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113 lines
3.1 KiB
HTML
113 lines
3.1 KiB
HTML
<!--#set var="TITLE" value="CTDB Testing" -->
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<!--#include virtual="header.html" -->
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<H2 align="center">Starting and testing CTDB</h2>
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The CTDB log is in /var/log/log.ctdb so look in this file if something
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did not start correctly.<p>
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You can ensure that ctdb is running on all nodes using
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<pre>
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onnode all service ctdb start
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</pre>
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Verify that the CTDB daemon started properly. There should normally be at least 2 processes started for CTDB, one for the main daemon and one for the recovery daemon.
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<pre>
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onnode all pidof ctdbd
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</pre>
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Once all CTDB nodes have started, verify that they are correctly
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talking to each other.<p>
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There should be one TCP connection from the private ip address on each
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node to TCP port 4379 on each of the other nodes in the cluster.
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<pre>
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onnode all netstat -tn | grep 4379
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</pre>
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<h2>Automatically restarting CTDB</h2>
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If you wish to cope with software faults in ctdb, or want ctdb to
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automatically restart when an administration kills it, then you may
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wish to add a cron entry for root like this:
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<pre>
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* * * * * /etc/init.d/ctdb cron > /dev/null 2>&1
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</pre>
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<h2>Testing CTDB</h2>
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Once your cluster is up and running, you may wish to know how to test that it is functioning correctly. The following tests may help with that
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<h3>The ctdb tool</h3>
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The ctdb package comes with a utility called ctdb that can be used to
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view the behaviour of the ctdb cluster.<p>
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If you run it with no options it will provide some terse usage information. The most commonly used commands are:
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<pre>
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ctdb status
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ctdb ip
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ctdb ping
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</pre>
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<h3>ctdb status</h3>
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The status command provides basic information about the cluster and the status of the nodes. when you run it you will get some output like:
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<pre>
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<strong>Number of nodes:4
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vnn:0 10.1.1.1 OK (THIS NODE)
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vnn:1 10.1.1.2 OK
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vnn:2 10.1.1.3 OK
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vnn:3 10.1.1.4 OK</strong>
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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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<strong>Recovery mode:NORMAL (0)</strong>
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Recovery master:0
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</pre>
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The important parts are in bold. This tells us that all 4 nodes are in
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a healthy state.<p>
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It also tells us that recovery mode is normal, which means that the
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cluster has finished a recovery and is running in a normal fully
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operational state.<p>
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Recovery state will briefly change to "RECOVERY" when there ahs been a
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node failure or something is wrong with the cluster.<p>
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If the cluster remains in RECOVERY state for very long (many seconds)
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there might be something wrong with the configuration. See
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/var/log/log.ctdb.
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<h3>ctdb ip</h3>
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This command prints the current status of the public ip addresses and which physical node is currently serving that ip.
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<pre>
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Number of nodes:4
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192.168.1.1 0
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192.168.1.2 1
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192.168.2.1 2
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192.168.2.1 3
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</pre>
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<h3>ctdb ping</h3>
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this command tries to "ping" each of the CTDB daemons in the cluster.
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<pre>
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ctdb ping -n all
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response from 0 time=0.000050 sec (13 clients)
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response from 1 time=0.000154 sec (27 clients)
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response from 2 time=0.000114 sec (17 clients)
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response from 3 time=0.000115 sec (59 clients)
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</pre>
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<!--#include virtual="footer.html" -->
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