WWW failover me DNS

[Giannis Andriopoulos]

----- Original Message ----- 
From: "Giorgos Keramidas" <keramida at ceid.upatras.gr>
To: "Polychronis Ypodimatopoulos" <pol at entelia.gr>
Cc: <linux-greek-users at lists.hellug.gr>; "Spiros Bolis" <sbolis at freemail.gr>
Sent: Tuesday, July 12, 2005 12:36 PM
Subject: Re: WWW failover me DNS


> On 2005-07-12 11:38, Polychronis Ypodimatopoulos <pol at entelia.gr> wrote:
> > Sto proigoumeno mail aneferes oti peftei ena mixanima (theos
> > sxoresto!) To link gia to GSLB einai polu endiaferon alla anaferetai
> > se whole site failovers. Auto einai polu polu diaforetiko kai
> > suntheto.  An omos to problima sou einai na upostirikseis ena server
> > me ena backup server kai oi duo autoi briskontai piso apo ena NAT pou
> > eksipiretei to domain 1-2-3-4.gr tote i katastasi aplopoieitai polu!
> >
> > Basika, stin periptosi auti to dns caching problima pou anaferei to
> > GSLB den ufistatai pleon opou kai an vrisketai o dns (piso i mprosta
> > apo to NAT) kai tha mporousa na sou eksigiso giati.  Se mia toso apli
> > periptosi omos de xreiazesai kan to GSLB mias kai o backup server tha
> > mporouse aplos na kanei polling pano ston primary kai na parei ti
> > thesi tou molis ton brei na upoferei apo sundromo "down". Enas
> > ping-based polling mechanism einai arketos se sunduasmo me mia
> > ifconfig gia na "foreseis" tin IP tou "ekleipontos" primary server.
> > Kodika gia to polling mporo na sou steilo, an kai eimai sigouros oti
> > tha ton breis/grapseis polu eukola.
>
> Pos "epanerxetai" o kanonikos server otan shkw8ei pali?
>
Edw uparxei kai h periptwsh na mh 8elei/xreiazetai na parei pisw ta
resources to mhxanhma pou molis anevhke. An ontws de xreiazetai kati tetoio,
h lush pou edwse o Poluxronhs einai mia xara.

Giannis