5 Replies Latest reply on Feb 16, 2015 11:43 AM by Jean-Frederic Clere

    Multiple Virtual Hosts (1 x Apache httpd + 2 x Apache Tomcat)

    joaocunhalopes Newbie

      Hi all.

      Questions are on the end of this post.

      Scenario definitions:

       

      windows 32 bit

      mod_cluster 1.2.6 Final

      1 x Apache httpd 2.2 (configuration with 1 main server + 1 virtual host for mod_cluster + 2 virtual hosts for dynamic content + 1 virtual host for direct IP requests)

      2 x Apache Tomcat 6

       

      On the httpd side:

       

      # Modules for JBoss mod_cluster

      LoadModule proxy_ajp_module modules/mod_proxy_ajp.so

      LoadModule slotmem_module modules/mod_cluster/mod_slotmem.so

      LoadModule manager_module modules/mod_cluster/mod_manager.so

      LoadModule proxy_cluster_module modules/mod_cluster/mod_proxy_cluster.so

      LoadModule advertise_module modules/mod_cluster/mod_advertise.so

       

      # mod_manager (mod_cluster) configuration.

      <IfModule manager_module>

          Maxnode 60

          Maxhost 40

          Maxcontext 200

      </IfModule>

       

      # mod_proxy_cluster (mod_cluster) configuration.

      <IfModule proxy_cluster_module>

          CreateBalancers 1

      </IfModule>

       

      # Bind Apache to IP address 192.168.125.108 and port 6666.

      Listen 192.168.125.108:6666

       

      # Virtual host for JBoss mod_cluster (port 6666 will be used to receive information from Tomcat servers)

      <VirtualHost 192.168.125.108:6666>

          KeepAliveTimeout 60

          MaxKeepAliveRequests 0

         

          ServerAdvertise Off

          EnableMCPMReceive

         

          <Location />

              Order deny,allow

              Deny from all

              Allow from 192.168.125.

          </Location>

      </VirtualHost>

       

      # www.server1.com

      <VirtualHost *:80>

          # Named server information

          ServerAdmin "someone at somewhere dot com"

          ServerName www.server1.com

       

          # Log files

          ErrorLog "|bin/rotatelogs -l logs/www.server1.com-error_%Y%m%d.log 86400"

          CustomLog "|bin/rotatelogs -l logs/www.server1.com-access_%Y%m%d.log 86400" combined

       

          # Enables runtime rewriting engine

          RewriteEngine on

       

          # Exceptions to mod_cluster balancer.

          ProxyPass / balancer://aaaa/ stickysession=JSESSIONID|jsessionid nofailover=On

          ProxyPassReverse / balancer://aaaa/

          ProxyPreserveHost on

      </VirtualHost>

       

      # www.server2.com

      <VirtualHost *:80>

          # Named server information

          ServerAdmin "someone at somewhere dot com"

          ServerName www.server2.com

       

          # Log files

          ErrorLog "|bin/rotatelogs -l logs/www.server2.com-error_%Y%m%d.log 86400"

          CustomLog "|bin/rotatelogs -l logs/www.server2.com-access_%Y%m%d.log 86400" combined

       

          # Enables runtime rewriting engine

          RewriteEngine on

       

          # Exceptions to mod_cluster balancer.

          ProxyPass / balancer://bbbb/ stickysession=JSESSIONID|jsessionid nofailover=On

          ProxyPassReverse / balancer://bbbb/

          ProxyPreserveHost on

      </VirtualHost>

       

      # 192.168.125.108 (Named server for internal service. No HTTPS)

      <VirtualHost *:80>

          # Named server information

          ServerAdmin "someone at somewhere dot com"

          ServerName 192.168.125.108

       

          # Log files

          ErrorLog "|bin/rotatelogs -l logs/192.168.125.108-error_%Y%m%d.log 86400"

          CustomLog "|bin/rotatelogs -l logs/192.168.125.108-access_%Y%m%d.log 86400" combined

       

          # mod_cluster Manager

          <Location /mcm>

              SetHandler mod_cluster-manager

       

              Order deny,allow

              Deny from all

              Allow from 192.168.125.

          </Location>

      </VirtualHost>

       

       

      On the tomcat(#1) side:


      <Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener" advertise="false" proxyList="192.168.125.108:6666" excludedContexts="ROOT,manager" balancer="aaaa" stickySession="true" stickySessionForce="false" stickySessionRemove="true"/>


      On the tomcat(#2) side:

       

      <Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener" advertise="false" proxyList="192.168.125.108:6666" excludedContexts="ROOT,manager" balancer="bbbb" stickySession="true" stickySessionForce="false" stickySessionRemove="true"/>




      And the questions:


      Question 1. The above works, and it's possible to get tomcat(#1) contexts loaded on virtual host www.server1.com since it's using balancer aaaa. Now, the interesting part is that CreateBalancers 1 does not seem to make a difference. In other words, commenting the lines


      # mod_proxy_cluster (mod_cluster) configuration.

      #<IfModule proxy_cluster_module>

      #    CreateBalancers 1

      #</IfModule>

       

      does not seem to make a difference.

      According to the manual for CreateBalancers

       

      0: Create in all VirtualHosts defined in httpd.

      1: Don't create balancers (requires at least one ProxyPass/ProxyPassMatch to define the balancer names).

      2: Create only the main server.

      Default: 2

       

      So, removing any explicit configuration should set the default value of 2, thus creating only the main server.

      It should be noticed that on the main server I am not using the line

       

      ManagerBalancerName cttcluster

       

      Actually I am not using ManagerBalancerName anywhare in this config.

       

      Nevertheless, it all works as if CreateBalancers 1 or CreateBalancers 2 (defualt) was exactly the same configuration. My expectations would be otherwise.

      Any thoughts on this?

       

       

      Question 2. Considering that tomcat#1 had context helloworld1 and that tomcat#2 has contexts helloworld1 *and* helloworld2, i.e.

       

      tomcat#1 reports to httpd on balancer aaaa context helloworld1

      tomcat#2 reports to httpd on balancer bbbb context helloworld1 *and* context helloworld2

       

      The following is loading *all* bbbb contexts (helloworld1 *and* helloworld2) on virtual host www.server2.com, while I would expect it to load only helloworld2

       

      # www.server2.com

      <VirtualHost *:80>

          # Named server information

          ServerAdmin "someone at somewhere dot com"

          ServerName www.server2.com

       

          # Log files

          ErrorLog "|bin/rotatelogs -l logs/www.server2.com-error_%Y%m%d.log 86400"

          CustomLog "|bin/rotatelogs -l logs/www.server2.com-access_%Y%m%d.log 86400" combined

       

          # Enables runtime rewriting engine

          RewriteEngine on

       

          # Exceptions to mod_cluster balancer.

          ProxyPass / balancer://bbbb/helloworld2/ stickysession=JSESSIONID|jsessionid nofailover=On

          ProxyPassReverse / balancer://bbbb/helloworld2/

          ProxyPreserveHost on

      </VirtualHost>

       

      I can explicity exclude dinamic content

       

          ProxyPassMatch ^/helloworld1/(.*)$ !

          ProxyPass / balancer://bbbb/ stickysession=JSESSIONID|jsessionid nofailover=On

          ProxyPassReverse / balancer://bbbb/

       

      But my expectation is that it would not be necessary in the first place (due to loading only balancer://bbbb/helloworld2

       

      Any comments?

       

      Thank you.