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1 <?xml version="1.0" encoding="iso-8859-1"?>
2 <!DOCTYPE refentry
3 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
4 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
5 <refentry id="ctdb.1">
7 <refentryinfo>
8 <author>
9 <contrib>
10 This documentation was written by
11 Ronnie Sahlberg,
12 Amitay Isaacs,
13 Martin Schwenke
14 </contrib>
15 </author>
17 <copyright>
18 <year>2007</year>
19 <holder>Andrew Tridgell</holder>
20 <holder>Ronnie Sahlberg</holder>
21 </copyright>
22 <legalnotice>
23 <para>
24 This program is free software; you can redistribute it and/or
25 modify it under the terms of the GNU General Public License as
26 published by the Free Software Foundation; either version 3 of
27 the License, or (at your option) any later version.
28 </para>
29 <para>
30 This program is distributed in the hope that it will be
31 useful, but WITHOUT ANY WARRANTY; without even the implied
32 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
33 PURPOSE. See the GNU General Public License for more details.
34 </para>
35 <para>
36 You should have received a copy of the GNU General Public
37 License along with this program; if not, see
38 <ulink url="http://www.gnu.org/licenses"/>.
39 </para>
40 </legalnotice>
41 </refentryinfo>
43 <refmeta>
44 <refentrytitle>ctdb</refentrytitle>
45 <manvolnum>1</manvolnum>
46 <refmiscinfo class="source">ctdb</refmiscinfo>
47 <refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
48 </refmeta>
50 <refnamediv>
51 <refname>ctdb</refname>
52 <refpurpose>CTDB management utility</refpurpose>
53 </refnamediv>
55 <refsynopsisdiv>
56 <cmdsynopsis>
57 <command>ctdb</command>
58 <arg rep="repeat"><replaceable>OPTION</replaceable></arg>
59 <arg choice="req"><replaceable>COMMAND</replaceable></arg>
60 <arg choice="opt"><replaceable>COMMAND-ARGS</replaceable></arg>
61 </cmdsynopsis>
62 </refsynopsisdiv>
64 <refsect1>
65 <title>DESCRIPTION</title>
66 <para>
67 ctdb is a utility to view and manage a CTDB cluster.
68 </para>
70 <para>
71 The following terms are used when referring to nodes in a
72 cluster:
73 <variablelist>
74 <varlistentry>
75 <term>PNN</term>
76 <listitem>
77 <para>
78 Physical Node Number. The physical node number is an
79 integer that describes the node in the cluster. The
80 first node has physical node number 0. in a cluster.
81 </para>
82 </listitem>
83 </varlistentry>
84 <varlistentry>
85 <term>PNN-LIST</term>
86 <listitem>
87 <para>
88 This is either a single PNN, a comma-separate list of PNNs
89 or "all".
90 </para>
91 </listitem>
92 </varlistentry>
93 </variablelist>
94 </para>
96 <para>
97 Commands that reference a database use the following terms:
98 <variablelist>
99 <varlistentry>
100 <term>DB</term>
101 <listitem>
102 <para>
103 This is either a database name, such as
104 <filename>locking.tdb</filename> or a database ID such
105 as "0x42fe72c5".
106 </para>
107 </listitem>
108 </varlistentry>
109 <varlistentry>
110 <term>DB-LIST</term>
111 <listitem>
112 <para>
113 A space separated list of at least one
114 <parameter>DB</parameter>.
115 </para>
116 </listitem>
117 </varlistentry>
118 </variablelist>
119 </para>
120 </refsect1>
122 <refsect1>
123 <title>OPTIONS</title>
125 <variablelist>
126 <varlistentry><term>-n <parameter>PNN-LIST</parameter></term>
127 <listitem>
128 <para>
129 The nodes specified by PNN-LIST should be queried for the
130 requested information. Default is to query the daemon
131 running on the local host.
132 </para>
133 </listitem>
134 </varlistentry>
136 <varlistentry><term>-Y</term>
137 <listitem>
138 <para>
139 Produce output in machine readable form for easier parsing
140 by scripts. Not all commands support this option.
141 </para>
142 </listitem>
143 </varlistentry>
145 <varlistentry><term>-t <parameter>TIMEOUT</parameter></term>
146 <listitem>
147 <para>
148 Indicates that ctdb should wait up to TIMEOUT seconds for
149 a response to most commands sent to the CTDB daemon. The
150 default is 10 seconds.
151 </para>
152 </listitem>
153 </varlistentry>
155 <varlistentry><term>-T <parameter>TIMELIMIT</parameter></term>
156 <listitem>
157 <para>
158 Indicates that TIMELIMIT is the maximum run time (in
159 seconds) for the ctdb command. When TIMELIMIT is exceeded
160 the ctdb command will terminate with an error. The default
161 is 120 seconds.
162 </para>
163 </listitem>
164 </varlistentry>
166 <varlistentry><term>-? --help</term>
167 <listitem>
168 <para>
169 Print some help text to the screen.
170 </para>
171 </listitem>
172 </varlistentry>
174 <varlistentry><term>--usage</term>
175 <listitem>
176 <para>
177 Print useage information to the screen.
178 </para>
179 </listitem>
180 </varlistentry>
182 <varlistentry><term>-d --debug=<parameter>DEBUGLEVEL</parameter></term>
183 <listitem>
184 <para>
185 Change the debug level for the command. Default is ERR (0).
186 </para>
187 </listitem>
188 </varlistentry>
190 <varlistentry><term>--socket=<parameter>FILENAME</parameter></term>
191 <listitem>
192 <para>
193 Specify that FILENAME is the name of the Unix domain
194 socket to use when connecting to the local CTDB
195 daemon. The default is
196 <filename>/tmp/ctdb.socket</filename>.
197 </para>
198 </listitem>
199 </varlistentry>
200 </variablelist>
201 </refsect1>
204 <refsect1>
205 <title>ADMINISTRATIVE COMMANDS</title>
206 <para>
207 These are commands used to monitor and administer a CTDB cluster.
208 </para>
210 <refsect2>
211 <title>pnn</title>
212 <para>
213 This command displays the PNN of the current node.
214 </para>
215 </refsect2>
217 <refsect2>
218 <title>xpnn</title>
219 <para>
220 This command displays the PNN of the current node without
221 contacting the CTDB daemon. It parses the nodes file
222 directly, so can produce unexpected output if the nodes file
223 has been edited but has not been reloaded.
224 </para>
225 </refsect2>
227 <refsect2>
228 <title>status</title>
229 <para>
230 This command shows the current status of all CTDB nodes based
231 on information from the queried node.
232 </para>
234 <para>
235 Note: If the the queried node is INACTIVE then the status
236 might not be current.
237 </para>
239 <refsect3>
240 <title>Node status</title>
241 <para>
242 This includes the number of physical nodes and the status of
243 each node. See <citerefentry><refentrytitle>ctdb</refentrytitle>
244 <manvolnum>7</manvolnum></citerefentry> for information
245 about node states.
246 </para>
247 </refsect3>
249 <refsect3>
250 <title>Generation</title>
251 <para>
252 The generation id is a number that indicates the current generation
253 of a cluster instance. Each time a cluster goes through a
254 reconfiguration or a recovery its generation id will be changed.
