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Suzanne Goldlust 2021-10-18 18:41:44 +00:00 committed by Thomas Markwalder
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commit e5f65b05e4
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doc/sphinx/arm/lfc.rst
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@ -10,7 +10,7 @@ Overview
======== ========
``kea-lfc`` is a service process that removes redundant information from ``kea-lfc`` is a service process that removes redundant information from
the files used to provide persistent storage for the Memfile database the files used to provide persistent storage for the memfile database
backend. This service is written to run as a standalone process. backend. This service is written to run as a standalone process.
While ``kea-lfc`` can be started externally, there is usually no need to While ``kea-lfc`` can be started externally, there is usually no need to
@ -55,17 +55,17 @@ for input, write its output, and perform its bookkeeping:
- ``input`` — before the DHCP server invokes ``kea-lfc``, it moves - ``input`` — before the DHCP server invokes ``kea-lfc``, it moves
the current lease file here and then calls ``kea-lfc`` with this file. the current lease file here and then calls ``kea-lfc`` with this file.
- ``output`` — This is the temporary file where ``kea-lfc`` writes the - ``output`` — this is the temporary file where ``kea-lfc`` writes the
leases. Once the file has finished writing, it will be moved to the leases. Once the file has finished writing, it is moved to the
finish file (see below). ``finish`` file (see below).
- ``finish`` — This is another temporary file ``kea-lfc`` uses for - ``finish`` — this is another temporary file ``kea-lfc`` uses for
bookkeeping. When ``kea-lfc`` completes writing the output file, it bookkeeping. When ``kea-lfc`` completes writing the ``output`` file, it
moves the output to this file name. After ``kea-lfc`` finishes deleting the moves the contents to the file of this name. After ``kea-lfc`` finishes deleting the
other files (previous and input), it moves this file to the previous other files (``previous`` and ``input``), it moves this file to the ``previous``
lease file. By moving the files in this fashion, the ``kea-lfc`` and lease file. By moving the files in this fashion, ``kea-lfc`` and
the DHCP server processes can determine the correct file to use even the DHCP server processes can determine the correct file to use even
if one of the processes were interrupted before completing its task. if one of the processes is interrupted before completing its task.
There are several additional arguments, mostly for debugging purposes. There are several additional arguments, mostly for debugging purposes.
``-d`` sets the logging level to debug. ``-v`` and ``-V`` print out ``-d`` sets the logging level to debug. ``-v`` and ``-V`` print out