[Beowulf] Disk less machines booted with static address fails on expired dhcp lease
tegner at renget.se
tegner at renget.se
Tue Oct 22 02:35:53 PDT 2019
Don't think it is bios related, the Dell workstations go down at the same time, while the supermicro server stay up. And these machines are booted in the same way. I have also confirmed that the time is related to the lease time I give in dhcpd.conf.
Haven't found anything in the logs, but now I start to suspect it has to do with how I let them boot, I use
would suspect it to work differently if I instead use static values here.
But then again, ip=dhcp is "easier", and why should it work on some machines, and not on others? And using infinite lease time seems to solve the issue (but a bit more "ugly").
On 22 October 2019 at 09:00:58 +02:00, Tony Brian Albers <tba at kb.dk> wrote:
> On Tue, 2019-10-22 at 08:39 +0200, <tegner at renget.se> wrote:
> > Hi,
> > have been using disk less machines extensively, and just recently
> > experienced a problem connected to the dhcp lease time.
> > Initial contact is over dhcp (tied to mac address), but once the
> > machines boot over the nfs exported root file system static ip is
> > used (with the same address as initially used by dhcp).
> > This strategy has previously worked without any issues, but recently,
> > when setting up a small experimental environment using older Dell
> > desktop machines I have noted that these machines fail when the lease
> > time for the dhcp server expires.
> > This ONLY happens on the desktop machines - the server grade machines
> > I have used this far are not affected.
> > By putting infinite lease time in dhcpd.conf the problem goes away -
> > but I still would like to understand why this happens on just some of
> > the machines.
> > Regards,
> > /jon
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> Hejsan Tegner,
> It could be something as stupid as BIOS power management shutting down
> the NIC to save electricity.
> But then again, it could be a hardware profile in the OS that doesn't
> let you keep using the static IP from the root FS.
> Nothing in the logs?
> Tony Albers - Systems Architect - IT Development
> Royal Danish Library, Victor Albecks Vej 1, 8000 Aarhus C, Denmark
> Tel: +45 2566 2383 - CVR/SE: 2898 8842 - EAN: 5798000792142
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