DHCP + ldap

Richard Pijnenburg richard at softwaredev.nl
Sat May 15 15:11:15 UTC 2010

On Tue, 11 May 2010 21:30:15 +0200, Richard Pijnenburg
<richard at softwaredev.nl> wrote:
> On Tue, 11 May 2010 12:17:31 -0700, "David W. Hankins"
<dhankins at isc.org>
> wrote:
>> On Tue, May 11, 2010 at 09:33:48AM +0200, Richard Pijnenburg wrote:
>>> I've been doing some more work with it.
>>> I can define the hosts on the fly, but the subnets need to be
>>> before starting the dhcp server.
>>> Adding a subnet to the shared network while the dhcp server is running
> it
>>> won't see it.
>>> I hoped this could be different, or is it not possible due to the
> design
>>> of dhcpd?
>> My understanding of the LDAP patch (this should be true of the manual
>> patch as well as what we committed to 4.2.0b1) is that it does not
>> query the LDAP database during runtime, as that would be very difficult
>> with the particular way the DHCP server is architected currently, but
>> rather uses the LDAP database to build a dhcpd config at startup.
>> More or less LDAP is being used as an "include."  Literally, actually,
>> the LDAP related sources in dhcpd produce text to pass into the config
>> parser at startup.
>> So the configuration has to be in the LDAP database at the time the
>> server starts, and after making changes to LDAP the server must be
>> restarted.  So far as I'm aware, this applies to host records as
>> well as subnets.
>> Would this explain the disparity in function you were seeing between
>> the 4.2.0b1 and 4.1.1+patch server you tested?  When you started the
>> 4.1.1 server that constituted a restart?
> Hi David,
> I've restarted the 4.2.0b1 version multiple times.
> Just as a test i've removed my host definitions, started the dhcp
> Started the client and didn't get an IP.
> Added the host definition and i got an IP.
> Seems that the subnet defs are loaded when starting the dhcp server.
> The hosts are looked up dynamic.
> This can also be set to static, but seems it only counts for host defs.
> in the 4.2.0b1 version the error is that it finds the details to send,
> doesn't send them to the client.
> With the same ldap database i went to 4.1.1 and worked instantly.
> Also the logging to the file doesn't work + 2 rules are giving compile
> errors when the DEBUG option is enabled.
> Best regards,
> Richard

Hi David,

I haven't seen any replies yet. For now this solution works but i wonder
if this process will ever change?
I'm also wondering if there are plans to make a Mysql patch because it's
more common ( imho ) then ldap.



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