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a4b8a17b26
the time since the last recovery OR failover (This used to be ctdb commit 22712c577f64ec84851b4addcf4a46c7e99e0662)
582 lines
38 KiB
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582 lines
38 KiB
HTML
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>ctdb</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="ctdb.1"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ctdb — clustered tdb database management utility</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">ctdb [ OPTIONS ] COMMAND ...</code> </p></div><div class="cmdsynopsis"><p><code class="command">ctdb</code> [-n <node>] [-Y] [-t <timeout>] [-T <timelimit>] [-? --help] [--usage] [-d --debug=<INTEGER>] [--socket=<filename>]</p></div></div><div class="refsect1" lang="en"><a name="id2478395"></a><h2>DESCRIPTION</h2><p>
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ctdb is a utility to view and manage a ctdb cluster.
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</p></div><div class="refsect1" lang="en"><a name="id2478405"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-n <pnn></span></dt><dd><p>
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This specifies the physical node number on which to execute the
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command. Default is to run the command on the deamon running on
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the local host.
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</p><p>
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The physical node number is an integer that describes the node in the
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cluster. The first node has physical node number 0.
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</p></dd><dt><span class="term">-Y</span></dt><dd><p>
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Produce output in machine readable form for easier parsing by scripts. Not all commands support this option.
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</p></dd><dt><span class="term">-t <timeout></span></dt><dd><p>
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How long should ctdb wait for the local ctdb daemon to respond to a command before timing out. Default is 3 seconds.
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</p></dd><dt><span class="term">-T <timelimit></span></dt><dd><p>
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A limit on how long the ctdb command will run for before it will
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be aborted. When this timelimit has been exceeded the ctdb command will
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terminate.
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</p></dd><dt><span class="term">-? --help</span></dt><dd><p>
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||
Print some help text to the screen.
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</p></dd><dt><span class="term">--usage</span></dt><dd><p>
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||
Print useage information to the screen.
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||
</p></dd><dt><span class="term">-d --debug=<debuglevel></span></dt><dd><p>
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Change the debug level for the command. Default is 0.
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||
</p></dd><dt><span class="term">--socket=<filename></span></dt><dd><p>
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||
Specify the socketname to use when connecting to the local ctdb
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daemon. The default is /tmp/ctdb.socket .
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</p><p>
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You only need to specify this parameter if you run multiple ctdb
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daemons on the same physical host and thus can not use the default
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name for the domain socket.
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</p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2479674"></a><h2>Administrative Commands</h2><p>
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These are commands used to monitor and administrate a CTDB cluster.
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</p><div class="refsect2" lang="en"><a name="id2479683"></a><h3>pnn</h3><p>
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This command displays the pnn of the current node.
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</p></div><div class="refsect2" lang="en"><a name="id2479693"></a><h3>status</h3><p>
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This command shows the current status of the ctdb node.
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</p><div class="refsect3" lang="en"><a name="id2479702"></a><h4>node status</h4><p>
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Node status reflects the current status of the node. There are five possible states:
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</p><p>
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OK - This node is fully functional.
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</p><p>
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DISCONNECTED - This node could not be connected through the network and is currently not participating in the cluster. If there is a public IP address associated with this node it should have been taken over by a different node. No services are running on this node.
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</p><p>
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DISABLED - This node has been administratively disabled. This node is still functional and participates in the CTDB cluster but its IP addresses have been taken over by a different node and no services are currently being hosted.
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</p><p>
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UNHEALTHY - A service provided by this node is malfunctioning and should be investigated. The CTDB daemon itself is operational and participates in the cluster. Its public IP address has been taken over by a different node and no services are currnetly being hosted. All unhealthy nodes should be investigated and require an administrative action to rectify.
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</p><p>
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BANNED - This node failed too many recovery attempts and has been banned from participating in the cluster for a period of RecoveryBanPeriod seconds. Any public IP address has been taken over by other nodes. This node does not provide any services. All banned nodes should be investigated and require an administrative action to rectify. This node does not perticipate in the CTDB cluster but can still be communicated with. I.e. ctdb commands can be sent to it.
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</p><p>
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STOPPED - A node that is stopped does not host any public ip addresses,
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nor is it part of the VNNMAP. A stopped node can not become LVSMASTER,
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RECMASTER or NATGW.
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This node does not perticipate in the CTDB cluster but can still be
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communicated with. I.e. ctdb commands can be sent to it.