255 </para>
256 <para>
257 This number does not have any particular meaning other than
258 to keep track of when a cluster has gone through a
259 recovery. It is a random number that represents the current
260 instance of a ctdb cluster and its databases. The CTDB
261 daemon uses this number internally to be able to tell when
262 commands to operate on the cluster and the databases was
263 issued in a different generation of the cluster, to ensure
264 that commands that operate on the databases will not survive
265 across a cluster database recovery. After a recovery, all
266 old outstanding commands will automatically become invalid.
267 </para>
268 <para>
269 Sometimes this number will be shown as "INVALID". This only means that
270 the ctdbd daemon has started but it has not yet merged with the cluster through a recovery.
271 All nodes start with generation "INVALID" and are not assigned a real
272 generation id until they have successfully been merged with a cluster
273 through a recovery.
274 </para>
275 </refsect3>
277 <refsect3>
278 <title>Virtual Node Number (VNN) map</title>
279 <para>
280 Consists of the number of virtual nodes and mapping from
281 virtual node numbers to physical node numbers. Virtual
282 nodes host CTDB databases. Only nodes that are
283 participating in the VNN map can become lmaster or dmaster
284 for database records.
285 </para>
286 </refsect3>
288 <refsect3>
289 <title>Recovery mode</title>
290 <para>
291 This is the current recovery mode of the cluster. There are two possible modes:
292 </para>
293 <para>
294 NORMAL - The cluster is fully operational.
295 </para>
296 <para>
297 RECOVERY - The cluster databases have all been frozen, pausing all services while the cluster awaits a recovery process to complete. A recovery process should finish within seconds. If a cluster is stuck in the RECOVERY state this would indicate a cluster malfunction which needs to be investigated.
298 </para>
299 <para>
300 Once the recovery master detects an inconsistency, for example a node
301 becomes disconnected/connected, the recovery daemon will trigger a
302 cluster recovery process, where all databases are remerged across the
303 cluster. When this process starts, the recovery master will first
304 "freeze" all databases to prevent applications such as samba from
305 accessing the databases and it will also mark the recovery mode as
306 RECOVERY.
307 </para>
308 <para>
309 When the CTDB daemon starts up, it will start in RECOVERY
310 mode. Once the node has been merged into a cluster and all
311 databases have been recovered, the node mode will change into
312 NORMAL mode and the databases will be "thawed", allowing samba
313 to access the databases again.
314 </para>
315 </refsect3>
316 <refsect3>
317 <title>Recovery master</title>
318 <para>
319 This is the cluster node that is currently designated as the recovery master. This node is responsible of monitoring the consistency of the cluster and to perform the actual recovery process when reqired.
320 </para>
321 <para>
322 Only one node at a time can be the designated recovery master. Which
323 node is designated the recovery master is decided by an election
324 process in the recovery daemons running on each node.
325 </para>
326 </refsect3>
328 <refsect3>
329 <title>Example</title>
330 <screen>
331 # ctdb status
332 Number of nodes:4
333 pnn:0 192.168.2.200 OK (THIS NODE)
334 pnn:1 192.168.2.201 OK
335 pnn:2 192.168.2.202 OK
336 pnn:3 192.168.2.203 OK
337 Generation:1362079228
338 Size:4
339 hash:0 lmaster:0
340 hash:1 lmaster:1
341 hash:2 lmaster:2
342 hash:3 lmaster:3
343 Recovery mode:NORMAL (0)
344 Recovery master:0
345 </screen>
346 </refsect3>
347 </refsect2>
349 <refsect2>
350 <title>nodestatus <optional><parameter>PNN-LIST</parameter></optional></title>
351 <para>
352 This command is similar to the <command>status</command>
353 command. It displays the "node status" subset of output. The
354 main differences are:
355 </para>
357 <itemizedlist>
358 <listitem>
359 <para>
360 The exit code is the bitwise-OR of the flags for each
361 specified node, while <command>ctdb status</command> exits
362 with 0 if it was able to retrieve status for all nodes.
363 </para>
364 </listitem>
366 <listitem>
367 <para>
368 <command>ctdb status</command> provides status information
369 for all nodes. <command>ctdb nodestatus</command>
370 defaults to providing status for only the current node.
371 If PNN-LIST is provided then status is given for
372 the indicated node(s).
373 </para>
375 <para>
376 By default, <command>ctdb nodestatus</command> gathers
377 status from the local node. However, if invoked with "-n
378 all" (or similar) then status is gathered from the given
379 node(s). In particular <command>ctdb nodestatus
380 all</command> and <command>ctdb nodestatus -n
381 all</command> will produce different output. It is
382 possible to provide 2 different nodespecs (with and
383 without "-n") but the output is usually confusing!
384 </para>
385 </listitem>
386 </itemizedlist>
388 <para>
389 A common invocation in scripts is <command>ctdb nodestatus
390 all</command> to check whether all nodes in a cluster are
391 healthy.
392 </para>
394 <refsect3>
395 <title>Example</title>
396 <screen>
397 # ctdb nodestatus
398 pnn:0 10.0.0.30 OK (THIS NODE)
400 # ctdb nodestatus all
401 Number of nodes:2
402 pnn:0 10.0.0.30 OK (THIS NODE)
403 pnn:1 10.0.0.31 OK
404 </screen>
405 </refsect3>
406 </refsect2>
408 <refsect2>
409 <title>recmaster</title>
410 <para>
411 This command shows the pnn of the node which is currently the recmaster.
412 </para>
414 <para>
415 Note: If the the queried node is INACTIVE then the status
416 might not be current.
417 </para>
418 </refsect2>
420 <refsect2>
421 <title>uptime</title>
422 <para>
423 This command shows the uptime for the ctdb daemon. When the last recovery or ip-failover completed and how long it took. If the "duration" is shown as a negative number, this indicates that there is a recovery/failover in progress and it started that many seconds ago.
424 </para>
426 <refsect3>
427 <title>Example</title>
428 <screen>
429 # ctdb uptime
430 Current time of node : Thu Oct 29 10:38:54 2009
431 Ctdbd start time : (000 16:54:28) Wed Oct 28 17:44:26 2009
432 Time of last recovery/failover: (000 16:53:31) Wed Oct 28 17:45:23 2009
433 Duration of last recovery/failover: 2.248552 seconds
434 </screen>
435 </refsect3>
436 </refsect2>
438 <refsect2>
439 <title>listnodes</title>
440 <para>
441 This command shows lists the ip addresses of all the nodes in the cluster.
442 </para>
444 <refsect3>
445 <title>Example</title>
446 <screen>
447 # ctdb listnodes
448 192.168.2.200
449 192.168.2.201
450 192.168.2.202
451 192.168.2.203
452 </screen>
453 </refsect3>
454 </refsect2>
456 <refsect2>
457 <title>natgwlist</title>
458 <para>
459 Show the current NAT gateway master and the status of all
460 nodes in the current NAT gateway group. See the
461 <citetitle>NAT GATEWAY</citetitle> section in
462 <citerefentry><refentrytitle>ctdb</refentrytitle>
463 <manvolnum>7</manvolnum></citerefentry> for more details.
