[Beowulf] SATA II - PXE+NFS - diskless compute nodes
landman at scalableinformatics.com
Tue Dec 12 18:26:19 PST 2006
Simon Kelley wrote:
> Joe Landman wrote:
>>>> I would hazard that any DHCP/PXE type install server would struggle
>>>> with 2000 requests (yes- you arrange the power switching and/or
>>>> reboots to stagger at N second intervals).
>> fwiw: we use dnsmasq to serve dhcp and handle pxe booting. It does a
>> marvelous job of both, and is far easier to configure (e.g. it is less
>> fussy) than dhcpd.
> Joe, you might like to know that the next release of dnsmasq includes a
> TFTP server so that it can do the whole job. The process model for the
> TFTP implementation should be well suited to booting many nodes at once
> because it multiplexes all the connections on the same process. My guess
> is that will work better then having inetd fork 2000 copies of tftpd,
> which is what would happen with traditional TFTP servers.
I am glad to hear this. I haven't found a case that ISC DHCP does a
better job than dnsmasq for our clusters: the former is hard to
configure properly; it is quite fussy. Add in that we don't need to
configure bind on the cluster (really doesn't make much sense in most
cases, unless you are doing some sort of fail-over cluster config) when
we use dnsmasq... this is a good tool.
We haven't explicitly enabled it in our Rocks roll as a default option,
but we typically turn off bind and the local dhcp server there as this
does a much better job. For our non-rocks units, we simply use this by
Great job 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
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