KEA-LFC(8)                            Kea                           KEA-LFC(8)

       kea-lfc - Lease File Cleanup process in Kea

       kea-lfc [-4|-6] [-c config-file] [-p pid-file] [-x previous-file]
               [-i copy-file] [-o output-file] [-f finish-file] [-v] [-V] [-W]
               [-d] [-h]

       The kea-lfc service process removes redundant information from the
       files used to provide persistent storage for the memfile data base
       backend. The service is written to run as a stand alone process. While
       it can be started externally, there is usually no need to do this. It
       will be run on a periodic basis by the Kea DHCP servers.

       The arguments are as follows:

           Verbose mode sets the logging level to debug. This is primarily for
           development purposes in stand-alone mode.

           version causes the version stamp to be printed.

           Version causes a longer form of the version stamp to be printed.

           Display the configuration report.

           Help causes the usage string to be printed.

       -4 | -6
           The protocol version of the lease files, must be one of 4 or 6.

           Configuration file including the configuration for kea-lfc process.
           It may also contain configuration entries for other Kea services.
           Currently kea-lfc gets all of its arguments from the command line,
           in the future it will be extended to get some arguments from the
           config file.

           PID file - When the kea-lfc process starts it attempts to determine
           if another instance of the process is already running by examining
           the pid file. If one is already running the new process is
           terminated. If one isn't running it writes its pid into the pid

           Previous or ex lease file - When kea-lfc starts this is the result
           of any previous run of kea-lfc. When kea-lfc finishes it is the
           result of this run. If kea-lfc is interrupted before completing,
           this file may not exist.

           Input or copy of lease file - Before the DHCP server invokes
           kea-lfc it will move the current lease file here and then call
           kea-lfc with this file.

           Output lease file - The temporary file kea-lfc should use to write
           the leases. Upon completion of writing this this file it will be
           moved to the finish file (see below).

           Finish or completion file - Another temporary file kea-lfc uses for
           bookkeeping. When kea-lfc completes writing the output file it
           moves it to this file name. After kea-lfc finishes deleting the
           other files (previous and input) it moves this file to previous
           lease file. By moving the files in this fashion the kea-lfc and the
           DHCP server processes can determine the correct file to use even if
           one of the processes was interrupted before completing its task.

       Kea comes with an extensive Kea User's Guide documentation that covers
       all aspects of running the Kea software - compilation, installation,
       configuration, configuration examples and many more. Kea also features
       a Kea Messages Manual, which lists all possible messages Kea can print
       with a brief description for each of them. Both documents are typically
       available in various formats (txt, html, pdf) with your Kea
       distribution. The on-line version is available at

       Kea source code is documented in the Kea Developer's Guide. It's
       on-line version is available at Please follow
       Developer's Guide link.

       Kea project website is available at:

       There are two mailing lists available for Kea project. kea-users
       (kea-users at is intended for Kea users, while kea-dev
       (kea-dev at is intended for Kea developers, prospective
       contributors and other advanced users. Both lists are available at The community provides best effort type of
       support on both of those lists.

       ISC provides professional support for Kea services. See for details.

       The kea-lfc process was first coded in January 2015 by the ISC Kea/DHCP

       kea-dhcp4(8), kea-dhcp6(8), kea-dhcp-ddns(8), kea-ctrl-agent(8), kea-
       admin(8), keactrl(8), perfdhcp(8), Kea Administrator's Guide.

           The Kea software has been written by a number of engineers working
           for ISC: Tomek Mrugalski, Stephen Morris, Marcin Siodelski, Thomas
           Markwalder, Francis Dupont, Jeremy C. Reed, Wlodek Wencel and Shawn
           Routhier. That list is roughly in the chronological order in which
           the authors made their first contribution. For a complete list of
           authors and contributors, see AUTHORS file.

       Copyright © 2015-2018 Internet Systems Consortium, Inc. ("ISC")

ISC Kea 1.4.0-P1                 July 11, 2018                      KEA-LFC(8)