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<div class="section" id="environment-variables">
<h1>Environment variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">¶</a></h1>
<p>The following environment variables can be used during runtime:</p>
<dl class="docutils">
<dt><strong>KRB5_CONFIG</strong></dt>
<dd>Main Kerberos configuration file. Multiple filenames can be
specified, separated by a colon; all files which are present will
be read. (See <a class="reference internal" href="../mitK5defaults.html#mitk5defaults"><em>MIT Kerberos defaults</em></a> for the default path.)</dd>
<dt><strong>KRB5_KDC_PROFILE</strong></dt>
<dd>KDC configuration file. (See <a class="reference internal" href="../mitK5defaults.html#mitk5defaults"><em>MIT Kerberos defaults</em></a> for the default
name.)</dd>
<dt><strong>KRB5_KTNAME</strong></dt>
<dd>Default keytab file name. (See <a class="reference internal" href="../mitK5defaults.html#mitk5defaults"><em>MIT Kerberos defaults</em></a> for the
default name.)</dd>
<dt><strong>KRB5_CLIENT_KTNAME</strong></dt>
<dd>Default client keytab file name. (See <a class="reference internal" href="../mitK5defaults.html#mitk5defaults"><em>MIT Kerberos defaults</em></a> for
the default name.)</dd>
<dt><strong>KRB5CCNAME</strong></dt>
<dd>Default name for the credentials cache file, in the form <em>type</em>:<em>residual</em>. The type of the default cache may determine the
availability of a cache collection. For instance, a default cache
of type <tt class="docutils literal"><span class="pre">DIR</span></tt> causes caches within the directory to be present
in the global cache collection.</dd>
<dt><strong>KRB5RCACHETYPE</strong></dt>
<dd>Default replay cache type. Defaults to <tt class="docutils literal"><span class="pre">dfl</span></tt>. A value of
<tt class="docutils literal"><span class="pre">none</span></tt> disables the replay cache.</dd>
<dt><strong>KRB5RCACHEDIR</strong></dt>
<dd>Default replay cache directory. (See <a class="reference internal" href="../mitK5defaults.html#mitk5defaults"><em>MIT Kerberos defaults</em></a> for the
default location.)</dd>
<dt><strong>KPROP_PORT</strong></dt>
<dd><a class="reference internal" href="admin_commands/kprop.html#kprop-8"><em>kprop</em></a> port to use. Defaults to 754.</dd>
<dt><strong>KRB5_TRACE</strong></dt>
<dd>Filename for trace-logging output (introduced in release 1.9).
For example, <tt class="docutils literal"><span class="pre">env</span> <span class="pre">KRB5_TRACE=/dev/stdout</span> <span class="pre">kinit</span></tt> would send
tracing information for kinit to <tt class="docutils literal"><span class="pre">/dev/stdout</span></tt>. Some programs
may ignore this variable (particularly setuid or login system
programs).</dd>
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