[mdlug] Server maintenance

[Robert Citek]

On Nov 17, 2012 8:48 AM, "Michael Mol" <mikemol at gmail.com> wrote:
>
> On Nov 17, 2012 6:41 AM, "Jay Nugent" <jjn at nuge.com> wrote:
> >
> > Greets,
> >
> >
> > On Fri, 16 Nov 2012, Carl T. Miller wrote:
> >
> >> s/propagating/promulgating/
> >>
> >> ; -)
> >>
> >> c
> >>
> >>
> >> On 11/16/2012 05:38 PM, Mat Enders wrote:
> >>>
> >>>  Hello all I will be taking down the MDLUG web and email server within
> the
> >>>  next ten minutes.  I hope to have it back up with 2-3 hours.  This
> going
> >>>  to
> >>>  involve a change to DNS so part of it will be that propagating.
> >
> >
> >    DNS *NEVER* propogates.  You plan ahead, reduce the TTL/Expire to
just
> a couple hours.  Once that *old* TTL has passed, begin your maintenance.
> Sheesh!  I teach this basic stuff every day yet see this mistake over and
> over and over...
>
> That works in theory, but it rather sucks when caching resolvers override
> (or simply ignore!) TTL.
>
> Best-effort "safe" assumption is 24 hrs, regardless of how low you set
your
> TTLs.

Yes, I've experienced that, too.  Frustrating.   For web traffic I've
worked around this issue using a reverse proxy.   What other workarounds
have folks used?

Regards,
- Robert