[vlendec/samba-autobuild/.git] / ctdb / doc / ctdb.1.xml

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<!DOCTYPE refentry
        PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<refentry id="ctdb.1">

  <refentryinfo>
    <author>
      <contrib>
        This documentation was written by
        Ronnie Sahlberg,
        Amitay Isaacs,
        Martin Schwenke
      </contrib>
    </author>

    <copyright>
      <year>2007</year>
      <holder>Andrew Tridgell</holder>
      <holder>Ronnie Sahlberg</holder>
    </copyright>
    <legalnotice>
      <para>
        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.
      </para>
      <para>
        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.
      </para>
      <para>
        You should have received a copy of the GNU General Public
        License along with this program; if not, see
        <ulink url="http://www.gnu.org/licenses"/>.
      </para>
    </legalnotice>
  </refentryinfo>

  <refmeta>
    <refentrytitle>ctdb</refentrytitle>
    <manvolnum>1</manvolnum>
    <refmiscinfo class="source">ctdb</refmiscinfo>
    <refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
  </refmeta>

  <refnamediv>
    <refname>ctdb</refname>
    <refpurpose>CTDB management utility</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>ctdb</command>
      <arg rep="repeat"><replaceable>OPTION</replaceable></arg>
      <arg choice="req"><replaceable>COMMAND</replaceable></arg>
      <arg choice="opt"><replaceable>COMMAND-ARGS</replaceable></arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>DESCRIPTION</title>
    <para>
      ctdb is a utility to view and manage a CTDB cluster.
    </para>

    <para>
      The following terms are used when referring to nodes in a
      cluster:
      <variablelist>
        <varlistentry>
          <term>PNN</term>
          <listitem>
            <para>
              Physical Node Number.  The physical node number is an
              integer that describes the node in the cluster. The
              first node has physical node number 0.  in a cluster.
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>PNN-LIST</term>
          <listitem>
            <para>
              This is either a single PNN, a comma-separate list of PNNs
              or "all".
            </para>
          </listitem>
        </varlistentry>
      </variablelist>
    </para>

    <para>
      Commands that reference a database use the following terms:
      <variablelist>
        <varlistentry>
          <term>DB</term>
          <listitem>
            <para>
              This is either a database name, such as
              <filename>locking.tdb</filename> or a database ID such
              as "0x42fe72c5".
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>DB-LIST</term>
          <listitem>
            <para>
              A space separated list of at least one
              <parameter>DB</parameter>.
            </para>
          </listitem>
        </varlistentry>
      </variablelist>
    </para>
  </refsect1>

  <refsect1>
    <title>OPTIONS</title>

    <variablelist>
      <varlistentry><term>-n <parameter>PNN</parameter></term>
      <listitem>
        <para>
          The node specified by PNN should be queried for the
          requested information.  Default is to query the daemon
          running on the local host.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-Y</term>
      <listitem>
        <para>
          Produce output in machine readable form for easier parsing
          by scripts. This uses a field delimiter of ':'.  Not all
          commands support this option.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-x <parameter>SEPARATOR</parameter></term>
      <listitem>
        <para>
          Use SEPARATOR to delimit fields in machine readable output.
          This implies -Y.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-X</term>
      <listitem>
        <para>
          Produce output in machine readable form for easier parsing
          by scripts. This uses a field delimiter of '|'.  Not all
          commands support this option.
        </para>
        <para>
          This is equivalent to "-x|" and avoids some shell quoting
          issues.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-t <parameter>TIMEOUT</parameter></term>
      <listitem>
        <para>
          Indicates that ctdb should wait up to TIMEOUT seconds for
          a response to most commands sent to the CTDB daemon.  The
          default is 10 seconds.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-T <parameter>TIMELIMIT</parameter></term>
      <listitem>
        <para>
          Indicates that TIMELIMIT is the maximum run time (in
          seconds) for the ctdb command.  When TIMELIMIT is exceeded
          the ctdb command will terminate with an error.  The default
          is 120 seconds.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-? --help</term>
      <listitem>
        <para>
          Print some help text to the screen.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>--usage</term>
      <listitem>
        <para>
          Print useage information to the screen.
        </para>
      </listitem>
      </varlistentry>

      <varlistentry><term>-d --debug=<parameter>DEBUGLEVEL</parameter></term>
      <listitem>
        <para>
          Change the debug level for the command. Default is NOTICE.
        </para>
      </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>


  <refsect1>
    <title>ADMINISTRATIVE COMMANDS</title>
    <para>
      These are commands used to monitor and administer a CTDB cluster.
    </para>

    <refsect2>
      <title>pnn</title>
      <para>
        This command displays the PNN of the current node.
      </para>
    </refsect2>

    <refsect2>
      <title>status</title>
      <para>
        This command shows the current status of all CTDB nodes based
        on information from the queried node.
      </para>

      <para>
        Note: If the the queried node is INACTIVE then the status
        might not be current.
      </para>

      <refsect3>
        <title>Node status</title>
        <para>
          This includes the number of physical nodes and the status of
          each node.  See <citerefentry><refentrytitle>ctdb</refentrytitle>
          <manvolnum>7</manvolnum></citerefentry> for information
          about node states.
        </para>
      </refsect3>

      <refsect3>
        <title>Generation</title>
        <para>
          The generation id is a number that indicates the current generation 
          of a cluster instance. Each time a cluster goes through a 
          reconfiguration or a recovery its generation id will be changed.
        </para>
        <para>
          This number does not have any particular meaning other than
          to keep track of when a cluster has gone through a
          recovery. It is a random number that represents the current
          instance of a ctdb cluster and its databases.  The CTDB
          daemon uses this number internally to be able to tell when
          commands to operate on the cluster and the databases was
          issued in a different generation of the cluster, to ensure
          that commands that operate on the databases will not survive
          across a cluster database recovery.  After a recovery, all
          old outstanding commands will automatically become invalid.
        </para>
        <para>
          Sometimes this number will be shown as "INVALID". This only means that
          the ctdbd daemon has started but it has not yet merged with the cluster through a recovery.
          All nodes start with generation "INVALID" and are not assigned a real
          generation id until they have successfully been merged with a cluster
          through a recovery.
        </para>
      </refsect3>

