<?xml version="1.0" encoding="UTF-8"?>
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<section xml:id="prerequisites-file-descriptors"
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xsi:schemaLocation='http://docbook.org/ns/docbook
<title>Maximum Open Files</title>
<indexterm>
<primary>File descriptors</primary>
<secondary>Requirements</secondary>
</indexterm>
<para>
OpenDJ needs to be able to open many file descriptors,
especially when handling thousands of client connections.
Linux systems in particular often set a limit of 1024 per user,
which is too low to handle many client connections to OpenDJ.
</para>
<para>
When setting up OpenDJ for production use,
make sure OpenDJ can use at least 64K (65536) file descriptors.
For example when running OpenDJ as user <literal>opendj</literal>
on a Linux system that uses
you can set soft and hard limits by adding these lines to the file:
</para>
<programlisting language="none">opendj soft nofile 65536
opendj hard nofile 131072</programlisting>
<para>
The example above assumes the system has
enough file descriptors available overall.
You can check the Linux system overall maximum as follows.
</para>
204252</screen>
</section>