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</p></div><div class="refsect3" lang="en"><a name="id2479763"></a><h4>generation</h4><p>
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The generation id is a number that indicates the current generation
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of a cluster instance. Each time a cluster goes through a
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reconfiguration or a recovery its generation id will be changed.
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</p><p>
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This number does not have any particular meaning other than to keep
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track of when a cluster has gone through a recovery. It is a random
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number that represents the current instance of a ctdb cluster
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and its databases.
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CTDBD uses this number internally to be able to tell when commands
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to operate on the cluster and the databases was issued in a different
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generation of the cluster, to ensure that commands that operate
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on the databases will not survive across a cluster database recovery.
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After a recovery, all old outstanding commands will automatically
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become invalid.
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</p><p>
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Sometimes this number will be shown as "INVALID". This only means that
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the ctdbd daemon has started but it has not yet merged with the cluster through a recovery.
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All nodes start with generation "INVALID" and are not assigned a real
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generation id until they have successfully been merged with a cluster
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through a recovery.
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</p></div><div class="refsect3" lang="en"><a name="id2479798"></a><h4>VNNMAP</h4><p>
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The list of Virtual Node Numbers. This is a list of all nodes that actively participates in the cluster and that share the workload of hosting the Clustered TDB database records.
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Only nodes that are participating in the vnnmap can become lmaster or dmaster for a database record.
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</p></div><div class="refsect3" lang="en"><a name="id2479812"></a><h4>Recovery mode</h4><p>
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This is the current recovery mode of the cluster. There are two possible modes:
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</p><p>
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NORMAL - The cluster is fully operational.
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</p><p>
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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.
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</p><p>
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Once the recovery master detects an inconsistency, for example a node
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becomes disconnected/connected, the recovery daemon will trigger a
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cluster recovery process, where all databases are remerged across the
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cluster. When this process starts, the recovery master will first
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"freeze" all databases to prevent applications such as samba from
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accessing the databases and it will also mark the recovery mode as
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RECOVERY.
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</p><p>
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When CTDBD starts up, it will start in RECOVERY mode.
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Once the node has been merged into a cluster and all databases
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have been recovered, the node mode will change into NORMAL mode
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and the databases will be "thawed", allowing samba to access the
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databases again.
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</p></div><div class="refsect3" lang="en"><a name="id2528501"></a><h4>Recovery master</h4><p>
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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.
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</p><p>
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Only one node at a time can be the designated recovery master. Which
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node is designated the recovery master is decided by an election
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process in the recovery daemons running on each node.
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</p></div><p>
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Example: ctdb status
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</p><p>Example output:</p><pre class="screen">
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Number of nodes:4
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pnn:0 11.1.2.200 OK (THIS NODE)
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pnn:1 11.1.2.201 OK
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pnn:2 11.1.2.202 OK
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pnn:3 11.1.2.203 OK
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Generation:1362079228
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Size:4
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hash:0 lmaster:0
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hash:1 lmaster:1
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hash:2 lmaster:2
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hash:3 lmaster:3
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Recovery mode:NORMAL (0)
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Recovery master:0
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</pre></div><div class="refsect2" lang="en"><a name="id2528538"></a><h3>recmaster</h3><p>
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This command shows the pnn of the node which is currently the recmaster.
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</p></div><div class="refsect2" lang="en"><a name="id2528549"></a><h3>uptime</h3><p>
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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.
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</p><p>
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Example: ctdb uptime
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</p><p>Example output:</p><pre class="screen">
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Current time of node : Thu Oct 29 10:38:54 2009
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Ctdbd start time : (000 16:54:28) Wed Oct 28 17:44:26 2009
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Time of last recovery/failover: (000 16:53:31) Wed Oct 28 17:45:23 2009
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Duration of last recovery/failover: 2.248552 seconds
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</pre></div><div class="refsect2" lang="en"><a name="id2528580"></a><h3>listnodes</h3><p>
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This command shows lists the ip addresses of all the nodes in the cluster.
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</p><p>
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Example: ctdb listnodes
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</p><p>Example output:</p><pre class="screen">
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10.0.0.71
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10.0.0.72
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10.0.0.73
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10.0.0.74
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</pre></div><div class="refsect2" lang="en"><a name="id2528604"></a><h3>ping</h3><p>
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This command will "ping" all CTDB daemons in the cluster to verify that they are processing commands correctly.
