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<div class="section" id="backups-of-secure-hosts">
<h1>Backups of secure hosts<a class="headerlink" href="#backups-of-secure-hosts" title="Permalink to this headline">¶</a></h1>
<p>When you back up a secure host, you should exclude the host’s keytab
file from the backup. If someone obtained a copy of the keytab from a
backup, that person could make any host masquerade as the host whose
keytab was compromised. In many configurations, knowledge of the
host’s keytab also allows root access to the host. This could be
particularly dangerous if the compromised keytab was from one of your
KDCs. If the machine has a disk crash and the keytab file is lost, it
is easy to generate another keytab file. (See <a class="reference internal" href="appl_servers.html#add-princ-kt"><em>Adding principals to keytabs</em></a>.)
If you are unable to exclude particular files from backups, you should
ensure that the backups are kept as secure as the host’s root
password.</p>
<div class="section" id="backing-up-the-kerberos-database">
<h2>Backing up the Kerberos database<a class="headerlink" href="#backing-up-the-kerberos-database" title="Permalink to this headline">¶</a></h2>
<p>As with any file, it is possible that your Kerberos database could
become corrupted. If this happens on one of the slave KDCs, you might
never notice, since the next automatic propagation of the database
would install a fresh copy. However, if it happens to the master KDC,
the corrupted database would be propagated to all of the slaves during
the next propagation. For this reason, MIT recommends that you back
up your Kerberos database regularly. Because the master KDC is
continuously dumping the database to a file in order to propagate it
to the slave KDCs, it is a simple matter to have a cron job
periodically copy the dump file to a secure machine elsewhere on your
network. (Of course, it is important to make the host where these
backups are stored as secure as your KDCs, and to encrypt its
transmission across your network.) Then if your database becomes
corrupted, you can load the most recent dump onto the master KDC.
(See <a class="reference internal" href="database.html#restore-from-dump"><em>Restoring a Kerberos database from a dump file</em></a>.)</p>
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<li><a class="reference internal" href="#">Backups of secure hosts</a><ul>
<li><a class="reference internal" href="#backing-up-the-kerberos-database">Backing up the Kerberos database</a></li>
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<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="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 current"><a class="current reference internal" href="">Backups of secure hosts</a><ul class="simple">
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<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="admin_commands/index.html">Administration programs</a></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>
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<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="../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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