Hi Tory,
This is a little bit late, but I've been handling the issue of multiple
next-servers by using Cheetah templating code in dhcp.template. I started
with 3 data centers -- A, B, and C -- which all had a cobbler instance
repliacted from a master cobbler server (the only one with cobbler-web).
On each cobbler server, I defined a unique $tag_pattern to be matched
against each system object's dhcp_tag.
If CobblerA recognized that a system object's dhcp_tag matched its
$tag_pattern, it created a dhcpd host definition with the appropriate
next-server (pulled from CobblerA 's /etc/cobbler/settings).
Systems that were not set with netboot-enable=True or did not match the
$tag_pattern were skipped. This resulted in a clean dhcpd.conf, containing
only the host definitions relevant for that network.
It would be a simple matter to update my template for multi-homed Cobbler
servers with a Cheetah if statement that examined the system object's
gateway and assigned a different next-server value.
Here's my dhcp.template. If you're still struggling with too much
complexity and/or uncertainty, I hope this helps.
# Cobbler managed dhcpd.conf file
#
# generated from cobbler dhcp.conf template ($date)
# Do NOT make changes to /etc/dhcpd.conf. Instead, make your changes
# in /etc/cobbler/dhcp.template, as /etc/dhcpd.conf will be
# overwritten.
#
# ******************************************************************
authoritative;
allow booting;
allow bootp;
option domain-name "example.com";
option domain-name-servers 10.10.148.12;
option ntp-servers 10.10.148.12;
option routers 10.10.148.1;
ddns-update-style interim;
default-lease-time 10800;
max-lease-time 10800;
log-facility local4;
key ddns_key {
algorithm hmac-md5;
secret "XXXXXXXXXXXXXXXXXXXXXX";
}
subnet 10.10.148.0 netmask 255.255.252.0 {
option routers 10.10.148.1;
option domain-name-servers 10.10.148.12;
option domain-name "example.com";
option subnet-mask 255.255.252.0;
filename "/pxelinux.0";
next-server $next_server;
}
# For kicking OpenStack Compute nodes
subnet 192.168.241.0 netmask 255.255.255.0 {
option routers 192.168.241.1;
option domain-name-servers 192.168.241.10;
option domain-name "example.com";
option subnet-mask 255.255.255.0;
filename "/pxelinux.0";
next-server 192.168.241.10;
}
#import re
#set $tag_pattern = $re.compile("^cobbler_A")
#for dhcp_tag in $dhcp_tags.keys():
#unless $tag_pattern.match($dhcp_tag) # <-- add the if statement
#continue # after this line
to
#end unless # determine
next_server
# group for Cobbler DHCP tag: $dhcp_tag
group {
#for mac in $dhcp_tags[$dhcp_tag].keys():
#set iface = $dhcp_tags[$dhcp_tag][$mac]
host $iface.name {
hardware ethernet $mac;
#if $iface.ip_address:
fixed-address $iface.ip_address;
#end if
#if $iface.hostname:
option host-name "$iface.hostname";
#end if
#if $iface.subnet:
option subnet-mask $iface.netmask;
#end if
#if $iface.gateway:
option routers $iface.gateway;
#end if
filename "$iface.filename";
## Cobbler defaults to $next_server, but some users
## may like to use $iface.system.server for proxied setups
next-server $iface.next_server;
}
#end for
}
#end for
On Thu, May 5, 2016 at 9:50 PM, Tory M Blue <[email protected]> wrote:
> Okay just circling back.
>
> So some of this was my misunderstanding and my days of trying to
> modify the "template" (it's not the actual kickstart file), as well as
> mis understanding what Cobbler's role in this whole thing was. So what
> I was after was not really even possible, thanks to NACC on the
> #cobbler irc channel, he was able to straighten out my terminology.
>
> So ya Cobbler has no idea and never will (unless you go static!) what
> my clients IP is. This is really an anaconda/pxe issue and not
> Cobbler, Cobbler is creating the kickstart files and stuff out of my
> template, so really I need to attack this from a different angle.. So
> this was much more of me not understanding Cobbler's role in my
> pxebooting process.
>
> NACC found me some cool stuff via the pxelinux and some stuff I can do
> there to get the right information (prevent PXE from traversing the
> network)..
>
> May not get me 100%, but I'm a much better person now that my
> misconceptions have been cleared up.
>
> Sorry Cobbler this was on me, not you!!
>
> Thanks for everyones assistance!
>
> Tory
> _______________________________________________
> cobbler mailing list
> [email protected]
> https://lists.fedorahosted.org/admin/lists/[email protected]
>
--
\*..+.-
--Greg Chavez
+//..;};
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