464 </para>
466 <refsect3>
467 <title>Example</title>
468 <screen>
469 # ctdb natgwlist
470 0 192.168.2.200
471 Number of nodes:4
472 pnn:0 192.168.2.200 OK (THIS NODE)
473 pnn:1 192.168.2.201 OK
474 pnn:2 192.168.2.202 OK
475 pnn:3 192.168.2.203 OK
476 </screen>
477 </refsect3>
478 </refsect2>
480 <refsect2>
481 <title>ping</title>
482 <para>
483 This command will "ping" specified CTDB nodes in the cluster
484 to verify that they are running.
485 </para>
486 <refsect3>
487 <title>Example</title>
488 <screen>
489 # ctdb ping -n all
490 response from 0 time=0.000054 sec (3 clients)
491 response from 1 time=0.000144 sec (2 clients)
492 response from 2 time=0.000105 sec (2 clients)
493 response from 3 time=0.000114 sec (2 clients)
494 </screen>
495 </refsect3>
496 </refsect2>
498 <refsect2>
499 <title>ifaces</title>
500 <para>
501 This command will display the list of network interfaces, which could
502 host public addresses, along with their status.
503 </para>
504 <refsect3>
505 <title>Example</title>
506 <screen>
507 # ctdb ifaces
508 Interfaces on node 0
509 name:eth5 link:up references:2
510 name:eth4 link:down references:0
511 name:eth3 link:up references:1
512 name:eth2 link:up references:1
514 # ctdb ifaces -Y
515 :Name:LinkStatus:References:
516 :eth5:1:2
517 :eth4:0:0
518 :eth3:1:1
519 :eth2:1:1
520 </screen>
521 </refsect3>
522 </refsect2>
524 <refsect2>
525 <title>ip</title>
526 <para>
527 This command will display the list of public addresses that are provided by the cluster and which physical node is currently serving this ip. By default this command will ONLY show those public addresses that are known to the node itself. To see the full list of all public ips across the cluster you must use "ctdb ip -n all".
528 </para>
529 <refsect3>
530 <title>Example</title>
531 <screen>
532 # ctdb ip
533 Public IPs on node 0
534 172.31.91.82 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
535 172.31.91.83 node[0] active[eth3] available[eth2,eth3] configured[eth2,eth3]
536 172.31.91.84 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
537 172.31.91.85 node[0] active[eth2] available[eth2,eth3] configured[eth2,eth3]
538 172.31.92.82 node[1] active[] available[eth5] configured[eth4,eth5]
539 172.31.92.83 node[0] active[eth5] available[eth5] configured[eth4,eth5]
540 172.31.92.84 node[1] active[] available[eth5] configured[eth4,eth5]
541 172.31.92.85 node[0] active[eth5] available[eth5] configured[eth4,eth5]
543 # ctdb ip -Y
544 :Public IP:Node:ActiveInterface:AvailableInterfaces:ConfiguredInterfaces:
545 :172.31.91.82:1::eth2,eth3:eth2,eth3:
546 :172.31.91.83:0:eth3:eth2,eth3:eth2,eth3:
547 :172.31.91.84:1::eth2,eth3:eth2,eth3:
548 :172.31.91.85:0:eth2:eth2,eth3:eth2,eth3:
549 :172.31.92.82:1::eth5:eth4,eth5:
550 :172.31.92.83:0:eth5:eth5:eth4,eth5:
551 :172.31.92.84:1::eth5:eth4,eth5:
552 :172.31.92.85:0:eth5:eth5:eth4,eth5:
553 </screen>
554 </refsect3>
555 </refsect2>
557 <refsect2>
558 <title>ipinfo <parameter>IP</parameter></title>
559 <para>
560 This command will display details about the specified public addresses.
561 </para>
562 <refsect3>
563 <title>Example</title>
564 <screen>
565 # ctdb ipinfo 172.31.92.85
566 Public IP[172.31.92.85] info on node 0
567 IP:172.31.92.85
568 CurrentNode:0
569 NumInterfaces:2
570 Interface[1]: Name:eth4 Link:down References:0
571 Interface[2]: Name:eth5 Link:up References:2 (active)
572 </screen>
573 </refsect3>
574 </refsect2>
576 <refsect2>
577 <title>scriptstatus</title>
578 <para>
579 This command displays which scripts where run in the previous monitoring cycle and the result of each script. If a script failed with an error, causing the node to become unhealthy, the output from that script is also shown.
580 </para>
581 <refsect3>
582 <title>Example</title>
583 <screen>
584 # ctdb scriptstatus
585 7 scripts were executed last monitoring cycle
586 00.ctdb Status:OK Duration:0.056 Tue Mar 24 18:56:57 2009
587 10.interface Status:OK Duration:0.077 Tue Mar 24 18:56:57 2009
588 11.natgw Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
589 20.multipathd Status:OK Duration:0.038 Tue Mar 24 18:56:57 2009
590 31.clamd Status:DISABLED
591 40.vsftpd Status:OK Duration:0.045 Tue Mar 24 18:56:57 2009
592 41.httpd Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
593 50.samba Status:ERROR Duration:0.082 Tue Mar 24 18:56:57 2009
594 OUTPUT:ERROR: Samba tcp port 445 is not responding
595 </screen>
596 </refsect3>
597 </refsect2>
599 <refsect2>
600 <title>disablescript <parameter>SCRIPT</parameter></title>
601 <para>
602 This command is used to disable an eventscript.
603 </para>
604 <para>
605 This will take effect the next time the eventscripts are being executed so it can take a short while until this is reflected in 'scriptstatus'.
606 </para>
607 </refsect2>
609 <refsect2>
610 <title>enablescript <parameter>SCRIPT</parameter></title>
611 <para>
612 This command is used to enable an eventscript.
613 </para>
614 <para>
615 This will take effect the next time the eventscripts are being executed so it can take a short while until this is reflected in 'scriptstatus'.
616 </para>
617 </refsect2>
619 <refsect2>
620 <title>listvars</title>
621 <para>
622 List all tuneable variables, except the values of the obsolete tunables
623 like VacuumMinInterval. The obsolete tunables can be retrieved only
624 explicitly with the "ctdb getvar" command.