      <refsect3>
        <title>Virtual Node Number (VNN) map</title>
        <para>
          Consists of the number of virtual nodes and mapping from
          virtual node numbers to physical node numbers.  Only nodes
          that are participating in the VNN map can become lmaster for
          database records.
        </para>
      </refsect3>

      <refsect3>
        <title>Recovery mode</title>
        <para>
          This is the current recovery mode of the cluster. There are two possible modes:
        </para>
        <para>
          NORMAL - The cluster is fully operational.
        </para>
        <para>
          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.
        </para>
        <para>
          Once the recovery master detects an inconsistency, for example a node 
          becomes disconnected/connected, the recovery daemon will trigger a 
          cluster recovery process, where all databases are remerged across the
          cluster. When this process starts, the recovery master will first
          "freeze" all databases to prevent applications such as samba from 
          accessing the databases and it will also mark the recovery mode as
          RECOVERY.
        </para>
        <para>
          When the CTDB daemon starts up, it will start in RECOVERY
          mode.  Once the node has been merged into a cluster and all
          databases have been recovered, the node mode will change into
          NORMAL mode and the databases will be "thawed", allowing samba
          to access the databases again.
        </para>
      </refsect3>
      <refsect3>
        <title>Recovery master</title>
        <para>
          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.
        </para>
        <para>
          Only one node at a time can be the designated recovery master. Which
          node is designated the recovery master is decided by an election
          process in the recovery daemons running on each node.
        </para>
      </refsect3>

      <refsect3>
        <title>Example</title>
        <screen>
# ctdb status
Number of nodes:4
pnn:0 192.168.2.200       OK (THIS NODE)
pnn:1 192.168.2.201       OK
pnn:2 192.168.2.202       OK
pnn:3 192.168.2.203       OK
Generation:1362079228
Size:4
hash:0 lmaster:0
hash:1 lmaster:1
hash:2 lmaster:2
hash:3 lmaster:3
Recovery mode:NORMAL (0)
Recovery master:0
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>nodestatus <optional><parameter>PNN-LIST</parameter></optional></title>
      <para>
        This command is similar to the <command>status</command>
        command.  It displays the "node status" subset of output.  The
        main differences are:
      </para>

      <itemizedlist>
        <listitem>
          <para>
            The exit code is the bitwise-OR of the flags for each
            specified node, while <command>ctdb status</command> exits
            with 0 if it was able to retrieve status for all nodes.
          </para>
        </listitem>

        <listitem>
          <para>
            <command>ctdb status</command> provides status information
            for all nodes.  <command>ctdb nodestatus</command>
            defaults to providing status for only the current node.
            If PNN-LIST is provided then status is given for
            the indicated node(s).
          </para>
        </listitem>
      </itemizedlist>

      <para>
        A common invocation in scripts is <command>ctdb nodestatus
        all</command> to check whether all nodes in a cluster are
        healthy.
      </para>

      <refsect3>
        <title>Example</title>
        <screen>
# ctdb nodestatus
pnn:0 10.0.0.30        OK (THIS NODE)

# ctdb nodestatus all
Number of nodes:2
pnn:0 10.0.0.30        OK (THIS NODE)
pnn:1 10.0.0.31        OK
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>recmaster</title>
      <para>
        This command shows the pnn of the node which is currently the recmaster.
      </para>

      <para>
        Note: If the the queried node is INACTIVE then the status
        might not be current.
      </para>
    </refsect2>

    <refsect2>
      <title>uptime</title>
      <para>
        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.
      </para>

      <refsect3>
        <title>Example</title>
        <screen>
# ctdb uptime
Current time of node          :                Thu Oct 29 10:38:54 2009
Ctdbd start time              : (000 16:54:28) Wed Oct 28 17:44:26 2009
Time of last recovery/failover: (000 16:53:31) Wed Oct 28 17:45:23 2009
Duration of last recovery/failover: 2.248552 seconds
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>listnodes</title>
      <para>
        This command shows lists the ip addresses of all the nodes in the cluster.
      </para>

      <refsect3>
        <title>Example</title>
        <screen>
# ctdb listnodes
192.168.2.200
192.168.2.201
192.168.2.202
192.168.2.203
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>natgw {master|list|status}</title>
      <para>
        This command shows different aspects of NAT gateway status.
        For an overview of CTDB's NAT gateway functionality please see
        the <citetitle>NAT GATEWAY</citetitle> section in
        <citerefentry><refentrytitle>ctdb</refentrytitle>
        <manvolnum>7</manvolnum></citerefentry>.
      </para>

      <variablelist>
        <varlistentry>
          <term>master</term>
          <listitem>
            <para>
              Show the PNN and private IP address of the current NAT
              gateway master node.
            </para>
            <para>
              Example output:
            </para>
            <screen>
1 192.168.2.201
            </screen>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>list</term>
          <listitem>
            <para>
              List the private IP addresses of nodes in the current
              NAT gateway group, annotating the master node.
            </para>
            <para>
              Example output:
            </para>
            <screen>
192.168.2.200
192.168.2.201   MASTER
192.168.2.202
192.168.2.203
            </screen>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>status</term>
          <listitem>
            <para>
              List the nodes in the current NAT gateway group and
              their status.
            </para>
            <para>
              Example output:
            </para>
            <screen>
pnn:0 192.168.2.200       UNHEALTHY (THIS NODE)
pnn:1 192.168.2.201       OK
pnn:2 192.168.2.202       OK
pnn:3 192.168.2.203       OK
            </screen>
          </listitem>
        </varlistentry>
      </variablelist>
    </refsect2>

    <refsect2>
      <title>ping</title>
      <para>
        This command will "ping" specified CTDB nodes in the cluster
        to verify that they are running.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb ping
response from 0 time=0.000054 sec  (3 clients)
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>ifaces</title>
      <para>
        This command will display the list of network interfaces, which could
        host public addresses, along with their status.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb ifaces
Interfaces on node 0
name:eth5 link:up references:2
name:eth4 link:down references:0
name:eth3 link:up references:1
name:eth2 link:up references:1

