Is it possible to over-ride DNS

Aaron Peterson aaron at
Mon May 19 16:52:37 PDT 2003

> On Mon, May 19, 2003 at 02:13:02PM -0700, Jonas wrote:
> >
> > We're going to move a site from one server to another. The
> > website is using our SSL cert running on a 3rd server. When
> > we change the DNS to point the domain name to the new server
> > we will run into problems if the DNS for the SSL server isn't
> > pointing to the new server immediately.
> >
> > Is it possible to enter the domain name in the host file or by
> > some other means make sure that the SSL server points to the
> > new server when the change occurs?
> Not if you want the rest of the world to be able to use it. If
> this is that you're talking about, drop the TTL
> on the A record to 1 minute about 36 hours before you're going
> to make the change, and when you're sure it's working on the new
> IP address, push it back up to 24 hours.
> You'll see increased DNS traffic during that period, but at
> least everything will work!

Or when I have the opportunity, I would tend to leave both servers up
and functional until the DNS change has taken effect.  you could do that
even if you do make the TTL changes above, and it would provide some
insurance that no matter where the DNS points at any moment in time
people will get the necessary page.  A couple days after the DNS change
has taken effect you could disable the old server.  just my 2 cents.

Aaron Peterson

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