625 </para>
626 <refsect3>
627 <title>Example</title>
628 <screen>
629 # ctdb listvars
630 MaxRedirectCount = 3
631 SeqnumInterval = 1000
632 ControlTimeout = 60
633 TraverseTimeout = 20
634 KeepaliveInterval = 5
635 KeepaliveLimit = 5
636 RecoverTimeout = 20
637 RecoverInterval = 1
638 ElectionTimeout = 3
639 TakeoverTimeout = 9
640 MonitorInterval = 15
641 TickleUpdateInterval = 20
642 EventScriptTimeout = 30
643 EventScriptTimeoutCount = 1
644 RecoveryGracePeriod = 120
645 RecoveryBanPeriod = 300
646 DatabaseHashSize = 100001
647 DatabaseMaxDead = 5
648 RerecoveryTimeout = 10
649 EnableBans = 1
650 DeterministicIPs = 0
651 LCP2PublicIPs = 1
652 ReclockPingPeriod = 60
653 NoIPFailback = 0
654 DisableIPFailover = 0
655 VerboseMemoryNames = 0
656 RecdPingTimeout = 60
657 RecdFailCount = 10
658 LogLatencyMs = 0
659 RecLockLatencyMs = 1000
660 RecoveryDropAllIPs = 120
661 VerifyRecoveryLock = 1
662 VacuumInterval = 10
663 VacuumMaxRunTime = 30
664 RepackLimit = 10000
665 VacuumLimit = 5000
666 VacuumFastPathCount = 60
667 MaxQueueDropMsg = 1000000
668 UseStatusEvents = 0
669 AllowUnhealthyDBRead = 0
670 StatHistoryInterval = 1
671 DeferredAttachTO = 120
672 AllowClientDBAttach = 1
673 RecoverPDBBySeqNum = 0
674 </screen>
675 </refsect3>
676 </refsect2>
678 <refsect2>
679 <title>getvar <parameter>NAME</parameter></title>
680 <para>
681 Get the runtime value of a tuneable variable.
682 </para>
683 <refsect3>
684 <title>Example</title>
685 <screen>
686 # ctdb getvar MaxRedirectCount
687 MaxRedirectCount = 3
688 </screen>
689 </refsect3>
690 </refsect2>
692 <refsect2>
693 <title>setvar <parameter>NAME</parameter> <parameter>VALUE</parameter></title>
694 <para>
695 Set the runtime value of a tuneable variable.
696 </para>
697 <para>
698 Example: ctdb setvar MaxRedirectCount 5
699 </para>
700 </refsect2>
702 <refsect2>
703 <title>lvsmaster</title>
704 <para>
705 This command shows which node is currently the LVSMASTER. The
706 LVSMASTER is the node in the cluster which drives the LVS system and
707 which receives all incoming traffic from clients.
708 </para>
709 <para>
710 LVS is the mode where the entire CTDB/Samba cluster uses a single
711 ip address for the entire cluster. In this mode all clients connect to
712 one specific node which will then multiplex/loadbalance the clients
713 evenly onto the other nodes in the cluster. This is an alternative to using
714 public ip addresses. See the manpage for ctdbd for more information
715 about LVS.
716 </para>
717 </refsect2>
719 <refsect2>
720 <title>lvs</title>
721 <para>
722 This command shows which nodes in the cluster are currently active in the
723 LVS configuration. I.e. which nodes we are currently loadbalancing
724 the single ip address across.
725 </para>
727 <para>
728 LVS will by default only loadbalance across those nodes that are both
729 LVS capable and also HEALTHY. Except if all nodes are UNHEALTHY in which
730 case LVS will loadbalance across all UNHEALTHY nodes as well.
731 LVS will never use nodes that are DISCONNECTED, STOPPED, BANNED or
732 DISABLED.
733 </para>
735 <para>
736 Example output:
737 </para>
738 <screen>
739 2:10.0.0.13
740 3:10.0.0.14
741 </screen>
743 </refsect2>
746 <refsect2>
747 <title>getcapabilities</title>
749 <para>
750 This command shows the capabilities of the current node. See
751 the <citetitle>CAPABILITIES</citetitle> section in
752 <citerefentry><refentrytitle>ctdb</refentrytitle>
753 <manvolnum>7</manvolnum></citerefentry> for more details.
754 </para>
756 <para>
757 Example output:
758 </para>
759 <screen>
760 RECMASTER: YES
761 LMASTER: YES
762 LVS: NO
763 NATGW: YES
764 </screen>
766 </refsect2>
768 <refsect2>
769 <title>statistics</title>
770 <para>
771 Collect statistics from the CTDB daemon about how many calls it has served.
772 </para>
773 <refsect3>
774 <title>Example</title>
775 <screen>
776 # ctdb statistics
777 CTDB version 1
778 num_clients 3
779 frozen 0
780 recovering 0
781 client_packets_sent 360489
782 client_packets_recv 360466
783 node_packets_sent 480931
784 node_packets_recv 240120
785 keepalive_packets_sent 4
786 keepalive_packets_recv 3
787 node
788 req_call 2
789 reply_call 2
790 req_dmaster 0
791 reply_dmaster 0
792 reply_error 0
793 req_message 42
794 req_control 120408
795 reply_control 360439
796 client
797 req_call 2
798 req_message 24
799 req_control 360440
800 timeouts
801 call 0
802 control 0
803 traverse 0
804 total_calls 2
805 pending_calls 0
806 lockwait_calls 0
807 pending_lockwait_calls 0
808 memory_used 5040
809 max_hop_count 0
810 max_call_latency 4.948321 sec
811 max_lockwait_latency 0.000000 sec
812 </screen>
813 </refsect3>
814 </refsect2>
816 <refsect2>
817 <title>statisticsreset</title>
818 <para>
819 This command is used to clear all statistics counters in a node.
820 </para>
821 <para>
822 Example: ctdb statisticsreset
823 </para>
824 </refsect2>
826 <refsect2>
827 <title>dbstatistics <parameter>DB</parameter></title>
828 <para>
829 Display statistics about the database DB.
830 </para>
831 <refsect3>
832 <title>Example</title>
833 <screen>
834 # ctdb dbstatistics locking.tdb
835 DB Statistics: locking.tdb
836 ro_delegations 0
837 ro_revokes 0
838 locks
839 total 14356
840 failed 0
841 current 0
842 pending 0
843 hop_count_buckets: 28087 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0
844 lock_buckets: 0 14188 38 76 32 19 3 0 0 0 0 0 0 0 0 0
845 locks_latency MIN/AVG/MAX 0.001066/0.012686/4.202292 sec out of 14356
846 Num Hot Keys: 1
847 Count:8 Key:ff5bd7cb3ee3822edc1f0000000000000000000000000000
848 </screen>
849 </refsect3>
850 </refsect2>
852 <refsect2>
853 <title>getreclock</title>
854 <para>
855 This command is used to show the filename of the reclock file that is used.
856 </para>
858 <para>
859 Example output:
860 </para>
861 <screen>
862 Reclock file:/gpfs/.ctdb/shared
863 </screen>
865 </refsect2>
867 <refsect2>
868 <title>setreclock [filename]</title>
869 <para>
870 This command is used to modify, or clear, the file that is used as the reclock file at runtime. When this command is used, the reclock file checks are disabled. To re-enable the checks the administrator needs to activate the "VerifyRecoveryLock" tunable using "ctdb setvar".
871 </para>
873 <para>
874 If run with no parameter this will remove the reclock file completely. If run with a parameter the parameter specifies the new filename to use for the recovery lock.
875 </para>
877 <para>
878 This command only affects the runtime settings of a ctdb node and will be lost when ctdb is restarted. For persistent changes to the reclock file setting you must edit /etc/sysconfig/ctdb.
879 </para>
880 </refsect2>
884 <refsect2>
885 <title>getdebug</title>
886 <para>
887 Get the current debug level for the node. the debug level controls what information is written to the log file.
888 </para>
889 <para>
890 The debug levels are mapped to the corresponding syslog levels.
891 When a debug level is set, only those messages at that level and higher
892 levels will be printed.
