ONNODE(1)																 ONNODE(1)

NAME

       onnode - run commands on ctdb nodes

SYNOPSIS

       onnode [OPTION] ... NODES COMMAND ...

DESCRIPTION

       onnode is a utility to run commands on a specific node of a CTDB cluster, or on all nodes.

       The NODES option specifies which node to run a command on. You can specify a numeric node number (from 0 to N-1) or a descriptive node
       specification (see DESCRIPTIVE NODE SPECIFICATIONS below). 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.

       The COMMAND can be any shell command. The onnode utility uses ssh or rsh to connect to the remote nodes and run the command.

DESCRIPTIVE NODE SPECIFICATIONS

       The following descriptive node specification can be used in place of numeric node numbers:

       all
	   All nodes.

       any
	   A node where ctdbd is running. This semi-random but there is a bias towards choosing a low numbered node.

       ok | healthy
	   All nodes that are not disconnected, banned, disabled or unhealthy.

       con | connected
	   All nodes that are not disconnected.

       lvs | lvsmaster
	   The current LVS master.

       natgw | natgwlist
	   The current NAT gateway.

       rm | recmaster
	   The current recovery master.

OPTIONS

       -c
	   Execute COMMAND in the current working directory on the specified nodes.

       -o <prefix>
	   Causes standard output from each node to be saved into a file with name <prefix>.<ip>.

       -p
	   Run COMMAND in parallel on the specified nodes. The default is to run COMMAND sequentially on each node.

       -q
	   Do not print node addresses. Normally, onnode prints informational node addresses if more than one node is specified. This overrides
	   -v.

       -n
	   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 -f /dev/null.

       -f <file>
	   Specify an alternative nodes file to use instead of the default. This option overrides the CTDB_NODES_FILE environment variable. See
	   the discussion of /etc/ctdb/nodes in the FILES section for more details.

       -v
	   Print a node addresses even if only one node is specified. Normally, onnode prints informational node addresses when more than one node
	   is specified.

       -h, --help
	   Show a short usage guide.

EXAMPLES

       The following command would show the process ID of ctdb on all nodes

		 onnode all pidof ctdbd

       The following command would show the last 5 lines of log on each node, preceded by the node's hostname

		 onnode all "hostname; tail -5 /var/log/log.ctdb"

       The following command would restart the ctdb service on all nodes.

		 onnode all service ctdb restart

       The following command would run ./foo in the current working directory, in parallel, on nodes 0, 2, 3 and 4.

		 onnode -c -p 0,2-4 ./foo

ENVIRONMENT

       CTDB_NODES_FILE
	   Name of alternative nodes file to use instead of the default. See the discussion of /etc/ctdb/nodes in the FILES section for more
	   details.

FILES

       /etc/ctdb/nodes
	   Default file containing a list of each node's IP address or hostname.

	   Actually, the default is $CTDB_BASE/nodes, where $CTDB_BASE defaults to /etc/ctdb. If a relative path is given (via the -f option or
	   $CTDB_BASE) and no corresponding file exists relative to the current directory then the file is also searched for in the $CTDB_BASE
	   directory.

       /etc/ctdb/onnode.conf
	   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.

SEE ALSO

       ctdbd(1), ctdb(1), http://ctdb.samba.org/

COPYRIGHT
/LICENSE
	   Copyright (C) Andrew Tridgell 2007
	   Copyright (C) Ronnie sahlberg 2007
	   Copyright (C) Martin Schwenke 2008

	   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.

	   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.

	   You should have received a copy of the GNU General Public License
	   along with this program; if not, see http://www.gnu.org/licenses/.

								    02/05/2010								 ONNODE(1)