2007-10-07 17:16:16 +05:30
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
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<refentry id='limits5'>
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2007-10-07 17:16:25 +05:30
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<!-- $Id: limits.5.xml,v 1.6 2005/06/14 20:18:17 kloczek Exp $ -->
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2007-10-07 17:16:16 +05:30
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<refmeta>
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<refentrytitle>LIMITS</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv id='name'>
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<refname>limits</refname>
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<refpurpose>Resource limits definition</refpurpose>
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</refnamediv>
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<!-- body begins here -->
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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The <emphasis remap='I'>limits</emphasis> file (/etc/limits by
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default or LIMITS_FILE defined
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config.h) describes the resource limits you wish to impose. It
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should be
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owned by root and readable by root account only.
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</para>
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<para>By default no quotas are imposed on 'root'. In fact, there is no
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way to impose
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limits via this procedure to root-equiv accounts (accounts with UID
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0).
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</para>
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<para>Each line describes a limit for a user in the form:</para>
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<para>
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<emphasis remap='I'>user LIMITS_STRING</emphasis>
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</para>
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<para>
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The <emphasis remap='B'>LIMITS_STRING</emphasis> is a string of a
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concatenated list of resource limits.
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Each limit consists of a letter identifier followed by a numerical
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limit.
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</para>
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<para>The valid identifiers are:</para>
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<para>A: max address space (KB)
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<!-- .br -->
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C: max core file size (KB)
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<!-- .br -->
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D: max data size (KB)
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<!-- .br -->
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F: maximum filesize (KB)
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<!-- .br -->
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M: max locked-in-memory address space (KB)
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<!-- .br -->
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N: max number of open files
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<!-- .br -->
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R: max resident set size (KB)
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<!-- .br -->
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S: max stack size (KB)
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<!-- .br -->
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T: max CPU time (MIN)
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<!-- .br -->
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U: max number of processes
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<!-- .br -->
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K: file creation mask, set by
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<citerefentry>
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<refentrytitle>umask</refentrytitle><manvolnum>2</manvolnum>
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</citerefentry>
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.
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<!-- .br -->
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L: max number of logins for this user
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<!-- .br -->
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P: process priority, set by
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<citerefentry>
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<refentrytitle>setpriority</refentrytitle><manvolnum>2</manvolnum>
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</citerefentry>
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.
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</para>
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<para> For example, <emphasis remap='I'>L2D2048N5</emphasis> is a valid
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<emphasis remap='B'>LIMITS_STRING </emphasis>. For reading
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convenience, the following entries are equivalent:
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</para>
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<para>username L2D2048N5
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<!-- .br -->
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username L2 D2048 N5
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</para>
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<para> Be aware that after <emphasis remap='I'>username</emphasis> the
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rest of the line is considered a limit string, thus comments are not
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allowed. A invalid limits string will be rejected (not considered) by
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the login program.
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</para>
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<para> The default entry is denoted by username "<emphasis
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remap='B'>*</emphasis>". If you have multiple <emphasis
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remap='I'>default</emphasis> entries in your <emphasis
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remap='B'>LIMITS_FILE</emphasis>, then the last one will be used as
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the default entry.
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</para>
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<para>To completely disable limits for a user, a single dash "<emphasis
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remap='B'>-</emphasis> "will do.
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</para>
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<para>Also, please note that all limit settings are set PER LOGIN. They
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are not global, nor are they permanent. Perhaps global limits will
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come, but for now this will have to do ;)
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</para>
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</refsect1>
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<refsect1 id='files'>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/limits</filename></term>
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<listitem></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='see_also'>
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<title>SEE ALSO</title>
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2007-10-07 17:16:25 +05:30
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<para><citerefentry>
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2007-10-07 17:16:16 +05:30
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<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>setpriority</refentrytitle><manvolnum>2</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum>
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</citerefentry>
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</para>
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</refsect1>
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<refsect1 id='author'>
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<title>AUTHOR</title>
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<para>Cristian Gafton (gafton@sorosis.ro)</para>
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</refsect1>
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</refentry>
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