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</p><p>
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Example: ctdb ping
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</p><p>
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Example output:
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</p><pre class="screen">
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response from 0 time=0.000054 sec (3 clients)
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response from 1 time=0.000144 sec (2 clients)
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response from 2 time=0.000105 sec (2 clients)
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response from 3 time=0.000114 sec (2 clients)
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</pre></div><div class="refsect2" lang="en"><a name="id2528630"></a><h3>ip</h3><p>
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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".
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</p><p>
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Example: ctdb ip
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</p><p>
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Example output:
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</p><pre class="screen">
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Number of addresses:4
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12.1.1.1 0
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12.1.1.2 1
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12.1.1.3 2
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12.1.1.4 3
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</pre></div><div class="refsect2" lang="en"><a name="id2528658"></a><h3>scriptstatus</h3><p>
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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.
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</p><p>
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Example: ctdb scriptstatus
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</p><p>
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Example output:
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</p><pre class="screen">
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7 scripts were executed last monitoring cycle
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00.ctdb Status:OK Duration:0.056 Tue Mar 24 18:56:57 2009
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10.interface Status:OK Duration:0.077 Tue Mar 24 18:56:57 2009
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11.natgw Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
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20.multipathd Status:OK Duration:0.038 Tue Mar 24 18:56:57 2009
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31.clamd Status:DISABLED
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40.vsftpd Status:OK Duration:0.045 Tue Mar 24 18:56:57 2009
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41.httpd Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
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50.samba Status:ERROR Duration:0.082 Tue Mar 24 18:56:57 2009
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OUTPUT:ERROR: Samba tcp port 445 is not responding
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</pre></div><div class="refsect2" lang="en"><a name="id2528694"></a><h3>disablescript <script></h3><p>
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This command is used to disable an eventscript.
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</p><p>
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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'.
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</p></div><div class="refsect2" lang="en"><a name="id2528711"></a><h3>enablescript <script></h3><p>
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This command is used to enable an eventscript.
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</p><p>
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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'.
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</p></div><div class="refsect2" lang="en"><a name="id2528727"></a><h3>getvar <name></h3><p>
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Get the runtime value of a tuneable variable.
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</p><p>
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Example: ctdb getvar MaxRedirectCount
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</p><p>
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Example output:
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</p><pre class="screen">
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MaxRedirectCount = 3
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</pre></div><div class="refsect2" lang="en"><a name="id2528750"></a><h3>setvar <name> <value></h3><p>
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Set the runtime value of a tuneable variable.
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</p><p>
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Example: ctdb setvar MaxRedirectCount 5
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</p></div><div class="refsect2" lang="en"><a name="id2528765"></a><h3>listvars</h3><p>
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List all tuneable variables.
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</p><p>
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Example: ctdb listvars
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</p><p>
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Example output:
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</p><pre class="screen">
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MaxRedirectCount = 5
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SeqnumFrequency = 1
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ControlTimeout = 60
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TraverseTimeout = 20
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KeepaliveInterval = 2
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KeepaliveLimit = 3
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MaxLACount = 7
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RecoverTimeout = 5
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RecoverInterval = 1
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ElectionTimeout = 3
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TakeoverTimeout = 5
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MonitorInterval = 15
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EventScriptTimeout = 20
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RecoveryGracePeriod = 60
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RecoveryBanPeriod = 300
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</pre></div><div class="refsect2" lang="en"><a name="id2528793"></a><h3>lvsmaster</h3><p>
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This command shows which node is currently the LVSMASTER. The
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LVSMASTER is the node in the cluster which drives the LVS system and
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which receives all incoming traffic from clients.
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</p><p>
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LVS is the mode where the entire CTDB/Samba cluster uses a single
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ip address for the entire cluster. In this mode all clients connect to
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one specific node which will then multiplex/loadbalance the clients
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evenly onto the other nodes in the cluster. This is an alternative to using
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public ip addresses. See the manpage for ctdbd for more information
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about LVS.
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</p></div><div class="refsect2" lang="en"><a name="id2528815"></a><h3>lvs</h3><p>
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This command shows which nodes in the cluster are currently active in the
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LVS configuration. I.e. which nodes we are currently loadbalancing
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the single ip address across.
