WWW failover me DNS

[Apollon Koutlides]

Giannis Andriopoulos wrote:

>>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
>  
>
Το Linux-HA project ( http://linux-ha.org ) έχει κάποια εργαλειάκια 
(τόσο για Linux όσο και για άλλα OSes όπως λένε και στο homepage τους 
που βοηθάνε πολύ σε διαδικασίες failover και σία. Συγκεκριμένα, το 
heartbeat ( http://linux-ha.org/HeartbeatProgram ) και το βάναυσο 
stonith ( http://linux-ha.org/STONITH ) είναι συνήθως αρκετά για την 
πλειοψηφία των πιιθανών υλοποιήσεων.

Α.
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