mir/isc-dhcp
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/dhcp synced 2025-08-29 13:28:14 +00:00
Code Issues Releases Wiki Activity

Clean up some problems.

Browse Source
This commit is contained in:
Ted Lemon 2001-01-25 08:34:57 +00:00
parent d83e416e5c
commit 43d5ca997f
1 changed files with 8 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
server/dhcpd.leases.5
View File

@ -29,24 +29,17 @@ for a given lease, the last one in the file is the current one.
When dhcpd is first installed, there is no lease database. However, When dhcpd is first installed, there is no lease database. However,
dhcpd requires that a lease database be present before it will start. dhcpd requires that a lease database be present before it will start.
To make the initial lease database, just create an empty file called To make the initial lease database, just create an empty file called
DBDIR/dhcpd.leases. DBDIR/dhcpd.leases. You can do this with:
.PP
.nf
touch DBDIR/dhcpd.leases
.fi
.PP .PP
In order to prevent the lease database from growing without bound, the In order to prevent the lease database from growing without bound, the
file is rewritten from time to time. First, a temporary lease file is rewritten from time to time. First, a temporary lease
database is created and all known leases are dumped to it. Then, the database is created and all known leases are dumped to it. Then, the
old lease database is renamed DBDIR/dhcpd.leases~. Finally, the old lease database is renamed DBDIR/dhcpd.leases~. Finally, the
newly written lease database is moved into place. newly written lease database is moved into place.
.PP
There is a window of vulnerability where if the dhcpd process is
killed or the system crashes after the old lease database has been
renamed but before the new one has been moved into place, there will
be no DBDIR/dhcpd.leases. In this case, dhcpd will refuse to start,
and will require manual intervention. \fBDO NOT\fR simply create a
new lease file when this happens - if you do, you will lose all your
old bindings, and chaos will ensue. Instead, rename
DBDIR/dhcpd.leases~ to DBDIR/dhcpd.leases, restoring the old, valid
lease file, and then start dhcpd. This guarantees that a valid lease
file will be restored.
.SH FORMAT .SH FORMAT
Lease descriptions are stored in a format that is parsed by the same Lease descriptions are stored in a format that is parsed by the same
recursive descent parser used to read the recursive descent parser used to read the
@ -149,6 +142,6 @@ dhcpd(8), dhcp-options(5), dhcpd.conf(5), RFC2132, RFC2131.
.B dhcpd(8) .B dhcpd(8)
was written by Ted Lemon <mellon@vix.com> was written by Ted Lemon <mellon@vix.com>
under a contract with Vixie Labs. Funding under a contract with Vixie Labs. Funding
for this project was provided by the Internet Software Corporation. for this project was provided by the Internet Software Consortium.
Information about the Internet Software Consortium can be found at Information about the Internet Software Consortium can be found at:
.B http://www.isc.org/isc. .B http://www.isc.org/