Redundant servers ???

[Jim Reid]

>>>>> "Barry" == Barry Margolin <barmar at bbnplanet.com> writes:

    Barry> I don't see why this would be more reliable.  It's just a
    Barry> different way to keep the servers in sync.
    >>
    Barry> It means you'll have to do extra work to get it going.  DNS
    Barry> already provides automatic synchronization via zone
    Barry> transfers, periodic refreshes and the NOTIFY protocol, and
    Barry> you'll need to replicate that functionality in your rsync
    Barry> mechanism.
    >>  In fact it's worse than that. You have to go through all sorts
    >> of contortions to try to switch *off* those mechanisms if
    >> you're using something like rsync to keep the server contents
    >> sychronised. For instance primary server #1 won't be too happy
    >> at getting a NOTIFY from primary server #2 when it loads a new
    >> copy of the zone.

    Barry> It will just ignore it, perhaps logging a warning.  No big
    Barry> deal.

It's true that the name server will ignore the NOTIFYs and will log a
warning. However if someone/something is keeping a close eye on the
logs, that warning message can lead to pagers going off and people
getting hauled out of bed at 3 am..... :-(