# ctdb -X ifaces
|Name|LinkStatus|References|
|eth5|1|2|
|eth4|0|0|
|eth3|1|1|
|eth2|1|1|
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>ip</title>
      <para>
        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 all".
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb ip -v
Public IPs on node 0
172.31.91.82 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
172.31.91.83 node[0] active[eth3] available[eth2,eth3] configured[eth2,eth3]
172.31.91.84 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
172.31.91.85 node[0] active[eth2] available[eth2,eth3] configured[eth2,eth3]
172.31.92.82 node[1] active[] available[eth5] configured[eth4,eth5]
172.31.92.83 node[0] active[eth5] available[eth5] configured[eth4,eth5]
172.31.92.84 node[1] active[] available[eth5] configured[eth4,eth5]
172.31.92.85 node[0] active[eth5] available[eth5] configured[eth4,eth5]

# ctdb -X ip -v
|Public IP|Node|ActiveInterface|AvailableInterfaces|ConfiguredInterfaces|
|172.31.91.82|1||eth2,eth3|eth2,eth3|
|172.31.91.83|0|eth3|eth2,eth3|eth2,eth3|
|172.31.91.84|1||eth2,eth3|eth2,eth3|
|172.31.91.85|0|eth2|eth2,eth3|eth2,eth3|
|172.31.92.82|1||eth5|eth4,eth5|
|172.31.92.83|0|eth5|eth5|eth4,eth5|
|172.31.92.84|1||eth5|eth4,eth5|
|172.31.92.85|0|eth5|eth5|eth4,eth5|
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>ipinfo <parameter>IP</parameter></title>
      <para>
        This command will display details about the specified public addresses.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb ipinfo 172.31.92.85
Public IP[172.31.92.85] info on node 0
IP:172.31.92.85
CurrentNode:0
NumInterfaces:2
Interface[1]: Name:eth4 Link:down References:0
Interface[2]: Name:eth5 Link:up References:2 (active)
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>event run|status|script list|script enable|script disable</title>
      <para>
        This command is used to control event daemon and to inspect
        status of various events.
      </para>

      <variablelist>
        <varlistentry>
          <term>run <parameter>EVENT</parameter> <parameter>TIMEOUT</parameter> <optional><parameter>ARGUMENTS</parameter></optional> </term>
          <listitem>
            <para>
             This command can be used to manually run specified EVENT
             with optional ARGUMENTS.  The event will be allowed to run
             a maximum of TIMEOUT seconds.  If TIMEOUT is 0, then there
             is no time limit for running the event.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>status <optional><parameter>EVENT</parameter></optional> <optional>lastrun|lastpass|lastfail</optional></term>
          <listitem>
            <para>
              This command displays the last execution status of the
              specified EVENT.  If no event is specified, then the status
              of last executed monitor event will be displayed.
            </para>
            <para>
              To see the last successful execution of the event, lastpass
              can be specified. Similarly lastfail can be specified
              to see the last unsuccessful execution of the event.
              The optional lastrun can be specified to query the last
              execution of the event.
            </para>
            <para>
              The command will terminate with the exit status
              corresponding to the overall status of event that is
              displayed.  If lastpass is specified, then the command will
              always terminate with 0.  If lastfail is specified then the
              command will always terminate with non-zero exit status.
              If lastrun is specified, then the command will terminate
              with 0 or not depending on if the last execution of the
              event was successful or not.
            </para>
            <para>
              The output is the list of event scripts executed.
              Each line shows the name, status, duration and start time
              for each script.
            </para>
            <para>
              Example output:
            </para>
            <screen>
00.ctdb              OK         0.014 Sat Dec 17 19:39:11 2016
01.reclock           OK         0.013 Sat Dec 17 19:39:11 2016
05.system            OK         0.029 Sat Dec 17 19:39:11 2016
06.nfs               OK         0.014 Sat Dec 17 19:39:11 2016
10.interface         OK         0.037 Sat Dec 17 19:39:11 2016
11.natgw             OK         0.011 Sat Dec 17 19:39:11 2016
11.routing           OK         0.007 Sat Dec 17 19:39:11 2016
13.per_ip_routing    OK         0.007 Sat Dec 17 19:39:11 2016
20.multipathd        OK         0.007 Sat Dec 17 19:39:11 2016
31.clamd             OK         0.007 Sat Dec 17 19:39:11 2016
40.vsftpd            OK         0.013 Sat Dec 17 19:39:11 2016
41.httpd             OK         0.018 Sat Dec 17 19:39:11 2016
49.winbind           OK         0.023 Sat Dec 17 19:39:11 2016
50.samba             OK         0.100 Sat Dec 17 19:39:12 2016
60.nfs               OK         0.376 Sat Dec 17 19:39:12 2016
70.iscsi             OK         0.009 Sat Dec 17 19:39:12 2016
91.lvs               OK         0.007 Sat Dec 17 19:39:12 2016
99.timeout           OK         0.007 Sat Dec 17 19:39:12 2016
            </screen>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>script list</term>
          <listitem>
            <para>
              List the available event scripts.
            </para>
            <para>
              Example output:
            </para>
            <screen>
00.ctdb             
01.reclock          
05.system           
06.nfs              
10.interface        
11.natgw            
11.routing          
13.per_ip_routing   
20.multipathd       
31.clamd            
40.vsftpd           
41.httpd            
49.winbind          
50.samba            
60.nfs              
70.iscsi            
91.lvs              
99.timeout          
            </screen>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>script enable <parameter>SCRIPT</parameter></term>
          <listitem>
            <para>
              Enable the specified event SCRIPT.  Only enabled scripts will be
              executed when running any event.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>script disable <parameter>SCRIPT</parameter></term>
          <listitem>
            <para>
              Disable the specified event SCRIPT.  This will prevent the script
              from executing when running any event.
            </para>
          </listitem>
        </varlistentry>
      </variablelist>
    </refsect2>

