Re: Moving server. DNS re-propogation question

[Herbie <technowombat@yahoo.com>]

Well here's some semi-noob language, mainly because I only have a vague 
understanding of it myself, or at least the DNS part ;)

First of when you update the DNS files, you change the serial, increment 
it by one is the normal way, the TTL is Time To Live, how long that 
information should be regarded as reliable.

httpd.conf rarely has IP's in it, usually it has domain names that all are 
resolved to the same IP.

You also need to change the IP address on the network interface (I assume, 
as you say you are moving IP), ifconfig can be used to make this change 
temporarily, but you should use what ever config files or tools are 
relevant to your distro. In debian it's /etc/network/interfaces, in Redhat 
it used to be under /etc/sysconfig if memory serves, there's probably a 
config tool for it. Tell us your distro, we tell you where to find your 
magic tool ;)

After the changes, most should propagate in a few hours, not days, 
normally.

If this is a commercial server, and you have customers, I strongly suggest 
you get someone familiar with all these intricacies in to oversee or just 
make the changes for you. Lots of linux geeks out there can be had for 
little money for one-off's. If it's your home project, good luck to you ;)

herbie

On Fri, 6 May 2005, John Wolgamot wrote:

> My knowledge in this area is limited so please speak to me in semi-noob
> language.
>
> I'm moving a server and everything is remaining the same. The static IP
> number will be the only change.
>
> I'm presuming I can first edit the http.conf and replace the occurrences of
> the old IP with the new IP.
>
> It is my understanding that I also need to change the TTL in the DNS zone
> files to a different number and resave them. I read somewhere that saving
> one small change in the zone files will cause the propagation to be set into
> motion faster. As I said, this is my understanding but I could be very wrong
> on this. I seem to remember reading this in the past though.
>
>
> After the above changes, the server should come back up in a couple of
> days??? :-).
>
> Will this work, or is there something else I'm missing?
>
> I realize I will also have to change the settings in the internet connection
> dialog as well but I'm more worried about feeling sure that everything
> concerning DNS and IP is correct so the propagation takes place instead of
> 72 hours later finding out I did something wrong and have to make a change
> only to wait another 72 hours.
>
> In the VAR/named directory there are four files per virtual server:
> in.rev
> in.zone
> out.rev
> out.zone
>
> My out zone file (Partial)
> --------------------------
> $TTL 1h
> @ IN SOA main.example.com. root.example.com. (
>  10
>  1h
>  2h
>  1w
>  1h )
>  IN NS main.example.com.
>
>
> Example pulled from the internet(Partial)
> -----------------------------------------
> $TTL 86400
> @     IN     SOA    dns1.example.com.     hostmaster.example.com. (
>                    2001062501 ; serial
>                    21600      ; refresh after 6 hours
>                    3600       ; retry after 1 hour
>                    604800     ; expire after 1 week
>                    86400 )    ; minimum TTL of 1 day
>
>      IN     NS     dns1.example.com.
>
>
> Thanks ahead,
> John Wolgamot
>
>
>
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