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</p><p>
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LVS will by default only loadbalance across those nodes that are both
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LVS capable and also HEALTHY. Except if all nodes are UNHEALTHY in which
|
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case LVS will loadbalance across all UNHEALTHY nodes as well.
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LVS will never use nodes that are DISCONNECTED, STOPPED, BANNED or
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DISABLED.
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</p><p>
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Example output:
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</p><pre class="screen">
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2:10.0.0.13
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3:10.0.0.14
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</pre></div><div class="refsect2" lang="en"><a name="id2528845"></a><h3>getcapabilities</h3><p>
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This command shows the capabilities of the current node.
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Please see manpage for ctdbd for a full list of all capabilities and
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more detailed description.
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</p><p>
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RECMASTER and LMASTER capabilities are primarily used when CTDBD
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is used to create a cluster spanning across WAN links. In which case
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ctdbd acts as a WAN accelerator.
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</p><p>
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LVS capabile means that the node is participating in LVS, a mode
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where the entire CTDB cluster uses one single ip address for the
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entire cluster instead of using public ip address failover.
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This is an alternative to using a loadbalancing layer-4 switch.
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</p><p>
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Example output:
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</p><pre class="screen">
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RECMASTER: YES
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LMASTER: YES
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LVS: NO
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</pre></div><div class="refsect2" lang="en"><a name="id2528881"></a><h3>statistics</h3><p>
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Collect statistics from the CTDB daemon about how many calls it has served.
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</p><p>
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Example: ctdb statistics
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</p><p>
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Example output:
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</p><pre class="screen">
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CTDB version 1
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num_clients 3
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frozen 0
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recovering 0
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client_packets_sent 360489
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||
client_packets_recv 360466
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||
node_packets_sent 480931
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node_packets_recv 240120
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keepalive_packets_sent 4
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keepalive_packets_recv 3
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node
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req_call 2
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reply_call 2
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req_dmaster 0
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||
reply_dmaster 0
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reply_error 0
|
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req_message 42
|
||
req_control 120408
|
||
reply_control 360439
|
||
client
|
||
req_call 2
|
||
req_message 24
|
||
req_control 360440
|
||
timeouts
|
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call 0
|
||
control 0
|
||
traverse 0
|
||
total_calls 2
|
||
pending_calls 0
|
||
lockwait_calls 0
|
||
pending_lockwait_calls 0
|
||
memory_used 5040
|
||
max_hop_count 0
|
||
max_call_latency 4.948321 sec
|
||
max_lockwait_latency 0.000000 sec
|
||
</pre></div><div class="refsect2" lang="en"><a name="id2528925"></a><h3>statisticsreset</h3><p>
|
||
This command is used to clear all statistics counters in a node.
|
||
</p><p>
|
||
Example: ctdb statisticsreset
|
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</p></div><div class="refsect2" lang="en"><a name="id2528939"></a><h3>getreclock</h3><p>
|
||
This command is used to show the filename of the reclock file that is used.
|
||
</p><p>
|
||
Example output:
|
||
</p><pre class="screen">
|
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Reclock file:/gpfs/.ctdb/shared
|
||
</pre></div><div class="refsect2" lang="en"><a name="id2528959"></a><h3>setreclock [filename]</h3><p>
|
||
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".
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2528985"></a><h3>getdebug</h3><p>
|
||
Get the current debug level for the node. the debug level controls what information is written to the log file.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
The list of debug levels from highest to lowest are :
|
||
</p><p>
|
||
EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529011"></a><h3>setdebug <debuglevel></h3><p>
|
||
Set the debug level of a node. This controls what information will be logged.
|
||
</p><p>
|
||
The debuglevel is one of EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529027"></a><h3>getpid</h3><p>
|
||
This command will return the process id of the ctdb daemon.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529037"></a><h3>disable</h3><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529051"></a><h3>enable</h3><p>
|
||
Re-enable a node that has been administratively disabled.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529061"></a><h3>stop</h3><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529076"></a><h3>continue</h3><p>
|
||
Re-start a node that has been administratively stopped.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529087"></a><h3>addip <public_ip/mask> <iface></h3><p>
|
||
This command is used to add a new public ip to a node during runtime.
|
||
This allows public addresses to be added to a cluster without having
|
||
to restart the ctdb daemons.
|
||
</p><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529107"></a><h3>delip <public_ip></h3><p>
|
||
This command is used to remove a public ip from a node during runtime.
