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Environment variables
=====================
The following environment variables can be used during runtime:
**KRB5_CONFIG**
Main Kerberos configuration file. (See :ref:`mitK5defaults` for
the default name.)
**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).
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