Provided by: ctdb_1.11+git20111102-2_amd64 bug

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)