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+Environment variables
+=====================
+
+The following environment variables can be used during runtime:
+
+**KRB5_CONFIG**
+    Main Kerberos configuration file.  Multiple filenames can be
+    specified, separated by a colon; all files which are present will
+    be read.  (See :ref:`mitK5defaults` for the default path.)
+
+**KRB5_KDC_PROFILE**
+    KDC configuration file.  (See :ref:`mitK5defaults` for the default
+    name.)
+
+**KRB5_KTNAME**
+    Default keytab file name.  (See :ref:`mitK5defaults` for the
+    default name.)
+
+**KRB5_CLIENT_KTNAME**
+    Default client keytab file name.  (See :ref:`mitK5defaults` for
+    the default name.)
+
+**KRB5CCNAME**
+    Default name for the credentials cache file, in the form *type*\:\
+    *residual*.  The type of the default cache may determine the
+    availability of a cache collection.  For instance, a default cache
+    of type ``DIR`` causes caches within the directory to be present
+    in the global cache collection.
+
+**KRB5RCACHETYPE**
+    Default replay cache type.  Defaults to ``dfl``.  A value of
+    ``none`` disables the replay cache.
+
+**KRB5RCACHEDIR**
+    Default replay cache directory.  (See :ref:`mitK5defaults` for the
+    default location.)
+
+**KPROP_PORT**
+    :ref:`kprop(8)` port to use.  Defaults to 754.
+
+**KRB5_TRACE**
+    Filename for trace-logging output (introduced in release 1.9).
+    For example, ``env KRB5_TRACE=/dev/stdout kinit`` would send
+    tracing information for kinit to ``/dev/stdout``.  Some programs
+    may ignore this variable (particularly setuid or login system
+    programs).