    <refsect2>
      <title>scriptstatus</title>
      <para>
        This command displays which event 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.
      </para>
      <para>
        This command is deprecated.  It's provided for backward
        compatibility.  In place of <command>ctdb scriptstatus</command>,
        use <command>ctdb event status</command>.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb scriptstatus
00.ctdb              OK         0.011 Sat Dec 17 19:40:46 2016
01.reclock           OK         0.010 Sat Dec 17 19:40:46 2016
05.system            OK         0.030 Sat Dec 17 19:40:46 2016
06.nfs               OK         0.014 Sat Dec 17 19:40:46 2016
10.interface         OK         0.041 Sat Dec 17 19:40:46 2016
11.natgw             OK         0.008 Sat Dec 17 19:40:46 2016
11.routing           OK         0.007 Sat Dec 17 19:40:46 2016
13.per_ip_routing    OK         0.007 Sat Dec 17 19:40:46 2016
20.multipathd        OK         0.007 Sat Dec 17 19:40:46 2016
31.clamd             OK         0.007 Sat Dec 17 19:40:46 2016
40.vsftpd            OK         0.013 Sat Dec 17 19:40:46 2016
41.httpd             OK         0.015 Sat Dec 17 19:40:46 2016
49.winbind           OK         0.022 Sat Dec 17 19:40:46 2016
50.samba             ERROR      0.077 Sat Dec 17 19:40:46 2016
  OUTPUT: ERROR: samba tcp port 445 is not responding
      </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>listvars</title>
      <para>
        List all tuneable variables, except the values of the obsolete tunables
        like VacuumMinInterval. The obsolete tunables can be retrieved only
        explicitly with the "ctdb getvar" command.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb listvars
SeqnumInterval          = 1000
ControlTimeout          = 60
TraverseTimeout         = 20
KeepaliveInterval       = 5
KeepaliveLimit          = 5
RecoverTimeout          = 120
RecoverInterval         = 1
ElectionTimeout         = 3
TakeoverTimeout         = 9
MonitorInterval         = 15
TickleUpdateInterval    = 20
EventScriptTimeout      = 30
MonitorTimeoutCount     = 20
RecoveryGracePeriod     = 120
RecoveryBanPeriod       = 300
DatabaseHashSize        = 100001
DatabaseMaxDead         = 5
RerecoveryTimeout       = 10
EnableBans              = 1
NoIPFailback            = 0
DisableIPFailover       = 0
VerboseMemoryNames      = 0
RecdPingTimeout         = 60
RecdFailCount           = 10
LogLatencyMs            = 0
RecLockLatencyMs        = 1000
RecoveryDropAllIPs      = 120
VacuumInterval          = 10
VacuumMaxRunTime        = 120
RepackLimit             = 10000
VacuumLimit             = 5000
VacuumFastPathCount     = 60
MaxQueueDropMsg         = 1000000
AllowUnhealthyDBRead    = 0
StatHistoryInterval     = 1
DeferredAttachTO        = 120
AllowClientDBAttach     = 1
RecoverPDBBySeqNum      = 1
DeferredRebalanceOnNodeAdd = 300
FetchCollapse           = 1
HopcountMakeSticky      = 50
StickyDuration          = 600
StickyPindown           = 200
NoIPTakeover            = 0
DBRecordCountWarn       = 100000
DBRecordSizeWarn        = 10000000
DBSizeWarn              = 100000000
PullDBPreallocation     = 10485760
TDBMutexEnabled         = 1
LockProcessesPerDB      = 200
RecBufferSizeLimit      = 1000000
QueueBufferSize         = 1024
IPAllocAlgorithm        = 2
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>getvar <parameter>NAME</parameter></title>
      <para>
        Get the runtime value of a tuneable variable.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb getvar MonitorInterval
MonitorInterval         = 15
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>setvar <parameter>NAME</parameter> <parameter>VALUE</parameter></title>
      <para>
        Set the runtime value of a tuneable variable.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb setvar MonitorInterval 20
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>lvs {master|list|status}</title>
      <para>
        This command shows different aspects of LVS status.  For an
        overview of CTDB's LVS functionality please see the
        <citetitle>LVS</citetitle> section in
        <citerefentry><refentrytitle>ctdb</refentrytitle>
        <manvolnum>7</manvolnum></citerefentry>.
      </para>

      <variablelist>
        <varlistentry>
          <term>master</term>
          <listitem>
            <para>
              Shows the PNN of the current LVS master node.
            </para>
      <para>
        Example output:
      </para>
      <screen>
2
      </screen>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>list</term>
          <listitem>
            <para>
              Lists the currently usable LVS nodes.
            </para>
      <para>
        Example output:
      </para>
      <screen>
2 10.0.0.13
3 10.0.0.14
      </screen>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term>status</term>
          <listitem>
            <para>
              List the nodes in the current LVS group and their status.
            </para>
      <para>
        Example output:
      </para>
      <screen>
pnn:0 10.0.0.11        UNHEALTHY (THIS NODE)
pnn:1 10.0.0.12        UNHEALTHY
pnn:2 10.0.0.13        OK
pnn:3 10.0.0.14        OK
      </screen>
          </listitem>
        </varlistentry>
      </variablelist>

    </refsect2>


    <refsect2>
      <title>getcapabilities</title>

      <para>
        This command shows the capabilities of the current node.  See
        the <citetitle>CAPABILITIES</citetitle> section in
        <citerefentry><refentrytitle>ctdb</refentrytitle>
        <manvolnum>7</manvolnum></citerefentry> for more details.
      </para>

      <para>
        Example output:
      </para>
      <screen>
RECMASTER: YES
LMASTER: YES
      </screen>