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529132"></a><h3>moveip <public_ip> <node></h3><p>
|
||
This command can be used to manually fail a public ip address to a
|
||
specific node.
|
||
</p><p>
|
||
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:
|
||
</p><p>
|
||
DeterministicIPs = 0
|
||
</p><p>
|
||
NoIPFailback = 1
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529157"></a><h3>shutdown</h3><p>
|
||
This command will shutdown a specific CTDB daemon.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529167"></a><h3>recover</h3><p>
|
||
This command will trigger the recovery daemon to do a cluster
|
||
recovery.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529178"></a><h3>ipreallocate</h3><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529193"></a><h3>setlmasterrole <on|off></h3><p>
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
Once this setting has been enabled/disabled, you need to perform a recovery for it to take effect.
|
||
</p><p>
|
||
See also "ctdb getcapabilities"
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529222"></a><h3>setrecmasterrole <on|off></h3><p>
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
See also "ctdb getcapabilities"
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529249"></a><h3>killtcp <srcip:port> <dstip:port></h3><p>
|
||
This command will kill the specified TCP connection by issuing a
|
||
TCP RST to the srcip:port endpoint. This is a command used by the
|
||
ctdb eventscripts.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529261"></a><h3>gratiousarp <ip> <interface></h3><p>
|
||
This command will send out a gratious arp for the specified interface
|
||
through the specified interface. This command is mainly used by the
|
||
ctdb eventscripts.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529274"></a><h3>reloadnodes</h3><p>
|
||
This command is used when adding new nodes, or removing existing nodes from an existing cluster.
|
||
</p><p>
|
||
Procedure to add a node:
|
||
</p><p>
|
||
1, To expand an existing cluster, first ensure with 'ctdb status' 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!
|
||
</p><p>
|
||
2, On all nodes, edit /etc/ctdb/nodes and add the new node as the last
|
||
entry to the file. The new node MUST be added to the end of this file!
|
||
</p><p>
|
||
3, Verify that all the nodes have identical /etc/ctdb/nodes files after you edited them and added the new node!
|
||
</p><p>
|
||
4, Run 'ctdb reloadnodes' to force all nodes to reload the nodesfile.
|
||
</p><p>
|
||
5, Use 'ctdb status' on all nodes and verify that they now show the additional node.
|
||
</p><p>
|
||
6, Install and configure the new node and bring it online.
|
||
</p><p>
|
||
Procedure to remove a node:
|
||
</p><p>
|
||
1, To remove a node from an existing cluster, first ensure with 'ctdb status' that
|
||
all nodes, except the node to be deleted, are up and running and that they are all healthy.
|
||
Do not try to remove a node from a cluster unless the cluster is completely healthy!
|
||
</p><p>
|
||
2, Shutdown and poerwoff the node to be removed.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
4, Run 'ctdb reloadnodes' to force all nodes to reload the nodesfile.
|
||
</p><p>
|
||
5, Use 'ctdb status' on all nodes and verify that the deleted node no longer shows up in the list..
|
||
</p><p>
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529357"></a><h3>tickle <srcip:port> <dstip:port></h3><p>
|
||
This command will will send a TCP tickle to the source host for the
|
||
specified TCP connection.
|
||
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.
|
||
</p><p>
|
||
TCP tickles are useful to "tickle" clients after a IP failover has
|
||
occured 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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529382"></a><h3>gettickles <ip></h3><p>
|
||
This command is used to show which TCP connections are registered with
|
||
CTDB to be "tickled" if there is a failover.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529394"></a><h3>repack [max_freelist]</h3><p>
|
||
Over time, when records are created and deleted in a TDB, the TDB list of free space will become fragmented. This can lead to a slowdown in accessing TDB records.
|
||
This command is used to defragment a TDB database and pruning the freelist.
|
||
</p><p>
|
||
If [max_freelist] is specified, then a database will only be repacked if it has more than this number of entries in the freelist.
|
||
</p><p>
|
||
During repacking of the database, the entire TDB database will be locked to prevent writes. If samba tries to write to a record in the database during a repack operation, samba will block until the repacking has completed.
|
||
</p><p>
|
||
This command can be disruptive and can cause samba to block for the duration of the repack operation. In general, a repack operation will take less than one second to complete.
|
||
</p><p>
|
||
A repack operation will only defragment the local TDB copy of the CTDB database. You need to run this command on all of the nodes to repack a CTDB database completely.
