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82 lines
2.7 KiB
HTML
82 lines
2.7 KiB
HTML
<!--#set var="TITLE" value="CTDB and Samba" -->
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<h1>Setting up clustered samba</h1>
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It is assumed tou have already installed the ctdb version of samba and also installed, configured and tested CTDB.
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<h2>Create a user account</h2>
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First you need to initialise the Samba password database so that you have some user that can authenticate to the samba service.<br>
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Do this by running:
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<pre>
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smbpasswd -a root
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</pre>
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Samba with clustering must use the tdbsam or ldap SAM passdb backends (it must not use the default smbpasswd backend), or must be configured to be a member of a domain.<br>
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The rest of the configuration of Samba is exactly as it is done on a normal system.<br><br>
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See the docs on http://samba.org/ for details.
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<h2>Critical smb.conf parameters</h2>
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A clustered Samba install must set some specific configuration parameters
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<pre>
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clustering = yes
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idmap backend = tdb2
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private dir = /a/directory/on/your/cluster/filesystem
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</pre>
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It is vital that the private directory is on shared storage.
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<h2>Using smbcontrol</h2>
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You can check for connectivity to the smbd daemons on each node using smbcontrol
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<pre>
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smbcontrol smbd ping
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</pre>
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<h2>Using Samba4 smbtorture</h2>
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The Samba4 version of smbtorture has several tests that can be used to benchmark a CIFS cluster.<br>
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You can download Samba4 like this:
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<pre>
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svn co svn://svnanon.samba.org/samba/branches/SAMBA_4_0
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</pre>
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Then configure and compile it as usual.<br>
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The particular tests that are helpful for cluster benchmarking are the RAW-BENCH-OPEN, RAW-BENCH-LOCK and BENCH-NBENCH tests.<br>
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These tests take a unclist that allows you to spread the workload out over more than one node. For example:
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<pre>
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smbtorture //localhost/data -Uuser%password RAW-BENCH-LOCK --unclist=unclist.txt --num-progs=32 -t60
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</pre>
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The file unclist.txt should contain a list of server names in your cluster prefixed by //. For example
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<pre>
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//192.168.1.1
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//192.168.1.2
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//192.168.2.1
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//192.168.2.2
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</pre>
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For NBENCH testing you need a client.txt file.<br>
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A suitable file can be found in the dbench distribution at http://samba.org/ftp/tridge/dbench/
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<h3>CTDB_MANAGES_SAMBA</h3>
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This is a parameter in /etc/sysconfig/ctdb<br><br>
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When this parameter is set to "yes" CTDB will start/stop/restart the localo samba daemon as the cluster configuration changes.<br><br>
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When this parameter is set you should also make sure that samba is NOT started by default by the linux system when it boots:
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<pre>
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chkconfig samba off
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</pre>
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Example:
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<pre>
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CTDB_MANAGES_SAMBA="yes"
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</pre>
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It is strongly recommended that you set this parameter to "yes" if you intend to use clustered samba.
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