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<h1><a href="../../index.html">MIT Kerberos Documentation</a></h1>
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<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 ports are 88 and 750.</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"><div class="highlight"><pre>krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3
</pre></div>
</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>krb5kdc uses the following environment variables:</p>
<ul class="simple">
<li><strong>KRB5_CONFIG</strong></li>
<li><strong>KRB5_KDC_PROFILE</strong></li>
</ul>
</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></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 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" href="../env_variables.html">Environment variables</a></li>
<li class="toctree-l2"><a class="reference internal" href="../troubleshoot.html">Troubleshooting</a></li>
<li class="toctree-l2"><a class="reference internal" href="../advanced/index.html">Advanced topics</a></li>
<li class="toctree-l2"><a class="reference internal" href="../various_envs.html">Various links</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../appdev/index.html">For application developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../plugindev/index.html">For plugin module developers</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../build/index.html">Building Kerberos V5</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../basic/index.html">Kerberos V5 concepts</a></li>
<li 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>
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