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onnode: run commands on ctdb nodes


onnode - run commands on ctdb nodes


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


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.
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.
-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 /etc/ctdb/nodes. This overrides the CTDB_NODES_FILE environment variable. -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.


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


CTDB_NODES_FILE Name of alternative nodes file to use instead of /etc/ctdb/nodes.


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


ctdbd(1), ctdb(1), //ctdb.samba.org/
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 //www.gnu.org/licenses/. 12/08/2009 ONNODE(1)

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