[Phpwm] Load Balancing and redundancy

[Mike Tipping]

Yes that's balance.

Good article on it here:

http://www.linux.com/article.pl?sid=05/07/27/1729229

that makes it sound amazingly easy. 

The things I'm not sure about are:

Redundancy - It can handle one of the web servers going down but what
happens if the balance server goes down?

Resources - I guess you need to have an exact copy of the site on each
server which sounds like a headache. Linux Virtual Server utilizes a shared
data store so gets around this.



-----Original Message-----
From: phpwm-bounces at mailman.lug.org.uk
[mailto:phpwm-bounces at mailman.lug.org.uk] On Behalf Of David Goodwin
Sent: 22 March 2007 13:08
To: West Midlands PHP User Group
Subject: Re: [Phpwm] Load Balancing and redundancy

Mike Tipping wrote:
> I've currently got a number of projects on the go that are going to exceed
> the capacity of a single server. These are fairly dynamic, session based
> sites hosted on LAMP servers.
> 
> Does anyone have any experience or advice on load balancing and adding
> redundancy to apache websites?
> 
> Currently I'm looked at:
> 
> * Balance - which seems too simple to be true 
>  
> * Virtual Linux Server - Heck of a lot more complicated but more powerful.

>  
> Any thoughts on these as solutions or suggestions on alternatives?
> 

If you store the sessions in a database, and write custom session 
handler functions, you could just use DNS round-robin....

e.g.
http://uk.php.net/manual/en/function.session-set-save-handler.php

I've not heard of Balance before - I presume you mean :
http://www.inlab.de/balance.html ?


I'd opt for LVS


David

-- 
David Goodwin

[ david at codepoets dot co dot uk ]
[ http://www.codepoets.co.uk       ]

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