How to minimize the downtime in my case

[Dave Warren]

On 3/14/2013 12:04, Manish Rane wrote:
> Hey Folks,
>
> I right now have NS server hosted with ISP and I am planning to set up 
> my own BIND servers. Now I would like to understand that I need to ask 
> my Registrar to populate the entry of my new NS server which would 
> take 4-6 hours to propagate over the internet.
>
> To reduce the downtime, can I not add those two new NS servers along 
> with my old DNS server with exact zone? once all the NS 
> entries populate over the internet I can have my ISP's DNS removed and 
> have one of my DNS server as Master?
>
>
> Current Scenario
> ------------------------------------
>
> ns1.example.com <http://ns1.example.com>    1.2.3.4
> ns2.example.com <http://ns2.example.com>     5.6.7.8
>
>
> I am thnking of below scenario
>
> ns1.example.com <http://ns1.example.com>    1.2.3.4
> ns2.example.com <http://ns2.example.com>     5.6.7.8
> mynewns1.example.com <http://mynewns1.example.com>   20.20.20.20
> mynewns2.example.com <http://mynewns2.example.com>   30.30.30.30
>
> Then after few days
>
> mynewns1.example.com <http://mynewns1.example.com>   20.20.20.20
> mynewns2.example.com <http://mynewns2.example.com>   30.30.30.30
>
> Which eventually should have all the records.
>


Maybe I'm over-complicating or under-complicating something here, but 
why bother? If you just switched directly from the old servers to the 
new servers, with the zones being identical outside of any NS related 
changes, wouldn't things "just work" throughout the transition?

Sure, depending on TTLs involved, some clients might hit the old NS and 
some would hit the new NS until the records aged out of caches, but as 
long as the other records are identical, users will hit the same web 
servers, the same MX, etc.

-- 
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren

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