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<h1><a href="../../index.html">MIT Kerberos Documentation</a></h1>
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<section id="krb5kdc">
<span id="krb5kdc-8"></span><h1>krb5kdc<a class="headerlink" href="#krb5kdc" title="Link to this heading">¶</a></h1>
<section id="synopsis">
<h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Link to this heading">¶</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>
</section>
<section id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Link to this heading">¶</a></h2>
<p>krb5kdc is the Kerberos version 5 Authentication Service and Key
Distribution Center (AS/KDC).</p>
</section>
<section id="options">
<h2>OPTIONS<a class="headerlink" href="#options" title="Link to this heading">¶</a></h2>
<p>The <strong>-r</strong> <em>realm</em> option specifies the realm for which the server
should provide service. This option may be specified multiple times
to serve multiple realms. If no <strong>-r</strong> option is given, the default
realm (as specified in <a class="reference internal" href="../conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>) will be served.</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 <code class="docutils literal notranslate"><span class="pre">aes256-cts-hmac-sha1-96</span></code>.</p>
<p>The <strong>-M</strong> <em>mkeyname</em> option specifies the principal name for the
master key in the database (usually <code class="docutils literal notranslate"><span class="pre">K/M</span></code> 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.</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 and TCP port
numbers which the KDC should listen on for Kerberos version 5
requests, as a comma-separated list. This value overrides the port
numbers specified in the <a class="reference internal" href="../conf_files/kdc_conf.html#kdcdefaults"><span class="std std-ref">[kdcdefaults]</span></a> section of
<a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><span class="std std-ref">kdc.conf</span></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>
<p>The <strong>-x</strong> <em>db_args</em> option specifies database-specific arguments.
See <a class="reference internal" href="kadmin_local.html#dboptions"><span class="std std-ref">Database Options</span></a> in <a class="reference internal" href="kadmin_local.html#kadmin-1"><span class="std std-ref">kadmin</span></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>
</section>
<section id="example">
<h2>EXAMPLE<a class="headerlink" href="#example" title="Link to this heading">¶</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-default notranslate"><div class="highlight"><pre><span></span><span class="n">krb5kdc</span> <span class="o">-</span><span class="n">p</span> <span class="mi">2001</span> <span class="o">-</span><span class="n">r</span> <span class="n">REALM1</span> <span class="o">-</span><span class="n">p</span> <span class="mi">2002</span> <span class="o">-</span><span class="n">r</span> <span class="n">REALM2</span> <span class="o">-</span><span class="n">r</span> <span class="n">REALM3</span>
</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"><span class="std std-ref">kdc.conf</span></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"><span class="std std-ref">kdc.conf</span></a>
description for further details.</p>
</section>
<section id="environment">
<h2>ENVIRONMENT<a class="headerlink" href="#environment" title="Link to this heading">¶</a></h2>
<p>See <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><span class="std std-ref">kerberos</span></a> for a description of Kerberos environment
variables.</p>
<p>As of release 1.22, krb5kdc supports systemd socket activation via the
LISTEN_PID and LISTEN_FDS environment variables. Sockets provided by
the caller must correspond to configured listener addresses (via the
<strong>kdc_listen</strong> variable or equivalent) or they will be ignored. Any
configured listener addresses that do not correspond to
caller-provided sockets will be ignored if socket activation is used.</p>
</section>
<section id="see-also">
<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Link to this heading">¶</a></h2>
<p><a class="reference internal" href="kdb5_util.html#kdb5-util-8"><span class="std std-ref">kdb5_util</span></a>, <a class="reference internal" href="../conf_files/kdc_conf.html#kdc-conf-5"><span class="std std-ref">kdc.conf</span></a>, <a class="reference internal" href="../conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a>,
<a class="reference internal" href="kdb5_ldap_util.html#kdb5-ldap-util-8"><span class="std std-ref">kdb5_ldap_util</span></a>, <a class="reference internal" href="../../user/user_config/kerberos.html#kerberos-7"><span class="std std-ref">kerberos</span></a></p>
</section>
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<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>
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<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="../dbtypes.html">Database types</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="../spake.html">SPAKE Preauthentication</a></li>
<li class="toctree-l2"><a class="reference internal" href="../dictionary.html">Addressing dictionary attack risks</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>
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<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>
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<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="../../formats/index.html">Protocols and file formats</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>
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