I'm trying to troubleshoot an LTSP (the new LTSP-PNP) client boot
problem under Quantal.
The problem is that the LTSP client, after successfully getting DHCP
assignments, fails to download the pxelinux boot image. It reports
"PXE-E32 TFTP open timeout."
I can also run this on the server itself to get a similar failure:
$ cd /tmp
$ tftp 192.168.1.102 -v -m binary -c get ltsp/i386/pxelinux.0 mode set
to octet
Connected to 192.168.1.102 (192.168.1.102), port 69
getting from 192.168.1.102:/var/lib/tftpboot/ltsp/i386/pxelinux.0 to
pxelinux.0 [octet]
Transfer timed out.
A critical note: This is using the default network-manager to configure
the network interface (using the default DHCP configuration).
Apparently network-manager also runs or works with dnsmasq, which
provide DHCP and TFTP servers.
When I had TFTP and DHCP errors booting the client under LTSP5 and
Precise, I learned that the usual work-around was to configure the
network interface(s) via /etc/network/interfaces. I think this solved
some sort of a timing problem with the relevant services during bootup.
But that approach is apparently deprecated under Quantal and LTSP-PNP.
In fact, I can use that approach to get the client to boot successfully,
but it introduces a new problem on server and client: DNS resolution
fails. This happens because the use of /etc/network/interfaces uses, I
think, ifup (or something related) to configure network interfaces
instead of network-manager, but now network-manager works with dnsmasq
to provide DNS resolution.
I can fix the DNS resolution problem by creating
/etc/resolvconf/resolv.conf.d/tail with contents:
nameserver (my nameserver 1)
nameserver (my nameserver 2)
But instead of patching up the old approach, I'd like to get the new
approach working right. But I don't know enough to move ahead with
troubleshooting, and no one on the LTSP mail list has been able to put a
finger on the problem yet, so I'm putting it in front of a different set
of eyes here.
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