Tone, In advance I'll say that this isn't the best way to do this, Sean Upton has better advice, but this is a simple way to test that all works as planned. The rewrite rules in Apache can make use of a file to do 'random' server selections. I do this when I'm testing new ZEO services, getting them serving in a 'round-robin' fashion. I have a httpd.conf in work that will do exactly what you want, but I can give you a few pointers right away. Mail me on Monday, and I'll send you the relevant parts of my httpd.conf. Anyway on with the show: Take a look at this document, http://httpd.apache.org/docs-2.0/mod/mod_rewrite.html. Search for 'Randomised Plain Text' and there's your recipe. Basically, you need to create a file that has these lines in, call it map.txt (the name doesn't really matter though): localhost port1|port2|port3 replace port1 .. port 3 with the exact ports you are using: localhost 8080|8081|8082 You can put as many options on this line as you need. Then change your final rewrite rule to be like this: RewriteMap servers rnd:/path/to/file/map.txt RewriteRule ^/(.*) http://localhost:$(servers:localhost)/VirtualHostBase/http/myserver.ncl.ac.u k:80/VirtualHostRoot/$1 [P] This will put a random port number into the line thereby giving you pseudo 'round-robin' functionality. The ${servers:localhost} is the clever part, 'servers' is the name of the map, and localhost is a parameter telling the map which line of the map.txt file to choose from. And that's it, job done, next please.... hth Phil phil.harris@zope.co.uk ----- Original Message ----- From: "Tony McDonald" <tony.mcdonald@ncl.ac.uk> To: "Zope" <zope@zope.org> Sent: Saturday, August 25, 2001 5:13 PM Subject: [Zope] Advice needed: load balancing wih ZEO and Apache on Solaris.

Hi, I've followed the instructions at <http://www.zope.org/Members/dshaw/AdvancedSiteSetup> to set up a ZEO server and client (on the same machine). These instructions are very clear and I'd recommend them to people wanting to experiment with ZEO.

We serve our content up through Apache (fast delivery of static content, CGI scripts and PHP4 served too).

I'm using the VHM method of routing Apache requests through to my ZServer installation so (only a snippet shown, and this is an example);

RewriteEngine on RewriteRule ^/cgi-bin - [L] RewriteRule ^/static - [L] RewriteRule ^/ltsn_images - [L] RewriteRule ^/(.*)

http://localhost:18080/VirtualHostBase/http/myserver.ncl.ac.uk:80/VirtualHos

tRoot/$1 [P]

Following the instructions from Dave Shaws' page I have a ZEO server running on port 8080 and a client running on port 8081

One idea I've had from reading the Apache Rewrite rules page at <http://httpd.apache.org/docs/misc/rewriteguide.html> Is to use ProxyPassReverse (in some way), i.e.

ProxyPassReverse / http://localhost:8080/ ProxyPassReverse / http://localhost:8081/

My question is this;

What can I do to get requests from myserver.ncl.ac.uk farmed out to my ZEO server-client farm?

Any pointers would be really appreciated. Cheers Tone. -- Dr Tony McDonald, Assistant Director, FMCC, http://www.fmcc.org.uk/ The Medical School, Newcastle University Tel: +44 191 243 6140 A Zope list for UK HE/FE http://www.fmcc.org.uk/mailman/listinfo/zope

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