|
||
</p><p>
|
||
Example: ctdb repack 1000
|
||
</p><p>
|
||
By default, this operation is issued from the 00.ctdb event script every 5 minutes.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529440"></a><h3>vacuum [max_records]</h3><p>
|
||
Over time CTDB databases will fill up with empty deleted records which will lead to a progressive slow down of CTDB database access.
|
||
This command is used to prune all databases and delete all empty records from the cluster.
|
||
</p><p>
|
||
By default, vacuum will delete all empty records from all databases.
|
||
If [max_records] is specified, the command will only delete the first
|
||
[max_records] empty records for each database.
|
||
</p><p>
|
||
Vacuum only deletes records where the local node is the lmaster.
|
||
To delete all records from the entire cluster you need to run a vacuum from each node.
|
||
|
||
This command is not disruptive. Samba is unaffected and will still be able to read/write records normally while the database is being vacuumed.
|
||
</p><p>
|
||
Example: ctdb vacuum
|
||
</p><p>
|
||
By default, this operation is issued from the 00.ctdb event script every 5 minutes.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529476"></a><h3>backupdb <database> <file></h3><p>
|
||
This command can be used to copy the entire content of a database out to a file. This file can later be read back into ctdb using the restoredb command.
|
||
This is mainly useful for backing up persistent databases such as secrets.tdb and similar.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529490"></a><h3>restoredb <file></h3><p>
|
||
This command restores a persistent database that was previously backed up using backupdb.
|
||
</p></div></div><div class="refsect1" lang="en"><a name="id2529502"></a><h2>Debugging Commands</h2><p>
|
||
These commands are primarily used for CTDB development and testing and
|
||
should not be used for normal administration.
|
||
</p><div class="refsect2" lang="en"><a name="id2529512"></a><h3>process-exists <pid></h3><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2529524"></a><h3>getdbmap</h3><p>
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
Example: ctdb getdbmap
|
||
</p><p>
|
||
Example output:
|
||
</p><pre class="screen">
|
||
Number of databases:10
|
||
dbid:0x435d3410 name:notify.tdb path:/var/ctdb/notify.tdb.0
|
||
dbid:0x42fe72c5 name:locking.tdb path:/var/ctdb/locking.tdb.0 dbid:0x1421fb78 name:brlock.tdb path:/var/ctdb/brlock.tdb.0
|
||
dbid:0x17055d90 name:connections.tdb path:/var/ctdb/connections.tdb.0
|
||
dbid:0xc0bdde6a name:sessionid.tdb path:/var/ctdb/sessionid.tdb.0
|
||
dbid:0x122224da name:test.tdb path:/var/ctdb/test.tdb.0
|
||
dbid:0x2672a57f name:idmap2.tdb path:/var/ctdb/persistent/idmap2.tdb.0 PERSISTENT
|
||
dbid:0xb775fff6 name:secrets.tdb path:/var/ctdb/persistent/secrets.tdb.0 PERSISTENT
|
||
dbid:0xe98e08b6 name:group_mapping.tdb path:/var/ctdb/persistent/group_mapping.tdb.0 PERSISTENT
|
||
dbid:0x7bbbd26c name:passdb.tdb path:/var/ctdb/persistent/passdb.tdb.0 PERSISTENT
|
||
</pre></div><div class="refsect2" lang="en"><a name="id2529558"></a><h3>catdb <dbname></h3><p>
|
||
This command will dump a clustered TDB database to the screen. This is a debugging command.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476137"></a><h3>getmonmode</h3><p>
|
||
This command returns the monutoring mode of a node. The monitoring mode is either ACTIVE or DISABLED. Normally a node will continously monitor that all other nodes that are expected are in fact connected and that they respond to commands.
|
||
</p><p>
|
||
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.
|
||
</p><p>
|
||
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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476168"></a><h3>setmonmode <0|1></h3><p>
|
||
This command can be used to explicitely 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.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476183"></a><h3>attach <dbname></h3><p>
|
||
This is a debugging command. This command will make the CTDB daemon create a new CTDB database and attach to it.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476195"></a><h3>dumpmemory</h3><p>
|
||
This is a debugging command. This command will make the ctdb
|
||
daemon to write a fill memory allocation map to standard output.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476206"></a><h3>rddumpmemory</h3><p>
|
||
This is a debugging command. This command will dump the talloc memory
|
||
allocation tree for the recovery daemon to standard output.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476218"></a><h3>freeze</h3><p>
|
||
This command will lock all the local TDB databases causing clients
|
||
that are accessing these TDBs such as samba3 to block until the
|
||
databases are thawed.
