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<h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
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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"><span class="std std-ref">Adding principals to keytabs</span></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 replica 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
replicas 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 replica 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"><span class="std std-ref">Restoring a Kerberos database from a dump file</span></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="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 current"><a class="current reference internal" href="#">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"><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>
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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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