    </refsect2>

    <refsect2>
      <title>statistics</title>
      <para>
        Collect statistics from the CTDB daemon about
        how many calls it has served.  Information about
        various fields in statistics can be found in
        <citerefentry><refentrytitle>ctdb-statistics</refentrytitle>
        <manvolnum>7</manvolnum></citerefentry>.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb statistics
CTDB version 1
Current time of statistics  :                Tue Mar  8 15:18:51 2016
Statistics collected since  : (003 21:31:32) Fri Mar  4 17:47:19 2016
 num_clients                        9
 frozen                             0
 recovering                         0
 num_recoveries                     2
 client_packets_sent          8170534
 client_packets_recv          7166132
 node_packets_sent           16549998
 node_packets_recv            5244418
 keepalive_packets_sent        201969
 keepalive_packets_recv        201969
 node
     req_call                      26
     reply_call                     0
     req_dmaster                    9
     reply_dmaster                 12
     reply_error                    0
     req_message              1339231
     req_control              8177506
     reply_control            6831284
 client
     req_call                      15
     req_message               334809
     req_control              6831308
 timeouts
     call                           0
     control                        0
     traverse                       0
 locks
     num_calls                      8
     num_current                    0
     num_pending                    0
     num_failed                     0
 total_calls                       15
 pending_calls                      0
 childwrite_calls                   0
 pending_childwrite_calls             0
 memory_used                   394879
 max_hop_count                      1
 total_ro_delegations               0
 total_ro_revokes                   0
 hop_count_buckets: 8 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 lock_buckets: 0 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0
 locks_latency      MIN/AVG/MAX     0.010005/0.010418/0.011010 sec out of 8
 reclock_ctdbd      MIN/AVG/MAX     0.002538/0.002538/0.002538 sec out of 1
 reclock_recd       MIN/AVG/MAX     0.000000/0.000000/0.000000 sec out of 0
 call_latency       MIN/AVG/MAX     0.000044/0.002142/0.011702 sec out of 15
 childwrite_latency MIN/AVG/MAX     0.000000/0.000000/0.000000 sec out of 0
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>statisticsreset</title>
      <para>
        This command is used to clear all statistics counters in a node.
      </para>
      <para>
        Example: ctdb statisticsreset
      </para>
    </refsect2>

    <refsect2>
      <title>dbstatistics <parameter>DB</parameter></title>
      <para>
        Display statistics about the database DB.  Information
        about various fields in dbstatistics can be found in
        <citerefentry><refentrytitle>ctdb-statistics</refentrytitle>
        <manvolnum>7</manvolnum></citerefentry>.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb dbstatistics locking.tdb
DB Statistics: locking.tdb
 ro_delegations                     0
 ro_revokes                         0
 locks
     total                      14356
     failed                         0
     current                        0
     pending                        0
 hop_count_buckets: 28087 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0
 lock_buckets: 0 14188 38 76 32 19 3 0 0 0 0 0 0 0 0 0
 locks_latency      MIN/AVG/MAX     0.001066/0.012686/4.202292 sec out of 14356
 vacuum_latency     MIN/AVG/MAX     0.000472/0.002207/15.243570 sec out of 224530
 Num Hot Keys:     1
     Count:8 Key:ff5bd7cb3ee3822edc1f0000000000000000000000000000
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>getreclock</title>
      <para>
        Show details of the recovery lock, if any.
      </para>

      <para>
        Example output:
      </para>
      <screen>
        /clusterfs/.ctdb/recovery.lock
      </screen>

    </refsect2>

    <refsect2>
      <title>getdebug</title>
      <para>
        Get the current debug level for the node. the debug level controls what information is written to the log file.
      </para>
      <para>
        The debug levels are mapped to the corresponding syslog levels.
        When a debug level is set, only those messages at that level and higher
        levels will be printed.
      </para>
      <para>
        The list of debug levels from highest to lowest are :
      </para>
      <para>
        ERROR WARNING NOTICE INFO DEBUG
      </para>
    </refsect2>

    <refsect2>
      <title>setdebug <parameter>DEBUGLEVEL</parameter></title>
      <para>
        Set the debug level of a node. This controls what information will be logged.
      </para>
      <para>
        The debuglevel is one of ERROR WARNING NOTICE INFO DEBUG
      </para>
    </refsect2>

    <refsect2>
      <title>getpid</title>
      <para>
        This command will return the process id of the ctdb daemon.
      </para>
    </refsect2>

    <refsect2>
      <title>disable</title>
      <para>
        This command is used to administratively disable a node in the cluster.
        A disabled node will still participate in the cluster and host
        clustered TDB records but its public ip address has been taken over by
        a different node and it no longer hosts any services.
      </para>
    </refsect2>

    <refsect2>
      <title>enable</title>
      <para>
        Re-enable a node that has been administratively disabled.
      </para>
    </refsect2>

    <refsect2>
      <title>stop</title>
      <para>
        This command is used to administratively STOP a node in the cluster.
        A STOPPED node is connected to the cluster but will not host any
        public ip addresse, nor does it participate in the VNNMAP.
        The difference between a DISABLED node and a STOPPED node is that
        a STOPPED node does not host any parts of the database which means
        that a recovery is required to stop/continue nodes.
      </para>
    </refsect2>

    <refsect2>
      <title>continue</title>
      <para>
        Re-start a node that has been administratively stopped.
      </para>
    </refsect2>

    <refsect2>
      <title>addip <parameter>IPADDR</parameter>/<parameter>mask</parameter> <parameter>IFACE</parameter></title>
      <para>
        This command is used to add a new public ip to a node
        during runtime.  It should be followed by a <command>ctdb
        ipreallocate</command>.  This allows public addresses to be
        added to a cluster without having to restart the ctdb daemons.
      </para>
      <para>
        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.  If you want this change to be
        permanent you must also update the public addresses file manually.
      </para>
    </refsect2>

    <refsect2>
      <title>delip <parameter>IPADDR</parameter></title>
      <para>
        This command flags IPADDR for deletion from a node at runtime.
        It should be followed by a <command>ctdb
        ipreallocate</command>.  If IPADDR is currently hosted by the
        node it is being removed from, this ensures that the IP will
        first be failed over to another node, if possible, and that it
        is then actually removed.
      </para>
      <para>
        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.  If you want this change to
        be permanent you must also update the public addresses file
        manually.
      </para>
    </refsect2>

    <refsect2>
      <title>moveip <parameter>IPADDR</parameter> <parameter>PNN</parameter></title>
      <para>
        This command can be used to manually fail a public ip address to a
        specific node.
      </para>
      <para>
        In order to manually override the "automatic" distribution of public 
        ip addresses that ctdb normally provides, this command only works
        when you have changed the tunables for the daemon to:
      </para>
      <para>
        IPAllocAlgorithm != 0
      </para>
      <para>
        NoIPFailback = 1
      </para>
    </refsect2>

