[H-GEN] named on RedHat 7.x

Robert Brockway robert at timetraveller.org
Thu Aug 8 03:55:16 EDT 2002


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On Thu, 8 Aug 2002, Ewan Edwards wrote:

> A colleague of mine has recently setup DNS on a RedHat box at home and
> has asked why the default setup seems to have 5 instances of named running

Normally a few copies are pre-forked to improve performance for remote
clients.  Apache & squid often do the same thing.

> from start up.  I don't yet know anything about configuring bind so I'm
> hoping some one on this list can help me answer the question.

> I assume that if there is no good reason to maintain 5 instances, the next
> question will be asking how to configure it to run, say, only one instance.

Unless he is managing a domain or needing a local caching dns server there
is no need to run _any_ copies of named.  If he is needing named I'd leave
it at 5 copies myself.  The performance overheads are negligable as any
un-needed apps will be swapped out eventually.

> I've had a look on the network here at a Solaris box and a HPUX box both
> running bind and seen that both have only the one instance running, so I

You seem to have many dns servers running :)  It is best to avoid running
daemons when they are un-needed.  They bind to a port and theoretically
can be exploitable.

> guess it isn't necessary to run multiple instances.

Cheers,
	-Rob

-- Robert Brockway B.Sc. email: robert at timetraveller.org  ICQ: 104781119
   Linux counter project ID #16440 (http://counter.li.org)
   "The earth is but one country and mankind its citizens" -Baha'u'llah


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