Cy Schubert
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<title>Backups of secure hosts — MIT Kerberos Documentation</title>
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<h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
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<section id="backups-of-secure-hosts">
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<h1>Backups of secure hosts<a class="headerlink" href="#backups-of-secure-hosts" title="Link to this heading">¶</a></h1>
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<p>When you back up a secure host, you should exclude the host’s keytab
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file from the backup. If someone obtained a copy of the keytab from a
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backup, that person could make any host masquerade as the host whose
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keytab was compromised. In many configurations, knowledge of the
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host’s keytab also allows root access to the host. This could be
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particularly dangerous if the compromised keytab was from one of your
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KDCs. If the machine has a disk crash and the keytab file is lost, it
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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>.)
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If you are unable to exclude particular files from backups, you should
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ensure that the backups are kept as secure as the host’s root
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password.</p>
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<section id="backing-up-the-kerberos-database">
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<h2>Backing up the Kerberos database<a class="headerlink" href="#backing-up-the-kerberos-database" title="Link to this heading">¶</a></h2>
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<p>As with any file, it is possible that your Kerberos database could
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become corrupted. If this happens on one of the replica KDCs, you
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might never notice, since the next automatic propagation of the
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database would install a fresh copy. However, if it happens to the
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primary KDC, the corrupted database would be propagated to all of the
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replicas during the next propagation. For this reason, MIT recommends
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that you back up your Kerberos database regularly. Because the primary
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KDC is continuously dumping the database to a file in order to
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propagate it to the replica KDCs, it is a simple matter to have a cron
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job periodically copy the dump file to a secure machine elsewhere on
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your network. (Of course, it is important to make the host where
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these backups are stored as secure as your KDCs, and to encrypt its
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transmission across your network.) Then if your database becomes
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corrupted, you can load the most recent dump onto the primary KDC.
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(See <a class="reference internal" href="database.html#restore-from-dump"><span class="std std-ref">Dumping and loading a Kerberos database</span></a>.)</p>
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<h2>On this page</h2>
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<ul>
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<li><a class="reference internal" href="#">Backups of secure hosts</a><ul>
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<li><a class="reference internal" href="#backing-up-the-kerberos-database">Backing up the Kerberos database</a></li>
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</ul>
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</li>
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</ul>
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<br/>
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<h2>Table of contents</h2>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="../user/index.html">For users</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">For administrators</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="install.html">Installation guide</a></li>
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<li class="toctree-l2"><a class="reference internal" href="conf_files/index.html">Configuration Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="realm_config.html">Realm configuration decisions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="database.html">Database administration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="dbtypes.html">Database types</a></li>
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<li class="toctree-l2"><a class="reference internal" href="lockout.html">Account lockout</a></li>
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<li class="toctree-l2"><a class="reference internal" href="conf_ldap.html">Configuring Kerberos with OpenLDAP back-end</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appl_servers.html">Application servers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="host_config.html">Host configuration</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">Backups of secure hosts</a></li>
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<li class="toctree-l2"><a class="reference internal" href="pkinit.html">PKINIT configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="otp.html">OTP Preauthentication</a></li>
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<li class="toctree-l2"><a class="reference internal" href="spake.html">SPAKE Preauthentication</a></li>
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<li class="toctree-l2"><a class="reference internal" href="dictionary.html">Addressing dictionary attack risks</a></li>
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<li class="toctree-l2"><a class="reference internal" href="princ_dns.html">Principal names and DNS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="enctypes.html">Encryption types</a></li>
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<li class="toctree-l2"><a class="reference internal" href="https.html">HTTPS proxy configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="auth_indicator.html">Authentication indicators</a></li>
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<li class="toctree-l2"><a class="reference internal" href="admin_commands/index.html">Administration programs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../mitK5defaults.html">MIT Kerberos defaults</a></li>
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<li class="toctree-l2"><a class="reference internal" href="env_variables.html">Environment variables</a></li>
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<li class="toctree-l2"><a class="reference internal" href="troubleshoot.html">Troubleshooting</a></li>
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<li class="toctree-l2"><a class="reference internal" href="advanced/index.html">Advanced topics</a></li>
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<li class="toctree-l2"><a class="reference internal" href="various_envs.html">Various links</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="../appdev/index.html">For application developers</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../plugindev/index.html">For plugin module developers</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../build/index.html">Building Kerberos V5</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../basic/index.html">Kerberos V5 concepts</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../formats/index.html">Protocols and file formats</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../mitK5features.html">MIT Kerberos features</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../build_this.html">How to build this documentation from the source</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../about.html">Contributing to the MIT Kerberos Documentation</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../resources.html">Resources</a></li>
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<div class="right" ><i>Release: 1.22.2</i><br />
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