    <refsect2>
      <title>shutdown</title>
      <para>
        This command will shutdown a specific CTDB daemon.
      </para>
    </refsect2>

    <refsect2>
      <title>setlmasterrole on|off</title>
      <para>
        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.
      </para>

      <para>
        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.
      </para>
      <para>
        Once this setting has been enabled/disabled, you need to perform a recovery for it to take effect.
      </para>
      <para>
        See also "ctdb getcapabilities"
      </para>
    </refsect2>

    <refsect2>
      <title>setrecmasterrole on|off</title>
      <para>
        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.
      </para>

      <para>
        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.
      </para>
      <para>
        See also "ctdb getcapabilities"
      </para>
    </refsect2>

    <refsect2>
      <title>reloadnodes</title>
      <para>
        This command is used when adding new nodes, or removing
        existing nodes from an existing cluster.
      </para>
      <para>
        Procedure to add nodes:
      </para>
      <orderedlist>
        <listitem>
          <para>
             To expand an existing cluster, first ensure with
             <command>ctdb status</command> that all nodes are up and
             running and that they are all healthy.  Do not try to
             expand a cluster unless it is completely healthy!
          </para>
        </listitem>
        <listitem>
          <para>
            On all nodes, edit <filename>/usr/local/etc/ctdb/nodes</filename>
            and <emphasis>add the new nodes at the end of this
            file</emphasis>.
          </para>
        </listitem>
        <listitem>
          <para>
            Verify that all the nodes have identical
            <filename>/usr/local/etc/ctdb/nodes</filename> files after adding
            the new nodes.
          </para>
        </listitem>
        <listitem>
          <para>
            Run <command>ctdb reloadnodes</command> to force all nodes
            to reload the nodes file.
          </para>
        </listitem>
        <listitem>
          <para>
            Use <command>ctdb status</command> on all nodes and verify
            that they now show the additional nodes.
          </para>
        </listitem>
        <listitem>
          <para>
            Install and configure the new node and bring it online.
          </para>
        </listitem>
      </orderedlist>
      <para>
        Procedure to remove nodes:
      </para>
      <orderedlist>
        <listitem>
          <para>
            To remove nodes from an existing cluster, first ensure
            with <command>ctdb status</command> that all nodes, except
            the node to be deleted, are up and running and that they
            are all healthy.  Do not try to remove nodes from a
            cluster unless the cluster is completely healthy!
          </para>
        </listitem>
        <listitem>
          <para>
            Shutdown and power off the node to be removed.
          </para>
        </listitem>
        <listitem>
          <para>
            On all other nodes, edit the
            <filename>/usr/local/etc/ctdb/nodes</filename> file and
            <emphasis>comment out</emphasis> the nodes to be removed.
            <emphasis>Do not delete the lines for the deleted
            nodes</emphasis>, just comment them out by adding a '#' at
            the beginning of the lines.
          </para>
        </listitem>
        <listitem>
          <para>
            Run <command>ctdb reloadnodes</command> to force all nodes
            to reload the nodes file.
          </para>
        </listitem>
        <listitem>
          <para>
            Use <command>ctdb status</command> on all nodes and verify
            that the deleted nodes are no longer listed.
          </para>
        </listitem>
      </orderedlist>

    </refsect2>

    <refsect2>
      <title>
        reloadips
        <optional><parameter>PNN-LIST</parameter></optional>
      </title>
      <para>
        This command reloads the public addresses configuration file
        on the specified nodes.  When it completes addresses will be
        reconfigured and reassigned across the cluster as necessary.
      </para>

      <para>
        This command is currently unable to make changes to the
        netmask or interfaces associated with existing addresses.
        Such changes must be made in 2 steps by deleting addresses in
        question and re-adding then.  Unfortunately this will disrupt
        connections to the changed addresses.
      </para>
    </refsect2>

    <refsect2>
      <title>getdbmap</title>
      <para>
        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.  Some database are flagged as REPLICATED,
        this means that the data in that database is replicated across all
        the nodes.  But the data will not remain across reboots.  This
        type of database is used by CTDB to store it's internal state.
      </para>
      <para>
        If a PERSISTENT database is not in a healthy state the database
        is flagged as UNHEALTHY. If there's at least one completely
        healthy node running in the cluster, it's possible that the
        content is restored by a recovery run automaticly. Otherwise an
        administrator needs to analyze the problem.
      </para>
      <para>
        See also "ctdb getdbstatus", "ctdb backupdb", "ctdb restoredb",
        "ctdb dumpbackup", "ctdb wipedb", "ctdb setvar AllowUnhealthyDBRead 1"
        and (if samba or tdb-utils are installed) "tdbtool check".
      </para>
      <para>
        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.
      </para>

      <refsect3>
        <title>Example</title>
        <screen>
# ctdb getdbmap
Number of databases:10
dbid:0x435d3410 name:notify.tdb path:/usr/local/var/lib/ctdb/notify.tdb.0
dbid:0x42fe72c5 name:locking.tdb path:/usr/local/var/lib/ctdb/locking.tdb.0
dbid:0x1421fb78 name:brlock.tdb path:/usr/local/var/lib/ctdb/brlock.tdb.0
dbid:0x17055d90 name:connections.tdb path:/usr/local/var/lib/ctdb/connections.tdb.0
dbid:0xc0bdde6a name:sessionid.tdb path:/usr/local/var/lib/ctdb/sessionid.tdb.0
dbid:0x122224da name:test.tdb path:/usr/local/var/lib/ctdb/test.tdb.0
dbid:0x2672a57f name:idmap2.tdb path:/usr/local/var/lib/ctdb/persistent/idmap2.tdb.0 PERSISTENT
dbid:0xb775fff6 name:secrets.tdb path:/usr/local/var/lib/ctdb/persistent/secrets.tdb.0 PERSISTENT
dbid:0xe98e08b6 name:group_mapping.tdb path:/usr/local/var/lib/ctdb/persistent/group_mapping.tdb.0 PERSISTENT
dbid:0x7bbbd26c name:passdb.tdb path:/usr/local/var/lib/ctdb/persistent/passdb.tdb.0 PERSISTENT

