onnode man page on Oracle
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ONNODE(1) CTDB - clustered TDB database ONNODE(1)
NAME
onnode - run commands on CTDB cluster 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.
NODES specifies which node(s) to run a command on. See section NODES
SPECIFICATION for details.
COMMAND can be any shell command. The onnode utility uses ssh or rsh to
connect to the remote nodes and run the command.
OPTIONS
-c
Execute COMMAND in the current working directory on the specified
nodes.
-f FILENAME
Specify an alternative nodes FILENAME 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.
-i
Keep standard input open, allowing data to be piped to onnode.
Normally onnode closes stdin to avoid surprises when scripting.
Note that this option is ignored when using -p or if SSH is set to
anything other than "ssh".
-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.
-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.
-P
Push files to nodes. Names of files to push are specified rather
than the usual command. Quoting is fragile/broken - filenames with
whitespace in them are not supported.
-q
Do not print node addresses. Normally, onnode prints informational
node addresses if more than one node is specified. This overrides
-v.
-v
Print 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.
NODES SPECIFICATION
Nodes can be specified via numeric node numbers (from 0 to N-1) or
mnemonics. Multiple nodes are specified using 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 following mnemonics are available:
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.
EXAMPLES
The following command would show the process ID of ctdbd on all nodes
onnode all ctdb getpid
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, in
parallel.
onnode -p 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_BASE
Directory containing CTDB configuration files. The default is
/etc/ctdb.
CTDB_NODES_FILE
Name of alternative nodes file to use instead of the default. See
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
ctdb(7), http://ctdb.samba.org/
AUTHOR
This documentation was written by Andrew Tridgell, Martin Schwenke
COPYRIGHT
Copyright © 2007 Andrew Tridgell, Ronnie Sahlberg
Copyright © 2008 Martin Schwenke
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.
ctdb 11/27/2013 ONNODE(1)
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