added performance chapter
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Roland Gruber
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@ -1201,7 +1201,7 @@ Have fun!
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</listitem>
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</itemizedlist>
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<section>
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<section id="general_settings">
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<title>General settings</title>
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<para>Here you can specify the LDAP server and some security
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@ -8368,7 +8368,7 @@ objectclass: top
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<literallayout>
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</literallayout>
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<para><emphasis role="bold">Indices:</emphasis></para>
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<para id="indices"><emphasis role="bold">Indices:</emphasis></para>
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<para>Indices will improve the performance when searching for entries in
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the LDAP directory. The following indices are recommended:</para>
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@ -8647,7 +8647,7 @@ objectclass: top
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service customisations.</para>
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</appendix>
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<appendix>
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<appendix id="clustering">
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<title>Clustering LAM</title>
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<para>LAM is a web application based on PHP. Therefore, clustering is not
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@ -8722,11 +8722,15 @@ objectclass: top
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<appendix>
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<title>Troubleshooting</title>
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<section>
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<title>Functional issues</title>
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<para><emphasis role="bold">Size limit</emphasis></para>
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<para>You will get a message like "LDAP sizelimit exceeded, not all
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entries are shown." when you hit the LDAP search limit. See the <link
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linkend="size_limit_exceeded">OpenLDAP settings</link> to fix this.</para>
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linkend="size_limit_exceeded">OpenLDAP settings</link> to fix
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this.</para>
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<literallayout>
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</literallayout>
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@ -8745,10 +8749,10 @@ objectclass: top
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<para>This can be done by running "Tools" -> "Tests" -> "Schema
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test" inside LAM.</para>
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<para>If there are any object classes or attributes missing you will get a
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notice. See <link linkend="a_schema">LDAP schema files</link> for a list
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of used schemas. You may also want to deactive unused modules in your LAM
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server profile (tab "Modules").</para>
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<para>If there are any object classes or attributes missing you will get
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a notice. See <link linkend="a_schema">LDAP schema files</link> for a
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list of used schemas. You may also want to deactive unused modules in
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your LAM server profile (tab "Modules").</para>
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<screenshot>
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<mediaobject>
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@ -8782,7 +8786,95 @@ objectclass: top
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</listitem>
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</itemizedlist>
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<para>After changing the configuration please restart OpenLDAP. It usually
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uses /var/log/syslog for log output.</para>
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<para>After changing the configuration please restart OpenLDAP. It
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usually uses /var/log/syslog for log output.</para>
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</section>
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<section>
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<title>Performance issues</title>
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<para>LAM is tested to work with 10000 users with acceptable
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performance. If you have a larger directory or slow hardware then here
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are some points to increase performance.</para>
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<literallayout>
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</literallayout>
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<para>The first step is to check if performance problems are caused by
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the LAM web server or the LDAP server. Please check which machine
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suffers from high system load (CPU/memory consumption).</para>
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<para>High network latency may also be a problem. For large
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installations please make sure that LAM web server and LDAP server are
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located in the same building/server room.</para>
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<para>If you run LAM on multiple nodes (DNS load balancing/hardware load
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balancer) then also check the <link linkend="clustering">clustering
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section</link>.</para>
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<section>
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<title>LDAP server</title>
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<para><emphasis role="bold">Use indices</emphasis></para>
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<para>Depending on the queries it may help to add some more indices on
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the LDAP server. Depending on your LDAP software it may already
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suggest indices in its log files. See <link
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linkend="indices">here</link> for typical OpenLDAP indices.</para>
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<literallayout>
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</literallayout>
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<para><emphasis role="bold">Reduce query results by splitting LDAP
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management into multiple server profiles</emphasis></para>
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<para>If you manage a very large directory then it might already be
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separated into multiple subtrees (e.g. by country, subsidiary, ...).
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Do not use a single LAM server profile to manage your whole directory.
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Use different server profiles for each separated LDAP subtree where
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possible (e.g. one for German users and one for French ones).</para>
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<literallayout>
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</literallayout>
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<para><emphasis role="bold">Limit query results</emphasis></para>
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<para>LAM allows to set an <ulink url="general_settings">LDAP search
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limit</ulink> for each server profile. This will limit the number of
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entries returned by your LDAP server. Use with caution because it can
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cause problems (e.g. with automatic UID generation) when LAM is not
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able to read all entries.</para>
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</section>
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<section>
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<title>LAM web server</title>
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<para><emphasis role="bold">Install a PHP
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accelerator</emphasis></para>
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<para>There are tools like <ulink
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url="http://www.php.net/manual/en/book.apc.php">APC</ulink> (free) or
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<ulink url="http://www.zend.com/en/products/server/">Zend
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Server</ulink> (commercial) that provide caching of PHP pages to
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improve performance. They will reduce the time for parsing the PHP
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pages and IO load.</para>
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<para>This is a simply way to enhance performance since APC is part of
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most Linux distributions.</para>
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<para>If you use APC then make sure that it uses enough memory (e.g.
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"apc.shm_size=128M"). You can check the memory usage with the file
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apc.php that is shipped with APC.</para>
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<literallayout>
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</literallayout>
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<para><emphasis role="bold">Disable session
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encryption</emphasis></para>
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<para>LAM encrypts sensitive data in your session files. You can
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prevent this by disabling the PHP MCrypt module (if installed).</para>
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</section>
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</section>
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</appendix>
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</book>
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