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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>krb5kdc — MIT Kerberos Documentation</title> <link rel="stylesheet" href="../../_static/agogo.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../../_static/kerb.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../', VERSION: '1.15.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <link rel="author" title="About these documents" href="../../about.html" /> <link rel="copyright" title="Copyright" href="../../copyright.html" /> <link rel="top" title="MIT Kerberos Documentation" href="../../index.html" /> <link rel="up" title="Administration programs" href="index.html" /> <link rel="next" title="kprop" href="kprop.html" /> <link rel="prev" title="kdb5_ldap_util" href="kdb5_ldap_util.html" /> </head> <body> <div class="header-wrapper"> <div class="header"> <h1><a href="../../index.html">MIT Kerberos Documentation</a></h1> <div class="rel"> <a href="../../index.html" title="Full Table of Contents" accesskey="C">Contents</a> | <a href="kdb5_ldap_util.html" title="kdb5_ldap_util" accesskey="P">previous</a> | <a href="kprop.html" title="kprop" accesskey="N">next</a> | <a href="../../genindex.html" title="General Index" accesskey="I">index</a> | <a href="../../search.html" title="Enter search criteria" accesskey="S">Search</a> | <a href="mailto:krb5-bugs@mit.edu?subject=Documentation__krb5kdc">feedback</a> </div> </div> </div> <div class="content-wrapper"> <div class="content"> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="krb5kdc"> <span id="krb5kdc-8"></span><h1>krb5kdc<a class="headerlink" href="#krb5kdc" title="Permalink to this headline">¶</a></h1> <div class="section" id="synopsis"> <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2> <p><strong>krb5kdc</strong> [<strong>-x</strong> <em>db_args</em>] [<strong>-d</strong> <em>dbname</em>] [<strong>-k</strong> <em>keytype</em>] [<strong>-M</strong> <em>mkeyname</em>] [<strong>-p</strong> <em>portnum</em>] [<strong>-m</strong>] [<strong>-r</strong> <em>realm</em>] [<strong>-n</strong>] [<strong>-w</strong> <em>numworkers</em>] [<strong>-P</strong> <em>pid_file</em>] [<strong>-T</strong> <em>time_offset</em>]</p> </div> <div class="section" id="description"> <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> <p>krb5kdc is the Kerberos version 5 Authentication Service and Key Distribution Center (AS/KDC).</p> </div> <div class="section" id="options"> <h2>OPTIONS<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2> <p>The <strong>-r</strong> <em>realm</em> option specifies the realm for which the server should provide service.</p> <p>The <strong>-d</strong> <em>dbname</em> option specifies the name under which the principal database can be found. This option does not apply to the LDAP database.</p> <p>The <strong>-k</strong> <em>keytype</em> option specifies the key type of the master key to be entered manually as a password when <strong>-m</strong> is given; the default is <tt class="docutils literal"><span class="pre">des-cbc-crc</span></tt>.</p> <p>The <strong>-M</strong> <em>mkeyname</em> option specifies the principal name for the master key in the database (usually <tt class="docutils literal"><span class="pre">K/M</span></tt> in the KDC’s realm).</p> <p>The <strong>-m</strong> option specifies that the master database password should be fetched from the keyboard rather than from a stash file.</p> <p>The <strong>-n</strong> option specifies that the KDC does not put itself in the background and does not disassociate itself from the terminal. In normal operation, you should always allow the KDC to place itself in the background.</p> <p>The <strong>-P</strong> <em>pid_file</em> option tells the KDC to write its PID into <em>pid_file</em> after it starts up. This can be used to identify whether the KDC is still running and to allow init scripts to stop the correct process.</p> <p>The <strong>-p</strong> <em>portnum</em> option specifies the default UDP port numbers which the KDC should listen on for Kerberos version 5 requests, as a comma-separated list. This value overrides the UDP port numbers specified in the <a class="reference internal" href="../conf_files/kdc_conf.html#kdcdefaults"><em>[kdcdefaults]</em></a> section of <a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>, but may be overridden by realm-specific values. If no value is given from any source, the default port is 88.</p> <p>The <strong>-w</strong> <em>numworkers</em> option tells the KDC to fork <em>numworkers</em> processes to listen to the KDC ports and process requests in parallel. The top level KDC process (whose pid is recorded in the pid file if the <strong>-P</strong> option is also given) acts as a supervisor. The supervisor will relay SIGHUP signals to the worker subprocesses, and will terminate the worker subprocess if the it is itself terminated or if any other worker process exits.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">On operating systems which do not have <em>pktinfo</em> support, using worker processes will prevent the KDC from listening for UDP packets on network interfaces created after the KDC starts.</p> </div> <p>The <strong>-x</strong> <em>db_args</em> option specifies database-specific arguments. See <a class="reference internal" href="kadmin_local.html#dboptions"><em>Database Options</em></a> in <a class="reference internal" href="kadmin_local.html#kadmin-1"><em>kadmin</em></a> for supported arguments.</p> <p>The <strong>-T</strong> <em>offset</em> option specifies a time offset, in seconds, which the KDC will operate under. It is intended only for testing purposes.</p> </div> <div class="section" id="example"> <h2>EXAMPLE<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> <p>The KDC may service requests for multiple realms (maximum 32 realms). The realms are listed on the command line. Per-realm options that can be specified on the command line pertain for each realm that follows it and are superseded by subsequent definitions of the same option.