K Sambaiah wrote:

>>>when b goes down due to some prob then i want dns to
>>>point www.upen.com to 'a'
>>>how do i achieve this????
>>>
>>>      
>>>
>>Your /etc/hosts should look something like:
>>
>><a-ip>     a.upen.com        a
>><b-ip>     b.upen.com        b
>>
>>Also /etc/resolv.conf should have entries:
>>
>>nameserver    <b-ip>
>>nameserver    <a-ip>
>>
>>    
>>
>
>  This will not solve the problem. If both a-ip and b-ip are up then
>   resolver pickup randomly. If a-ip is up then still resolver may
>   pickup a-ip and say the site is not reachable.
>
>sam
>  
>

This concept will be applicable only if you want geographical load 
balancing.
Try a product like F5 3DNS(www.f5.com), or Resonate Global 
Dispatch(www.resonate.com)
At the time of writing this I do not know any open source product

**But If you have your two or more machine locally on a single network 
then it will adivisable to use lvs ***
It is only for local loadbalancing, It is the best of best available for 
open source people(www.linuxvirtualserver.org)

-Jujubs




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