Officially, xCAT requires you to adopt Option1.
Option 2, if proxydhcp works for your target node. It's worth to make the
change to fit your requirement. It should not be hard.
Option 3 is workable if you can set the path of pxe configuration file for
each node to the external dhcpd in advance.
Thanks
Best Regards
----------------------------------------------------------------------
Wang Xiaopeng (王晓朋)
IBM China System Technology Laboratory
Tel: 86-10-82453455
Email: [email protected]
Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road,
Haidian District Beijing P.R.China 100193
From: Martin Tippmann <[email protected]>
To: [email protected]
Date: 2014/11/27 02:02
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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