# ctdb getdbmap  # example for unhealthy database
Number of databases:1
dbid:0xb775fff6 name:secrets.tdb path:/usr/local/var/lib/ctdb/persistent/secrets.tdb.0 PERSISTENT UNHEALTHY

# ctdb -X getdbmap
|ID|Name|Path|Persistent|Unhealthy|
|0x7bbbd26c|passdb.tdb|/usr/local/var/lib/ctdb/persistent/passdb.tdb.0|1|0|
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>
        backupdb
        <parameter>DB</parameter>
        <parameter>FILE</parameter>
      </title>
      <para>
        Copy the contents of database DB to FILE.  FILE can later be
        read back using <command>restoredb</command>.  This is mainly
        useful for backing up persistent databases such as
        <filename>secrets.tdb</filename> and similar.
      </para>
    </refsect2>

    <refsect2>
      <title>
        restoredb
        <parameter>FILE</parameter>
        <optional><parameter>DB</parameter></optional>
      </title>
      <para>
        This command restores a persistent database that was
        previously backed up using backupdb.  By default the data will
        be restored back into the same database as it was created
        from. By specifying dbname you can restore the data into a
        different database.
      </para>
    </refsect2>

    <refsect2>
      <title>setdbreadonly <parameter>DB</parameter></title>
      <para>
        This command will enable the read-only record support for a
        database.  This is an experimental feature to improve
        performance for contended records primarily in locking.tdb and
        brlock.tdb.  When enabling this feature you must set it on all
        nodes in the cluster.
      </para>
    </refsect2>

    <refsect2>
      <title>setdbsticky <parameter>DB</parameter></title>
      <para>
        This command will enable the sticky record support for the
        specified database.  This is an experimental feature to
        improve performance for contended records primarily in
        locking.tdb and brlock.tdb.  When enabling this feature you
        must set it on all nodes in the cluster.
      </para>
    </refsect2>

  </refsect1>

  <refsect1>
    <title>INTERNAL COMMANDS</title>

    <para>
      Internal commands are used by CTDB's scripts and are not
      required for managing a CTDB cluster.  Their parameters and
      behaviour are subject to change.
    </para>

    <refsect2>
      <title>gettickles <parameter>IPADDR</parameter></title>
      <para>
        Show TCP connections that are registered with CTDB to be
        "tickled" if there is a failover.
      </para>
    </refsect2>

    <refsect2>
      <title>gratarp <parameter>IPADDR</parameter> <parameter>INTERFACE</parameter></title>
      <para>
        Send out a gratuitous ARP for the specified interface through
        the specified interface. This command is mainly used by the
        ctdb eventscripts.
      </para>
    </refsect2>

    <refsect2>
      <title>
        pdelete <parameter>DB</parameter> <parameter>KEY</parameter>
      </title>
      <para>
        Delete KEY from DB.
      </para>
    </refsect2>

    <refsect2>
      <title>
        pfetch <parameter>DB</parameter> <parameter>KEY</parameter>
      </title>
      <para>
        Print the value associated with KEY in DB.
      </para>
    </refsect2>

    <refsect2>
      <title>
        pstore
        <parameter>DB</parameter>
        <parameter>KEY</parameter>
        <parameter>FILE</parameter>
      </title>
      <para>
        Store KEY in DB with contents of FILE as the associated value.
      </para>
    </refsect2>

    <refsect2>
      <title>
        ptrans
        <parameter>DB</parameter>
        <optional><parameter>FILE</parameter></optional>
      </title>
      <para>
        Read a list of key-value pairs, one per line from FILE, and
        store them in DB using a single transaction.  An empty value
        is equivalent to deleting the given key.
      </para>
      <para>
        The key and value should be separated by spaces or tabs. Each
        key/value should be a printable string enclosed in
        double-quotes.
      </para>
    </refsect2>

    <refsect2>
      <title>runstate [setup|first_recovery|startup|running]</title>
      <para>
        Print the runstate of the specified node.  Runstates are used
        to serialise important state transitions in CTDB, particularly
        during startup.
      </para>
      <para>
        If one or more optional runstate arguments are specified then
        the node must be in one of these runstates for the command to
        succeed.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb runstate
RUNNING
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>setifacelink <parameter>IFACE</parameter> up|down</title>
      <para>
        Set the internal state of network interface IFACE.  This is
        typically used in the <filename>10.interface</filename> script
        in the "monitor" event.
      </para>
      <para>
        Example: ctdb setifacelink eth0 up
      </para>
    </refsect2>

    <refsect2>
      <title>tickle</title>
      <para>
        Read a list of TCP connections, one per line, from standard
        input and send a TCP tickle to the source host for each
        connection.  A connection is specified as:
      </para>
      <synopsis>
        <parameter>SRC-IPADDR</parameter>:<parameter>SRC-PORT</parameter> <parameter>DST-IPADDR</parameter>:<parameter>DST-PORT</parameter>
      </synopsis>
      <para>
        A single connection can be specified on the command-line
        rather than on standard input.
      </para>
      <para>
        A TCP tickle is a TCP ACK packet with an invalid sequence and
        acknowledge number and will when received by the source host
        result in it sending an immediate correct ACK back to the
        other end.
      </para>
      <para>
        TCP tickles are useful to "tickle" clients after a IP failover has
        occurred since this will make the client immediately recognize the
        TCP connection has been disrupted and that the client will need
        to reestablish. This greatly speeds up the time it takes for a client
        to detect and reestablish after an IP failover in the ctdb cluster.
      </para>
    </refsect2>

    <refsect2>
      <title>version</title>
      <para>
        Display the CTDB version.
      </para>
    </refsect2>

  </refsect1>

  <refsect1>
    <title>DEBUGGING COMMANDS</title>
    <para>
      These commands are primarily used for CTDB development and testing and
      should not be used for normal administration.
    </para>


