1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="onnode.1">
<refmeta>
<refentrytitle>onnode</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>onnode</refname>
<refpurpose>run commands on ctdb nodes</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>onnode [OPTION] ... NODES COMMAND ...</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1><title>DESCRIPTION</title>
<para>
onnode is a utility to run commands on a specific node of a CTDB
cluster, or on all nodes.
</para>
<para>
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.
</para>
<para>
The COMMAND can be any shell command. The onnode utility uses
ssh or rsh to connect to the remote nodes and run the command.
</para>
</refsect1>
<refsect1><title>DESCRIPTIVE NODE SPECIFICATIONS</title>
<para>
The following descriptive node specification can be used in
place of numeric node numbers:
</para>
<variablelist>
<varlistentry><term>all</term>
<listitem>
<para>
All nodes.
</para>
</listitem>
</varlistentry>
<varlistentry><term>any</term>
<listitem>
<para>
A node where ctdbd is running. This semi-random but
there is a bias towards choosing a low numbered node.
</para>
</listitem>
</varlistentry>
<varlistentry><term>ok | healthy</term>
<listitem>
<para>
All nodes that are not disconnected, banned, disabled or
unhealthy.
</para>
</listitem>
</varlistentry>
<varlistentry><term>con | connected</term>
<listitem>
<para>
All nodes that are not disconnected.
</para>
</listitem>
</varlistentry>
<varlistentry><term>lvs | lvsmaster</term>
<listitem>
<para>
The current LVS master.
</para>
</listitem>
</varlistentry>
<varlistentry><term>natgw | natgwlist</term>
<listitem>
<para>
The current NAT gateway.
</para>
</listitem>
</varlistentry>
<varlistentry><term>rm | recmaster</term>
<listitem>
<para>
The current recovery master.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1><title>OPTIONS</title>
<variablelist>
<varlistentry><term>-c</term>
<listitem>
<para>
Execute COMMAND in the current working directory on the
specified nodes.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-o <prefix></term>
<listitem>
<para>
Causes standard output from each node to be saved into a
file with name <prefix>.<ip>.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-p</term>
<listitem>
<para>
Run COMMAND in parallel on the specified nodes. The
default is to run COMMAND sequentially on each node.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-q</term>
<listitem>
<para>
Do not print node addresses. Normally, onnode prints
informational node addresses if more than one node is
specified. This overrides -v.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-v</term>
<listitem>
<para>
Print a node addresses even if only one node is specified.
Normally, onnode prints informational node addresses when
more than one node is specified.
</para>
</listitem>
</varlistentry>
<varlistentry><term>-h, --help</term>
<listitem>
<para>
Show a short usage guide.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1><title>EXAMPLES</title>
<para>
The following command would show the process ID of ctdb on all nodes
</para>
<screen format="linespecific">
onnode all pidof ctdbd
</screen>
<para>
The following command would show the last 5 lines of log on each
node, preceded by the node's hostname
</para>
<screen format="linespecific">
onnode all "hostname; tail -5 /var/log/log.ctdb"
</screen>
<para>
The following command would restart the ctdb service on all nodes.
</para>
<screen format="linespecific">
onnode all service ctdb restart
</screen>
<para>
The following command would run ./foo in the current working
directory, in parallel, on nodes 0, 2, 3 and 4.
</para>
<screen format="linespecific">
onnode -c -p 0,2-4 ./foo
</screen>
</refsect1>
<refsect1><title>ENVIRONMENT</title>
<variablelist>
<varlistentry><term><envar>CTDB_NODES_FILE</envar></term>
<listitem>
<para>
Name of alternative nodes file to use instead of
<filename>/etc/ctdb/nodes</filename>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1><title>FILES</title>
<variablelist>
<varlistentry><term><filename>/etc/ctdb/nodes</filename></term>
<listitem>
<para>
Default file containing a list of each node's IP address
or hostname.
</para>
</listitem>
</varlistentry>
<varlistentry><term><filename>/etc/ctdb/onnode.conf</filename></term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1><title>SEE ALSO</title>
<para>
ctdbd(1), ctdb(1), <ulink url="http://ctdb.samba.org/"/>
</para>
</refsect1>
<refsect1><title>COPYRIGHT/LICENSE</title>
<literallayout>
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/.
</literallayout>
</refsect1>
</refentry>
|
