!Apache

• when building apache use the worker module, because of its scalability.

./configure --with-mpm=worker --prefix=/usr/local/apache --enable-module=so

here is a highly scalable example of the configuration for a worker module (this goes in the httpd.conf file)

<IfModule?? worker.c> StartServers?? 20 ServerLimit?? 250 MaxClients?? 10000 MinSpareThreads?? 1000 MaxSpareThreads?? 15000 ThreadsPerChild?? 50 ThreadLimit?? 15000 MaxRequestsPerChild?? 0 </IfModule>

this will give us the ability to server up to 15000 concurrent clients from 1 machine.

• other httpd.conf changes

Timeout 3000 MaxKeepAliveRequests?? 0 KeepAliveTimeout?? 3000

note: making these changes to Apache conf seems to make the difference between working and not, but we need to look at this further because something like a KeepAliveTimeout?? of 3000 (secs) = 50 minutes is huge. A lot of waiting connections!

tomcat setting, place at the bottom of the file

LoadModule?? jk_module modules/mod_jk-2.0.43.so JkWorkersFile?? /usr/local/apache/conf/workers.properties JkLogFile?? /usr/local/apache/logs/mod_jk.log JkLogLevel?? info JkLogStampFormat?? "[%a %b %d NaVM:%S %Y] "

Include /usr/local/tomcat/conf/auto/mod_jk.conf

• workers.properties file, goes in {apache root}/conf directory

workers.tomcat_home=/usr/local/tomcat

workers.java_home=/usr/local/java ps=/ worker.list=ajp13 worker.ajp13.port=8009 worker.ajp13.host=192.168.0.x worker.ajp13.type=ajp13