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Configuration file mod_rewrite load balancing
Tomcat - Extra Features example from a Well House Consultants training course
More on Tomcat - Extra Features [link]
Source code: mod_rewrite-load_balance Module: A900
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balance.conf :::::::::::::: SHARE162 192.168.200.162:8080 SHARE152 192.168.200.152:8080 FIRST 192.168.200.162:8080|192.168.200.152:8080 :::::::::::::: phpbal.conf :::::::::::::: local 192.168.200.67:80 live www.wellho.net:80 FIRST 192.168.200.67:80|www.wellho.net:80 1. httpd.conf - selecting a random (Tomcat) server for each request RewriteMap SERVERS rnd:/usr/local/apache2/conf/balance.conf <Location /tommy> RewriteEngine On RewriteRule /tommy/(.*) http://${SERVERS:FIRST}/latmjdemo/$1 [P] </Location> ProxyPassReverse /tommy http://192.168.200.152:8080/latmjdemo ProxyPassReverse /tommy http://192.168.200.162:8080/latmjdemo # Note - engine names in Tomcat server.xml file are SHARE152 and SHARE162 2. httpd.conf - selecting a random server at first hit, then using the same server if URL includes a jsessionid. RewriteMap SERVERS rnd:/usr/local/apache2/conf/balance.conf <Location /tommy> RewriteEngine On RewriteRule /tommy/(.*);jsessionid=(SHARE\d+) http://${SERVERS:$2}/latmjdemo/$1;jsessionid=$2 [P,L] RewriteRule /tommy/(.*) http://${SERVERS:FIRST}/latmjdemo/$1 [P] </Location> ProxyPassReverse /tommy http://192.168.200.152:8080/latmjdemo ProxyPassReverse /tommy http://192.168.200.162:8080/latmjdemo 3. httpd.conf - selecting a random server at first but then returning to the same server based on a cookie set on the first page. RewriteMap SERVERS rnd:/usr/local/apache2/conf/phpbal.conf <Location /booze> RewriteEngine On # Next line historic - for URL rewrite stuff under Java # RewriteRule /booze/(.*);jsessionid=(SHARE\d+) http://${SERVERS:$2}/latmjdemo/$1;jsessionid=$2 [P,L] RewriteCond %{HTTP_COOKIE} "what=(\w+)-(\w+)" RewriteRule /booze/(.*) http://${SERVERS:%1}/demo/$1 [P,L] RewriteRule /booze/(.*) http://${SERVERS:FIRST}/demo/$1 [P] </Location> ProxyPassReverse /booze http://192.168.200.67:80/demo ProxyPassReverse /booze http://www.wellho.net:80/demo This example (no. 3) was tested with a PHP page on the server as we had a lot of PHP Cookie apps and servers lying to hand ;-) ==================================== pubsales.php4 - The testing PHP script ==================================== <?php $free = array("beer","wine","lager","brandy","vodka"); $first = 0; if (! is_string($_COOKIE[what])) { $drink = $free[rand(0,count($free)-1)]; ### Change local to live on second machine so it shows ### up differently in tests. Also make some other ### changes to the page for testing so you can tell ### the servers apart easily. setcookie("what","local-".$drink); $first = 1; ?> <html> <body bgcolor=green><h1>Have a <?= $drink ?> on us</h1></body> </html> <?php } else { $drink = $_COOKIE[what]; ?> <html> <body bgcolor=fucshia text=white><h1>Did you like your free <?= $drink ?>?</h1> The Bar is open if you want to purchase another</body> </html> <?php } ?> Learn about this subject
This module and example are covered on the following public courses:
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