[ILUG] Load balancing a web server / dns

[Brady, Padraig]

Yep, Rotating DNS quite easy...
(others will explain I'd say, so I won't).

Note you can also get a special device (Cisco redirector for e.g.)
to do it. This is a lot more configurable and robust.

> -----Original Message-----
> From: Anton Mc Kee [mailto:amk at broadcom.ie]
> Sent: 07 January 2000 12:40
> To: ilug at linux.ie
> Subject: [ILUG] Load balancing a web server / dns
> 
> 
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> 
> Hi all.
> 
> Does anyone know how to "Load balance" a web server.
> 
> I am trying to figure this out and using the Microsoft web site as an
> example..
> 
> No because they are a massive corp that gets probally the most hits
> (Don't quote me as I don't know or care who does) along with netsacpe
> and hotmail and the ssearch engines, they need to balance the amount
> of connections their web servers get. So how do they do this.
> 
> I originally though it was some mad cool app they had but now I'm not
> too sure about the Mad cool bit. 
> 
> Here is the output from 5 nslookups done at about 1 second intervals.
> Name:    microsoft.com
> Addresses:  207.46.131.30, 207.46.131.28, 207.46.131.137,
> 207.46.130.45
>           207.46.130.150, 207.46.130.149, 207.46.130.14
> Aliases:  www.microsoft.com      
> 
> Name:    microsoft.com
> Addresses:  207.46.131.137, 207.46.130.45, 207.46.130.150,
> 207.46.130.149
>           207.46.130.14, 207.46.131.30, 207.46.131.28
> Aliases:  www.microsoft.com 
> 
>  207.46.130.149, 207.46.130.14, 207.46.131.30, 207.46.131.28
>           207.46.131.137, 207.46.130.45, 207.46.130.150
> Aliases:  www.microsoft.com   
> 
> Name:    microsoft.com
> Addresses:  207.46.130.14, 207.46.131.30, 207.46.131.28,
> 207.46.131.137
>           207.46.130.45, 207.46.130.150, 207.46.130.149
> Aliases:  www.microsoft.com 
> 
> Name:    microsoft.com
> Addresses:  207.46.131.28, 207.46.131.137, 207.46.130.45,
> 207.46.130.150
>           207.46.130.149, 207.46.130.14, 207.46.131.30
> Aliases:  www.microsoft.com    
> 
> See the way the dns changes all the time. this would tell a client to
> go to what ever machine was looked up. So how do I do this in Linux
> or *nux. Anybody got any ideas? Or is it a mad cool app?
> 
> Does that also mean that I have to restart my web server in time with
> the change in DNS so that it resolves to the ip?
> 
> 
> And while I on, does anyone know of a course in mysql (SQl in general
> so long as it's not M$ sql server ) and php either separate or
> together. (I can get the manuals and stuff but still it's also handy
> to have a teacher when you don't know what exactly what is happening
> and it also less time consuming). Anywhere here or in the UK will do.
> 
> Thanks
> AJ
> 
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> *****************************************
> AJ Mc Kee
> "We all go down now and again"
> http://dezel.dhs.org
> ****************************************
> 
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