155
157 Copyright © 2007 Andrew Tridgell, Ronnie Sahlberg
158 Copyright © 2008 Martin Schwenke
159 This program is free software; you can redistribute it and/or modify it
161 under the terms of the GNU General Public License as published by the
162 Free Software Foundation; either version 3 of the License, or (at your
163 option) any later version.
164 This program is distributed in the hope that it will be useful, but
166 WITHOUT ANY WARRANTY; without even the implied warranty of
167 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
168 General Public License for more details.
169 You should have received a copy of the GNU General Public License along
171 with this program; if not, see http://www.gnu.org/licenses.
172ctdb 11/27/2013 ONNODE(1)