On 2011-07-14 11:53, Gabriele Gabriele wrote:
Ok, may be I was not so clear to explain..
for example I have in my Master work site the our webmail
"webmail.mydomain.com" that when Master work site in UP the resolution
is 1.1.1.1 but if the master go down in My slave work site, my slave dns
resolv "webmail.mydomain.com" with 1.1.1.1 but that site is down..... So
it should resolv it with my backup/slave resolution 2.2.2.2
So, you have both DNS and HTTP servers on both 1.1.1.1 and 2.2.2.2?
And you want HTTP traffic to go to 1.1.1.1, except where it fails, than
it should switch to 2.2.2.2?
First, you do realize that you need to thing of some way to synchronize
those web servers. Second, if those are synchronized, why don't just put
both IP addresses and have some weak load balancing?
If you really want IP to change when server fails, this is bad:
a) takes time to propagate - after failure you still have to wait TTL
seconds before everyone uses new server.
b) puts more burden on your DNS servers and on clients, as you have to
put short TTLs on those names
c) you have to develop a way to test for primary's site failure. And
take care of false-positives.
d) you can't have normal master-slave setup, which leads to zone
maintenance problems.
Regards,
Torinthiel
> Date: Thu, 14 Jul 2011 17:42:56 +0800
> Subject: Re: master slave different site different resolution
> From: short...@gmail.com
> To: d_gabri...@hotmail.it
> CC: bind-users@lists.isc.org
>
> 2011/7/14 Gabriele Gabriele <d_gabri...@hotmail.it>:
> > Dear lists,
> >
> > I have an issue to resolve about 2 dns server Master/Slave.
> >
> >
> > The Master is positioned in a site with public ip 1.1.1.1 and all
the public
> > dns resolutions point to 1.1.1.1
> > the Slave is positioned in a site whit public ip 2.2.2.2 and
obviously all
> > the public dns resolutions point to 1.1.1.1
> >
> >
> > the problem born when my Master site go down, because the Slave should
> > change the dns public resolution whit 2.2.2.2
> > is it possible use bind for this?
> >
>
>
> Sorry my bad understanding for your statement.
> But since you have two servers, two public IPs, why not just publish
> these two as authority or cache only servers?
>
> Regards.
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