kea-lfc(8) 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 file.


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.


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


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