83 lines
4.0 KiB
Groff
83 lines
4.0 KiB
Groff
.\" dhcpd.conf.5
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.\"
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.\" Copyright (c) 1997 The Internet Software Consortium.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of The Internet Software Consortium nor the names
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.\" of its contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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.\" CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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.\" CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" This software has been written for the Internet Software Consortium
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.\" by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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.\" Enterprises. To learn more about the Internet Software Consortium,
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.\" see ``http://www.isc.org/isc''. To learn more about Vixie
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.\" Enterprises, see ``http://www.vix.com''.
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.TH dhcpd.leases 5
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.SH NAME
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dhcpd.leases - DHCP client lease database
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.SH DESCRIPTION
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The Internet Software Consortium DHCP Server keeps a persistent
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database of leases that it has assigned. This database is a free-form
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ASCII file containing one valid declaration per lease. If more than
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one declaration appears for a given lease, the last one in the file is
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used. The file is written as a log, so this is not an unusual
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occurrance.
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.PP
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When dhcpd is first installed, there is no lease database. However,
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dhcpd requires that a lease database be present before it will start.
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To make the initial lease database, just create an empty file called
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DBDIR/dhcpd.leases.
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.PP
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In order to prevent the lease database from growing without bound, the
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file is rewritten from time to time. First, a temporary lease
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database is created and all known leases are dumped to it. Then, the
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old lease database is renamed DBDIR/dhcpd.leases~. Finally, the
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newly written lease database is moved into place.
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.PP
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There is a window of vulnerability where if the dhcpd process is
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killed or the system crashes after the old lease database has been
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renamed but before the new one has been moved into place, there will
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be no DBDIR/dhcpd.leases. In this case, dhcpd will refuse to start,
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and will require manual intervention. \fBDO NOT\fR simply create a
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new lease file when this happens - if you do, you will lose all your
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old bindings, and chaos will ensue. Instead, rename
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DBDIR/dhcpd.leases~ to DBDIR/dhcpd.leases, restoring the old, valid
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lease file, and then start dhcpd. This guarantees that a valid lease
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file will be restored.
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.SH FORMAT
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The format of the lease declarations is not currently documented.
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.SH FILES
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.B DBDIR/dhcpd.leases
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.SH SEE ALSO
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dhcpd(8), dhcp-options(5), dhcpd.conf(5), RFC2132, RFC2131.
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.SH AUTHOR
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.B dhcpd(8)
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was written by Ted Lemon <mellon@vix.com>
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under a contract with Vixie Labs. Funding
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for this project was provided by the Internet Software Corporation.
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Information about the Internet Software Consortium can be found at
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.B http://www.isc.org/isc.
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