there's a wiki article on this subject:
https://fedorahosted.org/cobbler/wiki/MultipleCobblerServerAddresses
i'm guessing that the DNS trick mentioned is alluding to setting up a couple
different 'views' in BIND with different A records for each subnet pointing to
the 'next-server' value used in your DHCPD config. even though i consider
myself a DNS guy, i think this option is a little too convoluted for my taste.
the Cobbler solution seems cleaner to me. basically you set the
'server-override' config to the IP/FQDN of the cobbler/PXE/kickstart server as
it's addressed on each VLAN/network. this value is set either at the profile
or system level.
if you can't accomplish your goal with either of the above, perhaps modifying
some of the python code in
/usr/lib/python${ver}/site-packages/cobbler(/modules) directories and or
snippets in /var/lib/cobbler/snippets would be an option. however, personally
i'd save that as a last resort.
HTH
byron
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, August 10, 2010 9:25 PM
To: [email protected]; [email protected]
Subject: Re: Cobbler on multi-segmented network.
Thank you
Ip helper is not an option and I have vlan tagging already set. I created dhcp
template for each subet and that's all working. Finally I have dhcp-tag setup
for dhcp and hosts are in correct group.
The only thing I need is a way to work with pxe and kickstart. I am thinking
that pxe might work with dhcp-tag but no clue how to do kickstart. What I
would like to see is a variable I can use for the tree in profile so that
install tree's ip changes base on vlan tag the host is coming from.
----- Original Message -----
From: [email protected]
<[email protected]>
To: cobbler mailing list <[email protected]>
Sent: Tue Aug 10 20:07:14 2010
Subject: Re: Cobbler on multi-segmented network.
On Tue, 10 Aug 2010 16:47:36 -0500, <[email protected]>
wrote:
> Hey
>
> I am wondering if anybody can give me a suggestion as to which way is
> best to proceed.
> I have a server on a multi-segment network. I.E. it has a lot of VLANs
> connected to it.
> On this server I installed cobbler. What I want to do is have each
> server that needs to be installed automatically pick the right
> pxe/kickstart options.
> I am not sure if there is a way to script this, without having a profile
> for each segment. I would prefer to avoid that and have a single "if
> then" structure in a template for the pxe menu and kickstart.
>
> Is there any variable that cobbler has an access to that I could use to
> do this? (for instance ability to read the IP of the host).
Are you using tagged vlans? Personally, I would not set cobbler up that
way, as it becomes a maintenance headache. If you're using Cisco hardware,
you can configure your switches to use the "ip helper" command to forward
layer 2 traffic to a layer 3 host, so you can do things like DHCP and PXE
across segments.
In your case, if you're using tagged vlans, you'll have to create a vlan
interface for every vlan you want to build things on, and configure dhcpd
networks for each of them in dhcpd.template (also add the vlan interface to
your dhcpd settings, /etc/sysconfig/dhcpd if you're using RHEL or similar).
Then you can use the dhcp tags variable to pin systems to a specific dhcp
network. The down side is, everytime you add a new network, you have to
update your dhcpd.template, settings, etc., thus the maintenance
headache.
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