    <refsect2>
      <title>OPTIONS</title>

      <variablelist>
        <varlistentry><term>--print-emptyrecords</term>
        <listitem>
          <para>
            This enables printing of empty records when dumping databases
            with the catdb, cattbd and dumpdbbackup commands. Records with
            empty data segment are considered deleted by ctdb and cleaned
            by the vacuuming mechanism, so this switch can come in handy for
            debugging the vacuuming behaviour.
          </para>
        </listitem>
        </varlistentry>

        <varlistentry><term>--print-datasize</term>
        <listitem>
          <para>
            This lets database dumps (catdb, cattdb, dumpdbbackup) print the
            size of the record data instead of dumping the data contents.
          </para>
        </listitem>
        </varlistentry>

        <varlistentry><term>--print-lmaster</term>
        <listitem>
          <para>
            This lets catdb print the lmaster for each record.
          </para>
        </listitem>
        </varlistentry>

        <varlistentry><term>--print-hash</term>
        <listitem>
          <para>
            This lets database dumps (catdb, cattdb, dumpdbbackup) print the
            hash for each record.
          </para>
        </listitem>
        </varlistentry>

        <varlistentry><term>--print-recordflags</term>
        <listitem>
          <para>
            This lets catdb and dumpdbbackup print the
            record flags for each record. Note that cattdb always
            prints the flags.
          </para>
        </listitem>
        </varlistentry>

      </variablelist>
    </refsect2>

    <refsect2>
      <title>process-exists <parameter>PID</parameter> <parameter>[SRVID]</parameter></title>
      <para>
        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.  When the optional SRVID
        argument is specified, the command check if a specific process
        exists on the CTDB host and has registered for specified SRVID.
      </para>
    </refsect2>

    <refsect2>
      <title>getdbstatus <parameter>DB</parameter></title>
      <para>
        This command displays more details about a database.
      </para>
      <refsect3>
        <title>Example</title>
        <screen>
# ctdb getdbstatus test.tdb.0
dbid: 0x122224da
name: test.tdb
path: /usr/local/var/lib/ctdb/test.tdb.0
PERSISTENT: no
HEALTH: OK

# ctdb getdbstatus registry.tdb  # with a corrupted TDB
dbid: 0xf2a58948
name: registry.tdb
path: /usr/local/var/lib/ctdb/persistent/registry.tdb.0
PERSISTENT: yes
HEALTH: NO-HEALTHY-NODES - ERROR - Backup of corrupted TDB in '/usr/local/var/lib/ctdb/persistent/registry.tdb.0.corrupted.20091208091949.0Z'
        </screen>
      </refsect3>
    </refsect2>

    <refsect2>
      <title>catdb <parameter>DB</parameter></title>
      <para>
        Print a dump of the clustered TDB database DB.
      </para>
    </refsect2>

    <refsect2>
      <title>cattdb <parameter>DB</parameter></title>
      <para>
        Print a dump of the contents of the local TDB database DB.
      </para>
    </refsect2>

    <refsect2>
      <title>dumpdbbackup <parameter>FILE</parameter></title>
      <para>
        Print a dump of the contents from database backup FILE,
        similar to <command>catdb</command>.
      </para>
    </refsect2>

    <refsect2>
      <title>wipedb <parameter>DB</parameter></title>
      <para>
        Remove all contents of database DB.
      </para>
    </refsect2>

    <refsect2>
      <title>recover</title>
      <para>
        This command will trigger the recovery daemon to do a cluster
        recovery.
      </para>
    </refsect2>

    <refsect2>
      <title>ipreallocate, sync</title>
      <para>
        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.
      </para>
    </refsect2>

    <refsect2>
      <title>attach <parameter>DBNAME</parameter> [persistent|replicated]</title>
      <para>
        Create a new CTDB database called DBNAME and attach to it on
        all nodes.
      </para>
    </refsect2>

    <refsect2>
      <title>detach <parameter>DB-LIST</parameter></title>
      <para>
        Detach specified non-persistent database(s) from the cluster. This
        command will disconnect specified database(s) on all nodes in
        the cluster.  This command should only be used when none of the
        specified database(s) are in use.
      </para>
      <para>
        All nodes should be active and tunable AllowClientDBAccess should
        be disabled on all nodes before detaching databases.
      </para>
    </refsect2>

    <refsect2>
      <title>dumpmemory</title>
      <para>
        This is a debugging command. This command will make the ctdb
        daemon to write a fill memory allocation map to standard output.
      </para>
    </refsect2>

    <refsect2>
      <title>rddumpmemory</title>
      <para>
        This is a debugging command. This command will dump the talloc memory
        allocation tree for the recovery daemon to standard output.
      </para>
    </refsect2>

    <refsect2>
      <title>ban <parameter>BANTIME</parameter></title>
      <para>
        Administratively ban a node for BANTIME seconds.  The node
        will be unbanned after BANTIME seconds have elapsed.
      </para>
      <para>
        A banned node does not participate in the cluster.  It does
        not host any records for the clustered TDB and does not host
        any public IP addresses.
      </para>
      <para>
        Nodes are automatically banned if they misbehave.  For
        example, a node may be banned if it causes too many cluster
        recoveries.
      </para>
      <para>
        To administratively exclude a node from a cluster use the
        <command>stop</command> command.
      </para>
    </refsect2>

    <refsect2>
      <title>unban</title>
      <para>
        This command is used to unban a node that has either been
        administratively banned using the ban command or has been
        automatically banned.
      </para>
    </refsect2>

  </refsect1>

  <!-- UNDOCUMENTED: stats
       isnotrecmaster addtickle deltickle
       tfetch tstore readkey writekey
       checktcpport getdbseqnum
  -->

  <refsect1>
    <title>SEE ALSO</title>
    <para>
      <citerefentry><refentrytitle>ctdbd</refentrytitle>
      <manvolnum>1</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>onnode</refentrytitle>
      <manvolnum>1</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>ctdb</refentrytitle>
      <manvolnum>7</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>ctdb-statistics</refentrytitle>
      <manvolnum>7</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>ctdb-tunables</refentrytitle>
      <manvolnum>7</manvolnum></citerefentry>,

      <ulink url="http://ctdb.samba.org/"/>
    </para>
  </refsect1>


</refentry>