On Thu, Apr 28, 2011 at 23:14:35 -0700,
Toshio Kuratomi <a.badger(a)gmail.com> wrote:
Do CNAMES in our internal network propogate instantly or does it
the DNS TTL? If the latter, I could see us having problems with things like
db servers where we need to switch over from one db server to another and we
really can't have any requests going to the old host.
I don't know if bind has a similar feature, but tinydns allows you to have
TTLs set to expire at a particular time. So that as you get closer to the
change over time, the TTLs will get shorter. That way everyone (barring evil
ISPs that rewrite TTLs) should see the change right when it happens.