893 </para>
894 <para>
895 The list of debug levels from highest to lowest are :
896 </para>
897 <para>
898 EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG
899 </para>
900 </refsect2>
902 <refsect2>
903 <title>setdebug <parameter>DEBUGLEVEL</parameter></title>
904 <para>
905 Set the debug level of a node. This controls what information will be logged.
906 </para>
907 <para>
908 The debuglevel is one of EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG
909 </para>
910 </refsect2>
912 <refsect2>
913 <title>getpid</title>
914 <para>
915 This command will return the process id of the ctdb daemon.
916 </para>
917 </refsect2>
919 <refsect2>
920 <title>disable</title>
921 <para>
922 This command is used to administratively disable a node in the cluster.
923 A disabled node will still participate in the cluster and host
924 clustered TDB records but its public ip address has been taken over by
925 a different node and it no longer hosts any services.
926 </para>
927 </refsect2>
929 <refsect2>
930 <title>enable</title>
931 <para>
932 Re-enable a node that has been administratively disabled.
933 </para>
934 </refsect2>
936 <refsect2>
937 <title>stop</title>
938 <para>
939 This command is used to administratively STOP a node in the cluster.
940 A STOPPED node is connected to the cluster but will not host any
941 public ip addresse, nor does it participate in the VNNMAP.
942 The difference between a DISABLED node and a STOPPED node is that
943 a STOPPED node does not host any parts of the database which means
944 that a recovery is required to stop/continue nodes.
945 </para>
946 </refsect2>
948 <refsect2>
949 <title>continue</title>
950 <para>
951 Re-start a node that has been administratively stopped.
952 </para>
953 </refsect2>
955 <refsect2>
956 <title>addip <parameter>IPADDR</parameter>/<parameter>mask</parameter> <parameter>IFACE</parameter></title>
957 <para>
958 This command is used to add a new public ip to a node during runtime.
959 This allows public addresses to be added to a cluster without having
960 to restart the ctdb daemons.
961 </para>
962 <para>
963 Note that this only updates the runtime instance of ctdb. Any changes will be lost next time ctdb is restarted and the public addresses file is re-read.
964 If you want this change to be permanent you must also update the public addresses file manually.
965 </para>
966 </refsect2>
968 <refsect2>
969 <title>delip <parameter>IPADDR</parameter></title>
970 <para>
971 This command is used to remove a public ip from a node during runtime.
972 If this public ip is currently hosted by the node it being removed from, the ip will first be failed over to another node, if possible, before it is removed.
973 </para>
974 <para>
975 Note that this only updates the runtime instance of ctdb. Any changes will be lost next time ctdb is restarted and the public addresses file is re-read.
976 If you want this change to be permanent you must also update the public addresses file manually.
977 </para>
978 </refsect2>
980 <refsect2>
981 <title>moveip <parameter>IPADDR</parameter> <parameter>PNN</parameter></title>
982 <para>
983 This command can be used to manually fail a public ip address to a
984 specific node.
985 </para>
986 <para>
987 In order to manually override the "automatic" distribution of public
988 ip addresses that ctdb normally provides, this command only works
989 when you have changed the tunables for the daemon to:
990 </para>
991 <para>
992 DeterministicIPs = 0
993 </para>
994 <para>
995 NoIPFailback = 1
996 </para>
997 </refsect2>
999 <refsect2>
1000 <title>shutdown</title>
1001 <para>
1002 This command will shutdown a specific CTDB daemon.
1003 </para>
1004 </refsect2>
1006 <refsect2>
1007 <title>setlmasterrole on|off</title>
1008 <para>
1009 This command is used ot enable/disable the LMASTER capability for a node at runtime. This capability determines whether or not a node can be used as an LMASTER for records in the database. A node that does not have the LMASTER capability will not show up in the vnnmap.
1010 </para>
1012 <para>
1013 Nodes will by default have this capability, but it can be stripped off nodes by the setting in the sysconfig file or by using this command.
1014 </para>
1015 <para>
1016 Once this setting has been enabled/disabled, you need to perform a recovery for it to take effect.
1017 </para>
1018 <para>
1019 See also "ctdb getcapabilities"
1020 </para>
1021 </refsect2>
1023 <refsect2>
1024 <title>setrecmasterrole on|off</title>
1025 <para>
1026 This command is used ot enable/disable the RECMASTER capability for a node at runtime. This capability determines whether or not a node can be used as an RECMASTER for the cluster. A node that does not have the RECMASTER capability can not win a recmaster election. A node that already is the recmaster for the cluster when the capability is stripped off the node will remain the recmaster until the next cluster election.
1027 </para>
1029 <para>
1030 Nodes will by default have this capability, but it can be stripped off nodes by the setting in the sysconfig file or by using this command.
1031 </para>
1032 <para>
1033 See also "ctdb getcapabilities"
1034 </para>
1035 </refsect2>
1037 <refsect2>
1038 <title>reloadnodes</title>
1039 <para>
1040 This command is used when adding new nodes, or removing existing nodes from an existing cluster.
1041 </para>
1042 <para>
1043 Procedure to add a node:
1044 </para>
1045 <para>
1046 1, To expand an existing cluster, first ensure with 'ctdb status' that
1047 all nodes are up and running and that they are all healthy.
1048 Do not try to expand a cluster unless it is completely healthy!
1049 </para>
1050 <para>
1051 2, On all nodes, edit /etc/ctdb/nodes and add the new node as the last
1052 entry to the file. The new node MUST be added to the end of this file!
1053 </para>
1054 <para>
1055 3, Verify that all the nodes have identical /etc/ctdb/nodes files after you edited them and added the new node!
1056 </para>
1057 <para>
1058 4, Run 'ctdb reloadnodes' to force all nodes to reload the nodesfile.
1059 </para>
1060 <para>
1061 5, Use 'ctdb status' on all nodes and verify that they now show the additional node.
1062 </para>
1063 <para>
1064 6, Install and configure the new node and bring it online.
1065 </para>
1066 <para>
1067 Procedure to remove a node:
1068 </para>
1069 <para>
1070 1, To remove a node from an existing cluster, first ensure with 'ctdb status' that
1071 all nodes, except the node to be deleted, are up and running and that they are all healthy.
1072 Do not try to remove a node from a cluster unless the cluster is completely healthy!
1073 </para>
1074 <para>
1075 2, Shutdown and poweroff the node to be removed.
1076 </para>
1077 <para>
1078 3, On all other nodes, edit the /etc/ctdb/nodes file and comment out the node to be removed. Do not delete the line for that node, just comment it out by adding a '#' at the beginning of the line.
1079 </para>
1080 <para>
1081 4, Run 'ctdb reloadnodes' to force all nodes to reload the nodesfile.
1082 </para>
1083 <para>
1084 5, Use 'ctdb status' on all nodes and verify that the deleted node no longer shows up in the list..
1085 </para>
1086 <para>
1087 </para>
1089 </refsect2>
1091 <refsect2>
1092 <title>
1093 reloadips
1094 <optional><parameter>PNN-LIST</parameter></optional>
1095 </title>
1096 <para>
1097 This command reloads the public addresses configuration file
1098 on the specified nodes. When it completes addresses will be
1099 reconfigured and reassigned across the cluster as necessary.
1100 </para>
1101 </refsect2>
1103 <refsect2>
1104 <title>getdbmap</title>
1105 <para>
1106 This command lists all clustered TDB databases that the CTDB daemon has attached to. Some databases are flagged as PERSISTENT, this means that the database stores data persistently and the data will remain across reboots. One example of such a database is secrets.tdb where information about how the cluster was joined to the domain is stored.
