Re: CentOS 6 and pxeboot

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On Tue, 11 Apr 2017, m.roth@xxxxxxxxx wrote:

Hi, folks,

  We've been using pxeboot to pull up a menu, to build or rebuild
machines for years. We have this new server, and it fails. Times out.
What's happening is that it tries in this order
       .../pxelinux.cfg/b8945908-d6a6-41a9-611d-74a6ab80b83d
	.../pxelinux.cfg/01-88-99-aa-bb-cc-dd
	.../pxelinux.cfg/C0A8025B
	.../pxelinux.cfg/C0A8025
	.../pxelinux.cfg/C0A802
	.../pxelinux.cfg/C0A80
	.../pxelinux.cfg/C0A8
	.../pxelinux.cfg/C0A
	.../pxelinux.cfg/C0
	.../pxelinux.cfg/C
	.../pxelinux.cfg/default

The first are MAC addresses, etc. I want it to pull default. It takes
*minutes* to time out each option, so after a dozen or 15 min, when it
gets to defaul, tftp has timed it out.

I've never seen that sort of delay before, but it's tough to strace an PXE environment. :-)

Now, our dhcpd config has this for pxeboot:
group
{
       allow booting;
       allow bootp;
       filename "gpxelinux.0";
       option-209 =  "pxelinux.cfg/default";
       option subnet-mask 255.255.254.0;
       option routers  <our router>;
       default-lease-time 172800; # 2 days.
       max-lease-time 432000; # 5 days.

Do you have a next-server option that points to your tftp server? I've always hardcoded an IPv4 address into that setting:

group {
  # normal stuff
  next-server 10.11.12.13;
  filename "gpxelinux.0";
}

Also, in case you're ever interested, I've written a script that generates suitable IPv4-based filenames for pre-default usage:

  https://github.com/heinlein/pxehex

--
Paul Heinlein <> heinlein@xxxxxxxxxx <> http://www.madboa.com/
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