[ILUG] Load balancing a web server / dns

[Vincent Cunniffe]

ilug-admin at linux.ie wrote:
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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..

<snip>

> 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.

It's a round-robin system : it sequentially supplies entries from a
pool of resources that it knows about, so that on average a large 
number of requests will get spread equally over a number of servers.

You can do it with a software DNS agent running on your server, or you
can get a hardware solution. I think Cisco have a box that'll do it
for you.

Vin