1107 </para>
1108 <para>
1109 If a PERSISTENT database is not in a healthy state the database is
1110 flagged as UNHEALTHY. If there's at least one completely healthy node running in
1111 the cluster, it's possible that the content is restored by a recovery
1112 run automaticly. Otherwise an administrator needs to analyze the
1113 problem.
1114 </para>
1115 <para>
1116 See also "ctdb getdbstatus", "ctdb backupdb", "ctdb restoredb",
1117 "ctdb dumpbackup", "ctdb wipedb", "ctdb setvar AllowUnhealthyDBRead 1"
1118 and (if samba or tdb-utils are installed) "tdbtool check".
1119 </para>
1120 <para>
1121 Most databases are not persistent and only store the state information that the currently running samba daemons need. These databases are always wiped when ctdb/samba starts and when a node is rebooted.
1122 </para>
1124 <refsect3>
1125 <title>Example</title>
1126 <screen>
1127 # ctdb getdbmap
1128 Number of databases:10
1129 dbid:0x435d3410 name:notify.tdb path:/var/ctdb/notify.tdb.0
1130 dbid:0x42fe72c5 name:locking.tdb path:/var/ctdb/locking.tdb.0
1131 dbid:0x1421fb78 name:brlock.tdb path:/var/ctdb/brlock.tdb.0
1132 dbid:0x17055d90 name:connections.tdb path:/var/ctdb/connections.tdb.0
1133 dbid:0xc0bdde6a name:sessionid.tdb path:/var/ctdb/sessionid.tdb.0
1134 dbid:0x122224da name:test.tdb path:/var/ctdb/test.tdb.0
1135 dbid:0x2672a57f name:idmap2.tdb path:/var/ctdb/persistent/idmap2.tdb.0 PERSISTENT
1136 dbid:0xb775fff6 name:secrets.tdb path:/var/ctdb/persistent/secrets.tdb.0 PERSISTENT
1137 dbid:0xe98e08b6 name:group_mapping.tdb path:/var/ctdb/persistent/group_mapping.tdb.0 PERSISTENT
1138 dbid:0x7bbbd26c name:passdb.tdb path:/var/ctdb/persistent/passdb.tdb.0 PERSISTENT
1140 # ctdb getdbmap # example for unhealthy database
1141 Number of databases:1
1142 dbid:0xb775fff6 name:secrets.tdb path:/var/ctdb/persistent/secrets.tdb.0 PERSISTENT UNHEALTHY
1144 # ctdb -Y getdbmap
1145 :ID:Name:Path:Persistent:Unhealthy:
1146 :0x7bbbd26c:passdb.tdb:/var/ctdb/persistent/passdb.tdb.0:1:0:
1147 </screen>
1148 </refsect3>
1149 </refsect2>
1151 <refsect2>
1152 <title>
1153 backupdb
1154 <parameter>DB</parameter>
1155 <parameter>FILE</parameter>
1156 </title>
1157 <para>
1158 Copy the contents of database DB to FILE. FILE can later be
1159 read back using <command>restoredb</command>. This is mainly
1160 useful for backing up persistent databases such as
1161 <filename>secrets.tdb</filename> and similar.
1162 </para>
1163 </refsect2>
1165 <refsect2>
1166 <title>
1167 restoredb
1168 <parameter>FILE</parameter>
1169 <optional><parameter>DB</parameter></optional>
1170 </title>
1171 <para>
1172 This command restores a persistent database that was
1173 previously backed up using backupdb. By default the data will
1174 be restored back into the same database as it was created
1175 from. By specifying dbname you can restore the data into a
1176 different database.
1177 </para>
1178 </refsect2>
1180 <refsect2>
1181 <title>getlog [<parameter>LEVEL</parameter>] [recoverd]</title>
1182 <para>
1183 In addition to the normal logging to a log file, CTDB also
1184 keeps a in-memory ringbuffer containing the most recent log
1185 entries for all log levels (except DEBUG).
1186 </para>
1187 <para>
1188 This is useful since it allows for keeping continuous logs to a file
1189 at a reasonable non-verbose level, but shortly after an incident has
1190 occured, a much more detailed log can be pulled from memory. This
1191 can allow you to avoid having to reproduce an issue due to the
1192 on-disk logs being of insufficient detail.
1193 </para>
1194 <para>
1195 This command extracts all messages of level or lower log level
1196 from memory and prints it to the screen. The level is not
1197 specified it defaults to NOTICE.
1198 </para>
1199 <para>
1200 By default, logs are extracted from the main CTDB daemon. If
1201 the recoverd option is given then logs are extracted from the
1202 recovery daemon.
1203 </para>
1204 </refsect2>
1206 <refsect2>
1207 <title>clearlog [recoverd]</title>
1208 <para>
1209 This command clears the in-memory logging ringbuffer.
1210 </para>
1211 <para>
1212 By default, logs are cleared in the main CTDB daemon. If the
1213 recoverd option is given then logs are cleared in the recovery
1214 daemon.
1215 </para>
1216 </refsect2>
1218 <refsect2>
1219 <title>setdbreadonly <parameter>DB</parameter></title>
1220 <para>
1221 This command will enable the read-only record support for a
1222 database. This is an experimental feature to improve
1223 performance for contended records primarily in locking.tdb and
1224 brlock.tdb. When enabling this feature you must set it on all
1225 nodes in the cluster.
1226 </para>
1227 </refsect2>
1229 <refsect2>
1230 <title>setdbsticky <parameter>DB</parameter></title>
1231 <para>
1232 This command will enable the sticky record support for the
1233 specified database. This is an experimental feature to
1234 improve performance for contended records primarily in
1235 locking.tdb and brlock.tdb. When enabling this feature you
1236 must set it on all nodes in the cluster.
1237 </para>
1238 </refsect2>
1240 </refsect1>
1242 <refsect1>
1243 <title>INTERNAL COMMANDS</title>
1245 <para>
1246 Internal commands are used by CTDB's scripts and are not
1247 required for managing a CTDB cluster. Their parameters and
1248 behaviour are subject to change.
1249 </para>
1251 <refsect2>
1252 <title>gettickles <parameter>IPADDR</parameter></title>
1253 <para>
1254 Show TCP connections that are registered with CTDB to be
1255 "tickled" if there is a failover.
1256 </para>
1257 </refsect2>
1259 <refsect2>
1260 <title>gratiousarp <parameter>IPADDR</parameter> <parameter>INTERFACE</parameter></title>
1261 <para>
1262 Send out a gratious ARP for the specified interface through
1263 the specified interface. This command is mainly used by the
1264 ctdb eventscripts.
1265 </para>
1266 </refsect2>
1268 <refsect2>
1269 <title>killtcp</title>
1270 <para>
1271 Read a list of TCP connections, one per line, from standard
1272 input and terminate each connection. A connection is
1273 specified as:
1274 </para>
1275 <synopsis>
1276 <parameter>SRC-IPADDR</parameter>:<parameter>SRC-PORT</parameter> <parameter>DST-IPADDR</parameter>:<parameter>DST-PORT</parameter>
1277 </synopsis>
1278 <para>
1279 Each connection is terminated by issuing a TCP RST to the
1280 SRC-IPADDR:SRC-PORT endpoint.
1281 </para>
1282 <para>
1283 A single connection can be specified on the command-line
1284 rather than on standard input.
