David C. Rankin wrote:
Ken Schneider wrote:
David C. Rankin pecked at the keyboard and wrote:
Listmates,
How do you tell ssh to log in as machine x.y.z? With bind running a
single machine may be known as:
ftp.domain.com
mail.domain.com
machinename.domain.com
www.domain.com
When using ssh outbound from that box, how do you tell it to ssh as
machinename.domain.com and not mail.domain.com?
Thanks.
Would it really matter if all requests go to the same machine/(ip
address)?
No, this is just another of my anal retentive moments where I can't
understand why my machine wants to ssh out to the world as
mail.3111skyline.com. It's another of my inquisitively stupid "Why?"
questions. I mean, what logic on the box looks to bind dns and says, "I
want to be known as mail today? Hell, why not nemesis.3111skyline.com,
it real name? (Ur, Umm, the name of the box is probably at fault) I
should have called the son-of-a-bitch accommodating.3111skyline.com and
I wouldn't have to put up with this stuff.
I know it doesn't matter, but why?
Yes... long time sysadmins know to name all machines
using "meaningless" names (such as, at man universities,
a scheme such asnames of instruments, which may all be
related to a "master" machine named "orchestra"... or
in commercial environments, letters coding for function
and site, followed by a number. Example: whpcs023 = Warren
Technical Center, High Performance Computing Group,
server #23, or pcad0257 is Pontiac design center, CAD
workstation #257)... and then make more meaningful
names (such as www, smpd or pop) just aliases of the
neutral names in the DNS servers.
Sounds complicated, but it's actually easier,
especially when migrating, say, an old mail
server to a new mail server. Once everything
is ready, the DNS entries for the alternate
names are entered, and then the new DNS map
is "pushed" (forced distribution over the
network). Changeover is almost instantaneous --
even if the new mail server is physically
located at a distance from the old one (preventing
the old "swap network cables" trick)
Once in the habit of ALWAYS naming machines
with "neutral" names first, and making symbolic
names only by means of aliasing, you're soon in
the habit of ALWAYS keeping your alias maps up
to date regarding these important machines which
require these sorts of names.
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