RE: [users@httpd] Proxy Server to Web Server Ratio

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Yep.  Get your point.

Appreciate your thoughts and help.

Kind regards.

-----Original Message-----
From: Boyle Owen [mailto:Owen.Boyle@xxxxxxx] 
Sent: 05 July 2005 09:24
To: users@xxxxxxxxxxxxxxxx
Subject: RE: [users@httpd] Proxy Server to Web Server Ratio



> -----Original Message-----
> From: Veary, Marc, VF UK - Technology (TS)
> [mailto:Marc.Veary@xxxxxxxxxxxxxxxxx]
> Sent: Dienstag, 5. Juli 2005 10:11
> To: users@xxxxxxxxxxxxxxxx
> Subject: RE: [users@httpd] Proxy Server to Web Server Ratio
> 
> 
> My question was badly crafted, apologies...
> 
> Let me try again with an example:
> 
> If I have 50 web sites, each a cluster of 10 physical 
> machines with a web server on each.  Now, I want to place 
> Apache in front of these 50 sites (web server clusters) as a 
> reverse proxy.  What I am trying to figure out is roughly how 
> many physical machines I might need to host an Apache web 
> server for each cluster?

It's got nothing to do with the *number* of machines. Presumably, all these internal server are on a LAN - there's no limit to the number of machines you can have on the LAN (apart from the hard-limit from the width of the address space).

Note that I am NOT saying that your physical machine can handle an infinite amount of traffic - only that there is no limit defined by the protocol...

I think your question is really about bandwidth (which is quite a separate subject) and is impossible to answer without knowing the expected traffic on each site. You could have a million webservers and proxy them over a dial-up modem - if no-one ever requests a page from them...

Rgds,
Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored. 

> 
> Would 2 physical machines (clustered) handle the throughput 
> for a cluster of 10 web servers?  Is there a 'wet string' 
> guideline to the number of web servers (serving a single 
> site) that can be handled by a single Apache 2 proxy?
> 
> It is possible that I have just not understood...
> 
> Many thanks for any help.
> 
> Kind regards,
> --
> Viz
> 
> -----Original Message-----
> From: Boyle Owen [mailto:Owen.Boyle@xxxxxxx] 
> Sent: 05 July 2005 08:42
> To: users@xxxxxxxxxxxxxxxx
> Subject: RE: [users@httpd] Proxy Server to Web Server Ratio
> 
> > -----Original Message-----
> > From: Veary, Marc, VF UK - Technology (TS)
> > [mailto:Marc.Veary@xxxxxxxxxxxxxxxxx]
> > Sent: Dienstag, 5. Juli 2005 09:35
> > To: users@xxxxxxxxxxxxxxxx
> > Subject: [users@httpd] Proxy Server to Web Server Ratio
> > 
> > 
> > Hi All,
> > 
> > I am new to using Apache as a proxy.  Could someone give me a 
> > rough idea
> > of how many web servers Apache 2 can proxy?  
> 
> As many as there are on the internet.
> 
> Apache simply takes incoming requests from the client and 
> re-issues them to whatever proxy is defined in the config 
> rules for the given request...
> 
> Reading between the lines, I suspect you are harbouring a 
> misconception about how HTTP operates. It is not a 
> connection-based protocol - it is connectionless and 
> stateless. So your question is not like "how many phone calls 
> can a switchboard handle?", it is more like "how many 
> addresses can the post office deliver to?"
> 
> Rgds,
> Owen Boyle
> Disclaimer: Any disclaimer attached to this message may be ignored. 
> 
> > I know this is 
> > like asking
> > 'How long is a piece of string?', but I need a rough starting point.
> > Does anyone know of any stats from testing (mind craft, etc)?
> > 
> > Kind regards,
> > --
> > Viz
> > 
> > 
> > 
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> Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
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