1285 </para>
1286 </refsect2>
1288 <refsect2>
1289 <title>
1290 pdelete <parameter>DB</parameter> <parameter>KEY</parameter>
1291 </title>
1292 <para>
1293 Delete KEY from DB.
1294 </para>
1295 </refsect2>
1297 <refsect2>
1298 <title>
1299 pfetch <parameter>DB</parameter> <parameter>KEY</parameter>
1300 </title>
1301 <para>
1302 Print the value associated with KEY in DB.
1303 </para>
1304 </refsect2>
1306 <refsect2>
1307 <title>
1308 pstore
1309 <parameter>DB</parameter>
1310 <parameter>KEY</parameter>
1311 <parameter>FILE</parameter>
1312 </title>
1313 <para>
1314 Store KEY in DB with contents of FILE as the associated value.
1315 </para>
1316 </refsect2>
1318 <refsect2>
1319 <title>
1320 ptrans
1321 <parameter>DB</parameter>
1322 <optional><parameter>FILE</parameter></optional>
1323 </title>
1324 <para>
1325 Read a list of key-value pairs, one per line from FILE, and
1326 store them in DB using a single transaction. An empty value
1327 is equivalent to deleting the given key.
1328 </para>
1329 <para>
1330 The key and value should be separated by spaces or tabs. Each
1331 key/value should be a printable string enclosed in
1332 double-quotes.
1333 </para>
1334 </refsect2>
1336 <refsect2>
1337 <title>runstate [setup|first_recovery|startup|running]</title>
1338 <para>
1339 Print the runstate of the specified node. Runstates are used
1340 to serialise important state transitions in CTDB, particularly
1341 during startup.
1342 </para>
1343 <para>
1344 If one or more optional runstate arguments are specified then
1345 the node must be in one of these runstates for the command to
1346 succeed.
1347 </para>
1348 <refsect3>
1349 <title>Example</title>
1350 <screen>
1351 # ctdb runstate
1352 RUNNING
1353 </screen>
1354 </refsect3>
1355 </refsect2>
1357 <refsect2>
1358 <title>setifacelink <parameter>IFACE</parameter> up|down</title>
1359 <para>
1360 Set the internal state of network interface IFACE. This is
1361 typically used in the <filename>10.interface</filename> script
1362 in the "monitor" event.
1363 </para>
1364 <para>
1365 Example: ctdb setifacelink eth0 up
1366 </para>
1367 </refsect2>
1369 <refsect2>
1370 <title>setnatgwstate on|off</title>
1371 <para>
1372 Enable or disable the NAT gateway master capability on a node.
1373 </para>
1374 </refsect2>
1376 <refsect2>
1377 <title>tickle <parameter>SRC-IPADDR</parameter>:<parameter>SRC-PORT</parameter> <parameter>DST-IPADDR</parameter>:<parameter>DST-PORT</parameter></title>
1378 <para>
1379 Send a TCP tickle to the source host for the specified TCP
1380 connection. A TCP tickle is a TCP ACK packet with an invalid
1381 sequence and acknowledge number and will when received by the
1382 source host result in it sending an immediate correct ACK back
1383 to the other end.
1384 </para>
1385 <para>
1386 TCP tickles are useful to "tickle" clients after a IP failover has
1387 occured since this will make the client immediately recognize the
1388 TCP connection has been disrupted and that the client will need
1389 to reestablish. This greatly speeds up the time it takes for a client
1390 to detect and reestablish after an IP failover in the ctdb cluster.
1391 </para>
1392 </refsect2>
1394 <refsect2>
1395 <title>version</title>
1396 <para>
1397 Display the CTDB version.
1398 </para>
1399 </refsect2>
1401 </refsect1>
1403 <refsect1>
1404 <title>DEBUGGING COMMANDS</title>
1405 <para>
1406 These commands are primarily used for CTDB development and testing and
1407 should not be used for normal administration.
1408 </para>
1411 <refsect2>
1412 <title>OPTIONS</title>
1414 <variablelist>
1415 <varlistentry><term>--print-emptyrecords</term>
1416 <listitem>
1417 <para>
1418 This enables printing of empty records when dumping databases
1419 with the catdb, cattbd and dumpdbbackup commands. Records with
1420 empty data segment are considered deleted by ctdb and cleaned
1421 by the vacuuming mechanism, so this switch can come in handy for
1422 debugging the vacuuming behaviour.
1423 </para>
1424 </listitem>
1425 </varlistentry>
1427 <varlistentry><term>--print-datasize</term>
1428 <listitem>
1429 <para>
1430 This lets database dumps (catdb, cattdb, dumpdbbackup) print the
1431 size of the record data instead of dumping the data contents.
1432 </para>
1433 </listitem>
1434 </varlistentry>
1436 <varlistentry><term>--print-lmaster</term>
1437 <listitem>
1438 <para>
1439 This lets catdb print the lmaster for each record.
1440 </para>
1441 </listitem>
1442 </varlistentry>
1444 <varlistentry><term>--print-hash</term>
1445 <listitem>
1446 <para>
1447 This lets database dumps (catdb, cattdb, dumpdbbackup) print the
1448 hash for each record.
1449 </para>
1450 </listitem>
1451 </varlistentry>
1453 <varlistentry><term>--print-recordflags</term>
1454 <listitem>
1455 <para>
1456 This lets catdb and dumpdbbackup print the
1457 record flags for each record. Note that cattdb always
1458 prints the flags.
1459 </para>
1460 </listitem>
1461 </varlistentry>
1463 </variablelist>
1464 </refsect2>
1466 <refsect2>
1467 <title>process-exists <parameter>PID</parameter></title>
1468 <para>
1469 This command checks if a specific process exists on the CTDB host. This is mainly used by Samba to check if remote instances of samba are still running or not.
1470 </para>
1471 </refsect2>
1473 <refsect2>
1474 <title>getdbstatus <parameter>DB</parameter></title>
1475 <para>
1476 This command displays more details about a database.
1477 </para>
1478 <refsect3>
1479 <title>Example</title>
1480 <screen>
1481 # ctdb getdbstatus test.tdb.0
1482 dbid: 0x122224da
1483 name: test.tdb
1484 path: /var/ctdb/test.tdb.0
1485 PERSISTENT: no
1486 HEALTH: OK
1488 # ctdb getdbstatus registry.tdb # with a corrupted TDB
1489 dbid: 0xf2a58948
1490 name: registry.tdb
1491 path: /var/ctdb/persistent/registry.tdb.0
1492 PERSISTENT: yes
1493 HEALTH: NO-HEALTHY-NODES - ERROR - Backup of corrupted TDB in '/var/ctdb/persistent/registry.tdb.0.corrupted.20091208091949.0Z'
1494 </screen>
1495 </refsect3>
1496 </refsect2>
1498 <refsect2>
1499 <title>catdb <parameter>DB</parameter></title>
1500 <para>
1501 Print a dump of the clustered TDB database DB.
1502 </para>
1503 </refsect2>
1505 <refsect2>
1506 <title>cattdb <parameter>DB</parameter></title>
1507 <para>
1508 Print a dump of the contents of the local TDB database DB.
1509 </para>
1510 </refsect2>
1512 <refsect2>
1513 <title>dumpdbbackup <parameter>FILE</parameter></title>
1514 <para>
1515 Print a dump of the contents from database backup FILE,
1516 similar to <command>catdb</command>.
