FYI. There is a site table attribute called: dhcpsetup, if it is set to
'n', then it will skip the dhcp setup process for the node in the nodeset
cmd. You can shut down the dhcpd and set site.dhcpsetup to 'n'.
Ling
Ling Gao
Poughkeepsie Unix Development Lab
IBM Systems and Technology Group
Internal: T/L 293-5692
External: [email protected], 845-433-5692
"I never worry about the future. It comes soon enough." --- Albert
Einstein
From: Jarrod Johnson <[email protected]>
To: xCAT Users Mailing list <[email protected]>
Date: 12/01/2014 09:23 AM
Subject: Re: [xcat-user] xCAT with external DHCP and PXE via
proxyDHCP
I actually have a plan for confluent to be able to resolve this precise
scenario without so much awkwardness in the future.
In terms of *today*, I think c or b would be the easiest option if a is
deemed impossible. The punchline is to try to boot xNBA (efi or kpxe) and
then point ipxe at http://${next-server}/tftpboot/xcat/xnba/nodes/n12 or
http://${next-server}/tftpboot/xcat/xnba/nodes/n12.uefi , depending on how
your nodes boot.
Switching between netboot payloads shouldn't require changing dhcp on the
fly (unless pushing iSCSI parameters down or similarly exotic stuff),
changing to not netboot at all would potentially break.
The scenario to imitate (can be adjusted according to your circumstances):
if option user-class-identifier = "xNBA" and option client-architecture
= 00:00 {
supersede server.filename = "http://$
{next-server}/tftpboot/xcat/xnba/nodes/n12";
} elsif option user-class-identifier = "xNBA" and option
client-architecture = 00:09 {
supersede server.filename = "http://$
{next-server}/tftpboot/xcat/xnba/nodes/n12.uefi";
} elsif option client-architecture = 00:07 {
supersede server.filename = "xcat/xnba.efi";
} elsif option client-architecture = 00:00 {
supersede server.filename = "xcat/xnba.kpxe";
}
Jarrod Johnson
Systems Management Architect
Lenovo
-----Original Message-----
From: Martin Tippmann [mailto:[email protected]]
Sent: Wednesday, November 26, 2014 12:40 PM
To: [email protected]
Subject: [xcat-user] xCAT with external DHCP and PXE via proxyDHCP
Hi,
We plan to deploy xCAT on a network where DHCP is already configured and
is out of our control. There is no documentation regarding this use case
in the xCAT documentation...
There is a proxydhcp-xcat binary through but after reading through the
source it looks like it's strictly for Windows deployments and not
compatible for Linux...
Does that mean using xCAT for deploying Linux via PXE with proxyDHCP is
unsupported? As far as I've understood the architecture usally a mandatory
dhcpd is running on the master and this dhcpd does DHCP for IP-addresses
and for PXE.
So what are my choices? Would love to get someback on these options:
a) Disabling external DHCP and using dhcpd on the xCAT master - I'd like
to avoid that but this would work I assume.
b) Using proxyDHCP for PXE while using the external DHCP for IP assignment
- could be make working if I patch proxydhcp-xcat heavily (or run a
dnsmasq that needs to manually configured) and disable dhcpd on the xCAT
master?
c) Change external DHCP settings to emulate PXE settings for xCAT. And
disable dhcpd on the master completly. I assume this does not work because
it's breaks switching images? Or does pointing to a general iPXE image
would solve the problem?
d) Doing something entirely different.. the machines are Dell R720 and
they support also booting directly via iSCSI and other goodies I've yet to
learn about... but there appears to be no support from xCAT for anything
beyond PXE for stateless images?
I'd like to have b) working without much needs to maintain a patch..
is this realistic? If c) works everything would be fine, too.
Thanks for any hints!
regards
Martin
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