Apache / Tomcat6 + mod_cluster configuration

[willemnoorduin]

For some clients we need to connect Apache2 to Tomcat and I want to try this with mod_cluster. After googling a lot it was clear that you need Tomcat > 6 (Tomcat5 is not accepting the Listener). When I start Tomcat, I get the following in the catalina.out:

INFO: Deploying web application directory docs

Jun 24, 2011 8:20:02 AM org.apache.catalina.startup.HostConfig deployDirectory

INFO: Deploying web application directory ROOT

Jun 24, 2011 8:20:02 AM org.apache.coyote.http11.Http11Protocol start

INFO: Starting Coyote HTTP/1.1 on http-8080

Jun 24, 2011 8:20:02 AM org.apache.jk.common.ChannelSocket init

INFO: JK: ajp13 listening on /0.0.0.0:8009

Jun 24, 2011 8:20:02 AM org.apache.jk.server.JkMain start

INFO: Jk running ID=0 time=0/16  config=null

Jun 24, 2011 8:20:02 AM org.apache.catalina.startup.Catalina start

INFO: Server startup in 1518 ms

Jun 24, 2011 8:20:12 AM org.jboss.modcluster.ModClusterService

INFO: Engine connector will use address: 145.78.121.33

Jun 24, 2011 8:20:12 AM org.jboss.modcluster.ModClusterService

INFO: Engine will use jvmRoute: 2b9ec669-7811-3129-b20a-5799767d5c78

So it is creating a jvmRoute for me, which is default mod_cluster > 1.1 behaviour when you don't set a jvmRoute in Tomcat's server.xml. As to the Apache configuration, I am drawing a blank. You cannot use the cluster commands, so something like:

will not work. There is no hint in the mod_cluster documentation either what to use instead. Can someone tell me what commands I must use to connect my Apache Virtual Host via mod_cluster to Tomcat 6.

[mbabacek]

Hi,

You cannot use the cluster commands, so something like:
blank line
will not work.

What do you mean by that statement? Do you have an empty Httpd configuration?

Can someone tell me what commands I must use to connect my Apache Virtual Host via mod_cluster to Tomcat 6.

Do you mean httpd config by "commands" in the aforementioned statement?

THX for clarification.

[willemnoorduin]

Seems like my Virtual host tags are not represented correctly. Sorry for that. Well, this is my Virtual Host:

< VirtualHost

* >
    ServerAdmin [e-mail]
    DocumentRoot /apps/www.test.nl/data
    ServerName www.test.nl
    ErrorLog logs/www.test.nl-error_log
    CustomLog logs/www.test.nl-access_log combined
    LogLevel debug

    ProxyPass / balancer://cluster1/application1 stickysession=JSESSIONID|jsessionid nofailover=On
    ProxyPassReverse / balancer://cluster1/application1
< /VirtualHos t>

You cannot use the

ProxyPass / balancer://cluster1/application1 stuff because you do not have a cluster like in JBoss-AS and you cannot set a cluster varaible for Tomcat (to represent cluster1, for example). Questions are:

• What can you use instead for passing jsp and so on to Tomcat (with mod_jk, the answer was JkMount) ?
• What do you use when you want to connect two or more Tomcats (with mod_jk the answer was workers.properties) ?

[mbabacek]

Well, I would use for a httpd machine called superbox01 e.g.:

Listen 8886
<VirtualHost superbox01:8886>
     ServerName superbox01
     ManagerBalancerName supercluster
     ServerAdvertise On
    AdvertiseGroup 224.0.1.105:23364
</VirtualHost>

And on Tomcat6 side in server.xml:

<Listener className="org.jboss.modcluster.ModClusterListener" stickySession="true" stickySessionRemove="true" stickySessionForce="false" />

This configuration applies for Mod_Cluster 1.0.x (see docs)

Mod_Cluster 1.1x introduces some additional features (see docs).

Note: The aforementioned configuration needs multicast enabled between the httpd and Tomcat6 box. In case you can't enable multicast, use proxyList.