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List:       jboss-user
Subject:    [JBoss-user] Strange load balancing behavior with mod_jk2
From:       Björn_Weis <bjoern_weis () web ! de>
Date:       2003-12-30 11:12:59
Message-ID: 3FF15DBB.30604 () web ! de
[Download RAW message or body]

Hallo,

I run Apache2 with mod_jk2 and 3 JBoss 3.2.3 with the included Tomcat on 
Suse 8.2.

When requesting to the jsp-pages in the JBoss 3.2.3 the load balancing 
behavior is
not round robin. It seems to me that every time the benchmark send 
requests to the
Apache2 the mod_jk2 makes a new slot and in this slot the requests are 
distributed
round robin (when sometimes a slot is used twice). This is only with 
sticky-session
pages. With other pages load balancing works fine. When I try that 
manual I can
verify it (I use diffrent browsers on diffrent machines, so that I get 
allways new cockies),
so it does not lie on the benchmark application.

My config files:
jboss-service.xml from the tomcat:
...
<Engine jvmRoute="${jboss.bind.address}:8009" name="MainEngine" 
defaultHost="localhost">
...
<!-- A AJP 1.3 Connector on port 8009 -->
<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
           address="${jboss.bind.address}" port="8009" minProcessors="5" 
maxProcessors="75"
           enableLookups="true" redirectPort="8443"
           acceptCount="10" debug="0" connectionTimeout="100000"
           useURIValidationHack="false"
           protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>
...
<attribute name="CatalinaHome">${jboss.server.home.dir}/tomcat</attribute>
<attribute name="CatalinaBase">${jboss.server.home.dir}/tomcat</attribute>

jk2.properties in the conf path I set in the jboss-service.xml 
(${jboss.server.home.dir}/tomcat/conf):

# The jk2.properties file should be in the directory 
?$TOMCAT_HOME/conf?. This file contains all of the JK2 configuration 
information. Here we will set up the shared memory directive. This 
directive is necessary for Apache and Tomcat to communicate. A good 
place to have the file is the ?$APACHE_HOME/logs? directory. The file 
can be named anything but the convention is ?jk2.shm?.
# TODO: What to do in case Tomcat and Apache reside on different machines.
#Shared memory directive
shm.file=pathToApache/logs/jk2.shm

workers2.properties in the apache conf directory:

[logger]
level=DEBUG

[config:]
file=${serverRoot}/conf/workers2.properties
debug=0
debugEnv=0

[uriMap:]
info=Maps the requests. Options: debug
debug=0

# Alternate file logger
#[logger.file:0]
#level=DEBUG
#file=${serverRoot}/logs/jk2.log

[shm:]
info=Scoreboard. Required for reconfiguration and status with 
multiprocess servers
file=${serverRoot}/logs/jk2.shm
size=1024
debug=0
disabled=0

[workerEnv:]
info=Global server options
timing=1
debug=0
# Default Native Logger (apache2 or win32 )
# can be overriden to a file logger, useful
# when tracing win32 related issues
#logger=logger.file:0

[channel.socket:host1:8009]
info=Ajp13 host1
debug=0
lb_factor=1
group=lb
tomcatId=host1:8009
disabled=0

[channel.socket:host2:8009]
info=Ajp13 host2
debug=0
lb_factor=1
group=lb
tomcatId=host2:8009
disabled=0

[channel.socket:host3:8009]
info=Ajp13 host3
debug=0
lb_factor=1
group=lb
tomcatId=host3:8009
disabled=0

[status:]
info=Status worker, displays runtime informations

[uri:/jkstatus/*]
info=Display status information and checks the config file for changes.
group=status:

[uri:/MyApp/*]
info=load balancer uri
group=lb
debug=0

httpd.conf in the apache conf directory:
...
#
# Load mod_jk
#
LoadModule jk2_module modules/mod_jk2.so

Thats my configuration. The connector seems to work but the load 
balancer will not use round robin over the servers.

Any ideas?

Thanx
    Björn Weis





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