1517 </para>
1518 </refsect2>
1520 <refsect2>
1521 <title>wipedb <parameter>DB</parameter></title>
1522 <para>
1523 Remove all contents of database DB.
1524 </para>
1525 </refsect2>
1527 <refsect2>
1528 <title>recover</title>
1529 <para>
1530 This command will trigger the recovery daemon to do a cluster
1531 recovery.
1532 </para>
1533 </refsect2>
1535 <refsect2>
1536 <title>ipreallocate, sync</title>
1537 <para>
1538 This command will force the recovery master to perform a full ip reallocation process and redistribute all ip addresses. This is useful to "reset" the allocations back to its default state if they have been changed using the "moveip" command. While a "recover" will also perform this reallocation, a recovery is much more hevyweight since it will also rebuild all the databases.
1539 </para>
1540 </refsect2>
1542 <refsect2>
1543 <title>getmonmode</title>
1544 <para>
1545 This command returns the monutoring mode of a node. The monitoring mode is either ACTIVE or DISABLED. Normally a node will continuously monitor that all other nodes that are expected are in fact connected and that they respond to commands.
1546 </para>
1547 <para>
1548 ACTIVE - This is the normal mode. The node is actively monitoring all other nodes, both that the transport is connected and also that the node responds to commands. If a node becomes unavailable, it will be marked as DISCONNECTED and a recovery is initiated to restore the cluster.
1549 </para>
1550 <para>
1551 DISABLED - This node is not monitoring that other nodes are available. In this mode a node failure will not be detected and no recovery will be performed. This mode is useful when for debugging purposes one wants to attach GDB to a ctdb process but wants to prevent the rest of the cluster from marking this node as DISCONNECTED and do a recovery.
1552 </para>
1553 </refsect2>
1556 <refsect2>
1557 <title>setmonmode 0|1</title>
1558 <para>
1559 This command can be used to explicitly disable/enable monitoring mode on a node. The main purpose is if one wants to attach GDB to a running ctdb daemon but wants to prevent the other nodes from marking it as DISCONNECTED and issuing a recovery. To do this, set monitoring mode to 0 on all nodes before attaching with GDB. Remember to set monitoring mode back to 1 afterwards.
1560 </para>
1561 </refsect2>
1563 <refsect2>
1564 <title>attach <parameter>DBNAME</parameter> [persistent]</title>
1565 <para>
1566 Create a new CTDB database called DBNAME and attach to it on
1567 all nodes.
1568 </para>
1569 </refsect2>
1571 <refsect2>
1572 <title>detach <parameter>DB-LIST</parameter></title>
1573 <para>
1574 Detach specified non-persistent database(s) from the cluster. This
1575 command will disconnect specified database(s) on all nodes in
1576 the cluster. This command should only be used when none of the
1577 specified database(s) are in use.
1578 </para>
1579 <para>
1580 All nodes should be active and tunable AllowClientDBAccess should
1581 be disabled on all nodes before detaching databases.
1582 </para>
1583 </refsect2>
1585 <refsect2>
1586 <title>dumpmemory</title>
1587 <para>
1588 This is a debugging command. This command will make the ctdb
1589 daemon to write a fill memory allocation map to standard output.
1590 </para>
1591 </refsect2>
1593 <refsect2>
1594 <title>rddumpmemory</title>
1595 <para>
1596 This is a debugging command. This command will dump the talloc memory
1597 allocation tree for the recovery daemon to standard output.
1598 </para>
1599 </refsect2>
1601 <refsect2>
1602 <title>thaw</title>
1603 <para>
1604 Thaw a previously frozen node.
1605 </para>
1606 </refsect2>
1609 <refsect2>
1610 <title>eventscript <parameter>ARGUMENTS</parameter></title>
1611 <para>
1612 This is a debugging command. This command can be used to manually
1613 invoke and run the eventscritps with arbitrary arguments.
1614 </para>
1615 </refsect2>
1617 <refsect2>
1618 <title>ban <parameter>BANTIME</parameter></title>
1619 <para>
1620 Administratively ban a node for BANTIME seconds. The node
1621 will be unbanned after BANTIME seconds have elapsed.
1622 </para>
1623 <para>
1624 A banned node does not participate in the cluster. It does
1625 not host any records for the clustered TDB and does not host
1626 any public IP addresses.
1627 </para>
1628 <para>
1629 Nodes are automatically banned if they misbehave. For
1630 example, a node may be banned if it causes too many cluster
1631 recoveries.
1632 </para>
1633 <para>
1634 To administratively exclude a node from a cluster use the
1635 <command>stop</command> command.
1636 </para>
1637 </refsect2>
1639 <refsect2>
1640 <title>unban</title>
1641 <para>
1642 This command is used to unban a node that has either been
1643 administratively banned using the ban command or has been
1644 automatically banned.
1645 </para>
1646 </refsect2>
1648 <refsect2>
1649 <title>
1650 rebalancenode
1651 <optional><parameter>PNN-LIST</parameter></optional>
1652 </title>
1653 <para>
1654 This command marks the given nodes as rebalance targets in the
1655 LCP2 IP allocation algorithm. The
1656 <command>reloadips</command> command will do this as necessary
1657 so this command should not be needed.
1658 </para>
1659 </refsect2>
1661 <refsect2>
1662 <title>check_srvids <parameter>SRVID</parameter> ...</title>
1663 <para>
1664 This command checks whether a set of srvid message ports are
1665 registered on the node or not. The command takes a list of
1666 values to check.
1667 </para>
1668 <refsect3>
1669 <title>Example</title>
1670 <screen>
1671 # ctdb check_srvids 1 2 3 14765
1672 Server id 0:1 does not exist
1673 Server id 0:2 does not exist
1674 Server id 0:3 does not exist
1675 Server id 0:14765 exists
1676 </screen>
1677 </refsect3>
1678 </refsect2>
1680 </refsect1>
1682 <!-- UNDOCUMENTED: showban stats disablemonitor enablemonitor
1683 isnotrecmaster addtickle deltickle regsrvid unregsrvid chksrvid
1684 getsrvids rebalanceip setdbprio getdbprio msglisten msgsend
1685 tfetch tstore readkey writekey
1686 checktcpport getdbseqnum ipiface
1687 -->
1689 <refsect1>
1690 <title>SEE ALSO</title>
1691 <para>
1692 <citerefentry><refentrytitle>ctdbd</refentrytitle>
1693 <manvolnum>1</manvolnum></citerefentry>,
1695 <citerefentry><refentrytitle>onnode</refentrytitle>
1696 <manvolnum>1</manvolnum></citerefentry>,
1698 <citerefentry><refentrytitle>ctdb</refentrytitle>
1699 <manvolnum>7</manvolnum></citerefentry>,
1701 <citerefentry><refentrytitle>ctdb-tunables</refentrytitle>
1702 <manvolnum>7</manvolnum></citerefentry>,
1704 <ulink url="http://ctdb.samba.org/"/>
1705 </para>
1706 </refsect1>
1709 </refentry>