</p> <p>For example:</p> <div class="highlight-python"><pre>krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3</pre> </div> <p>specifies that the KDC listen on port 2001 for REALM1 and on port 2002 for REALM2 and REALM3. Additionally, per-realm parameters may be specified in the <a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a> file. The location of this file may be specified by the <strong>KRB5_KDC_PROFILE</strong> environment variable. Per-realm parameters specified in this file take precedence over options specified on the command line. See the <a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a> description for further details.</p> </div> <div class="section" id="environment"> <h2>ENVIRONMENT<a class="headerlink" href="#environment" title="Permalink to this headline">¶</a></h2> <p>See <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><em>kerberos</em></a> for a description of Kerberos environment variables.</p> </div> <div class="section" id="see-also"> <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2> <p><a class="reference internal" href="kdb5_util.html#kdb5-util-8"><em>kdb5_util</em></a>, <a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>, <a class="reference internal" href="../conf_files/krb5_conf.html#krb5-conf-5"><em>krb5.conf</em></a>, <a class="reference internal" href="kdb5_ldap_util.html#kdb5-ldap-util-8"><em>kdb5_ldap_util</em></a>, <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><em>kerberos</em></a></p> </div> </div> </div> </div> </div> </div> <div class="sidebar"> <h2>On this page</h2> <ul> <li><a class="reference internal" href="#">krb5kdc</a><ul> <li><a class="reference internal" href="#synopsis">SYNOPSIS</a></li> <li><a class="reference internal" href="#description">DESCRIPTION</a></li> <li><a class="reference internal" href="#options">OPTIONS</a></li> <li><a class="reference internal" href="#example">EXAMPLE</a></li> <li><a class="reference internal" href="#environment">ENVIRONMENT</a></li> <li><a class="reference internal" href="#see-also">SEE ALSO</a></li> </ul> </li> </ul> <br/> <h2>Table of contents</h2> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="../../user/index.html">For users</a></li> <li class="toctree-l1 current"><a class="reference internal" href="../index.html">For administrators</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="../install.html">Installation guide</a></li> <li class="toctree-l2"><a class="reference internal" href="../conf_files/index.html">Configuration Files</a></li> <li class="toctree-l2"><a class="reference internal" href="../realm_config.html">Realm configuration decisions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database.html">Database administration</a></li> <li class="toctree-l2"><a class="reference internal" href="../lockout.html">Account lockout</a></li> <li class="toctree-l2"><a class="reference internal" href="../conf_ldap.html">Configuring Kerberos with OpenLDAP back-end</a></li> <li class="toctree-l2"><a class="reference internal" href="../appl_servers.html">Application servers</a></li> <li class="toctree-l2"><a class="reference internal" href="../host_config.html">Host configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../backup_host.html">Backups of secure hosts</a></li> <li class="toctree-l2"><a class="reference internal" href="../pkinit.html">PKINIT configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../otp.html">OTP Preauthentication</a></li> <li class="toctree-l2"><a class="reference internal" href="../princ_dns.html">Principal names and DNS</a></li> <li class="toctree-l2"><a class="reference internal" href="../enctypes.html">Encryption types</a></li> <li class="toctree-l2"><a class="reference internal" href="../https.html">HTTPS proxy configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../auth_indicator.html">Authentication indicators</a></li> <li class="toctree-l2 current"><a class="reference internal" href="index.html">Administration programs</a><ul class="current"> <li class="toctree-l3"><a class="reference internal" href="kadmin_local.html">kadmin</a></li> <li class="toctree-l3"><a class="reference internal" href="kadmind.html">kadmind</a></li> <li class="toctree-l3"><a class="reference internal" href="kdb5_util.html">kdb5_util</a></li> <li class="toctree-l3"><a class="reference internal" href="kdb5_ldap_util.html">kdb5_ldap_util</a></li> <li class="toctree-l3 current"><a class="current reference internal" href="">krb5kdc</a></li> <li class="toctree-l3"><a class="reference internal" href="kprop.html">kprop</a></li> <li class="toctree-l3"><a class="reference internal" href="kpropd.html">kpropd</a></li> <li class="toctree-l3"><a class="reference internal" href="kproplog.html">kproplog</a></li> <li class="toctree-l3"><a class="reference internal" href="ktutil.html">ktutil</a></li> <li class="toctree-l3"><a class="reference internal" href="k5srvutil.html">k5srvutil</a></li> <li class="toctree-l3"><a class="reference internal" href="sserver.html">sserver</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="../../mitK5defaults.html">MIT Kerberos defaults</a></li> <li class="toctree-l2"><a class="reference internal" 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class="toctree-l1"><a class="reference internal" href="../../mitK5features.html">MIT Kerberos features</a></li> <li class="toctree-l1"><a class="reference internal" href="../../build_this.html">How to build this documentation from the source</a></li> <li class="toctree-l1"><a class="reference internal" href="../../about.html">Contributing to the MIT Kerberos Documentation</a></li> <li class="toctree-l1"><a class="reference internal" href="../../resources.html">Resources</a></li> </ul> <br/> <h4><a href="../../index.html">Full Table of Contents</a></h4> <h4>Search</h4> <form class="search" action="../../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <div class="clearer"></div> </div> </div> <div class="footer-wrapper"> <div class="footer" > <div class="right" ><i>Release: 1.15.1</i><br /> © <a 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