The postscript is 'hardeths'
> On August 20, 2019 at 3:54 PM Kevin Keane <kke...@sandiego.edu> wrote: > > Remember that the DHCP in xCAT is quite substantially different from > "normal" enterprise DHCP, since it needs to only serve a very specific, > well-defined, set of computers (all of which normally will have static > reservations), except during discovery. > > I would simply use whatever the default value is. Or if you do want to > tweak it, go for a very long duration (to reduce traffic, even if it is only > by a tiny amount). > > The other big difference between Enterprise DHCP and xCAT DHCP is that, > because your xCAT environment is (or should be) very well-defined, it's very > unlikely that the DHCP server just crashes out of the blue. If the DHCP > server crashes, you probably have a bigger problem. > > BTW, a 3 day lease time wouldn't be enough to protect against a weekend > outage. The lease time needs to be at least twice the longest expected outage. > > If you do want to protect against a DHCP failure anyway, you can do a few > things: > > - Configure an automatic restart with a cron script or the like. > - Configure the nodes to use a static IP address after bootup. There is a > node attribute to do that, but I don't recall what it is off the top of my > head. This is actually done in a postscript. > > _______________________________________________________________________ > Kevin Keane | Systems Architect | University of San Diego ITS | > kke...@sandiego.edu mailto:kke...@sandiego.edu > Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | > 619.260.6859 | Text: 760-721-8339 > > REMEMBER! No one from IT at USD will ever ask to confirm or supply your > password. > These messages are an attempt to steal your username and password. Please > do not reply to, click the links within, or open the attachments of these > messages. Delete them! > > > > > On Mon, Aug 19, 2019 at 11:06 PM Heckes Frank (CI/OSB4) via xCAT-user < > xcat-user@lists.sourceforge.net mailto:xcat-user@lists.sourceforge.net > > wrote: > > > > > > Hello all, > > > > > > > > I’ve a couple of questions concerning the dhcpd configuration of a > > cluster > > runining completely on stateless images. > > > > > > > > -1- What is ‘best’ choice for the value of the DHCPLEASE parameter > > to run > > a stateless cluster? > > > > In case of dhcpd failures is seems to be helpful assigning a > > higher value > > then the default for at least 3 days seems to reasonable in > > case the > > dhcpd crashes over the weekend and an automated > > check/restarted fails.(?) > > -2- Does my understanding (dhcpd.leases(5)) and experience is right > > that the leases stored > > in /var/lib/dhcpd/dhcpd.leases guarantee a persistent state > > during dhcpd restarts? > > > > > > > > Many thanks in advance. > > > > > > > > Cheers, > > > > -Frank Heckes > > > > _______________________________________________ > > xCAT-user mailing list > > xCAT-user@lists.sourceforge.net > > mailto:xCAT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > > _______________________________________________ > xCAT-user mailing list > xCAT-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcat-user >
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