WWW failover me DNS

[Polychronis Ypodimatopoulos]

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.


On Tuesday 12 July 2005 10:50, Spiros Bolis wrote:
> On Tue, 12 Jul 2005, Spiros Bolis wrote:
> > (me ena grhgoro psa3imo sto google)
>
> gia na apanthsw ston eayto moy
>
> Why DNS Based Global Server Load Balancing (GSLB) Doesn’t Work
>
> http://www.tenereillo.com/GSLBPageOfShame.htm
>
> epanadiatypwnw epomenws thn erwthsh:
> to exei kanei kaneis allos kai exei diaforetikh apopsh apo ton parapanw?

-- 
Polychronis Ypodimatopoulos
ENTELIA Informatics
10, Koritsas str
15343 Ag. Paraskevi
Athens, Greece

Tel/Fax: +30 2106391009
Cell:    +30 6937400317
pol at entelia.gr
http://www.entelia.gr