|
||
</p><p>
|
||
This is primarily used by the recovery daemon to stop all samba
|
||
daemons from accessing any databases while the database is recovered
|
||
and rebuilt.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476236"></a><h3>thaw</h3><p>
|
||
Thaw a previously frozen node.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476246"></a><h3>eventscript <arguments></h3><p>
|
||
This is a debugging command. This command can be used to manually
|
||
invoke and run the eventscritps with arbitrary arguments.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476257"></a><h3>ban <bantime|0></h3><p>
|
||
Administratively ban a node for bantime seconds. A bantime of 0 means that the node should be permanently banned.
|
||
</p><p>
|
||
A banned node does not participate in the cluster and does not host any records for the clustered TDB. Its ip address has been taken over by an other node and no services are hosted.
|
||
</p><p>
|
||
Nodes are automatically banned if they are the cause of too many
|
||
cluster recoveries.
|
||
</p></div><div class="refsect2" lang="en"><a name="id2476281"></a><h3>unban</h3><p>
|
||
This command is used to unban a node that has either been
|
||
administratively banned using the ban command or has been automatically
|
||
banned by the recovery daemon.
|
||
</p></div></div><div class="refsect1" lang="en"><a name="id2476294"></a><h2>SEE ALSO</h2><p>
|
||
ctdbd(1), onnode(1)
|
||
<a class="ulink" href="http://ctdb.samba.org/" target="_top">http://ctdb.samba.org/</a>
|
||
</p></div><div class="refsect1" lang="en"><a name="id2476307"></a><h2>COPYRIGHT/LICENSE</h2><div class="literallayout"><p><br>
|
||
Copyright<EFBFBD>(C)<29>Andrew<65>Tridgell<6C>2007<br>
|
||
Copyright<EFBFBD>(C)<29>Ronnie<69>sahlberg<72>2007<br>
|
||
<br>
|
||
This<EFBFBD>program<EFBFBD>is<EFBFBD>free<EFBFBD>software;<3B>you<6F>can<61>redistribute<74>it<69>and/or<6F>modify<br>
|
||
it<EFBFBD>under<EFBFBD>the<EFBFBD>terms<EFBFBD>of<EFBFBD>the<EFBFBD>GNU<EFBFBD>General<EFBFBD>Public<EFBFBD>License<EFBFBD>as<EFBFBD>published<EFBFBD>by<br>
|
||
the<EFBFBD>Free<EFBFBD>Software<EFBFBD>Foundation;<3B>either<65>version<6F>3<EFBFBD>of<6F>the<68>License,<2C>or<6F>(at<br>
|
||
your<EFBFBD>option)<29>any<6E>later<65>version.<br>
|
||
<br>
|
||
This<EFBFBD>program<EFBFBD>is<EFBFBD>distributed<EFBFBD>in<EFBFBD>the<EFBFBD>hope<EFBFBD>that<EFBFBD>it<EFBFBD>will<EFBFBD>be<EFBFBD>useful,<2C>but<br>
|
||
WITHOUT<EFBFBD>ANY<EFBFBD>WARRANTY;<3B>without<75>even<65>the<68>implied<65>warranty<74>of<br>
|
||
MERCHANTABILITY<EFBFBD>or<EFBFBD>FITNESS<EFBFBD>FOR<EFBFBD>A<EFBFBD>PARTICULAR<EFBFBD>PURPOSE.<2E><>See<65>the<68>GNU<br>
|
||
General<EFBFBD>Public<EFBFBD>License<EFBFBD>for<EFBFBD>more<EFBFBD>details.<br>
|
||
<br>
|
||
You<EFBFBD>should<EFBFBD>have<EFBFBD>received<EFBFBD>a<EFBFBD>copy<EFBFBD>of<EFBFBD>the<EFBFBD>GNU<EFBFBD>General<EFBFBD>Public<EFBFBD>License<br>
|
||
along<EFBFBD>with<EFBFBD>this<EFBFBD>program;<3B>if<69>not,<2C>see<65>http://www.gnu.org/licenses/.<br>
|
||
</p></div></div></div></body></html>
|