[Dnsmasq-discuss] Re: Dnsmasq-discuss] Would like to use dnsmasq for cluster booting

[Joe Landman]

<sigh>

s/nbgrub/pxegrub/*

Works.  Thanks.

Simon Kelley wrote:
> Joe Landman wrote:
> 
>> Hi folks:
>>
>>   I have been using dnsmasq for a few years within a simple network 
>> and some linux clusters.  With the inclusion of the DHCP bits, and the 
>> bootp bits, suddenly the idea of replacing that fine bit of work known 
>> as the ISC DHCP server seems possible (and quite likely).
>>
>>   I have managed to serve some pxelinux.0 files quite nicely.  What I 
>> want to do is to serve the nbgrub (network boot grub) bits, and have 
>> it read its menu.lst.
>>
>>   To make this happen, I need to set option T150 to (nd)/menu.lst .  I 
>> am doing this via
>>
>>     dhcp-option=150,"(nd)/menu.lst"
>>
>>   So after setting this up, nbgrub does boot, but the logs have
>>
>> Sep  3 07:40:55 autoinst dnsmasq[11915]: DHCPREQUEST(eth0) 
>> 192.168.32.34 00:11:09:cc:d3:e8
>> Sep  3 07:40:55 autoinst dnsmasq[11915]: DHCPACK(eth0) 192.168.32.34 
>> 00:11:09:cc:d3:e8
>> Sep  3 11:40:55 autoinst in.tftpd[11946]: RRQ from 192.168.32.34 
>> filename /nbgrub
>> Sep  3 11:40:55 autoinst in.tftpd[11946]: tftp: client does not accept 
>> options
>> Sep  3 11:40:55 autoinst in.tftpd[11947]: RRQ from 192.168.32.34 
>> filename /nbgrub
>>
>>   and then nothing (e.g. no menu.lst request), and the grub just hangs 
>> there.
>>
>>   What am I doing wrong?  Will dnsmasq work this way or can it serve 
>> only pxelinux like bits?
>>
>>   Here are my relevant dnsmasq.conf options:
>>
>>     domain=boot.scalableinformatics.com
>>     dhcp-range=192.168.32.1,192.168.32.128
>>     dhcp-boot=/nbgrub,autoinst,192.168.32.217
>>     dhcp-option=150,"(nd)/menu.lst"
>>
>>   Thanks!
>>
>> Joe
>>
>>
> 
> That should all work: the only obvious (potential) problem is the quotes 
> in the dhcp-option line. They are not strictly necessary, and will break 
> things on earlier dnsmasq versions. They should be OK with 2.22 and 
> 2.23, at least.
> 
> Can you use tcpdump or ethereal to grab the complete DHCPREQUEST and 
> DHCPACK packets and send them to me off list? That's by far the easiest 
> way to see if the problem is dnsmasq configuration or not.
> 
> Cheers,
> 
> Simon.
> 

-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
web  : http://www.scalableinformatics.com
phone: +1 734 786 8423
fax  : +1 734 786 8452
cell : +1 734 612 4615