Serving several clusters with several virtual hosts.

[henrik242]

Hi.

I'm trying to serve several clusters with several virtualhost entries in one Apache instance. Here's a simplified version of the Apache config:

Listen 7777
<VirtualHost *.7777>
 ManagerBalancerName cluster-1
 ServerAdvertise Off # Can only exist in one virtualhost entry
</VirtualHost>

Listen 7778
<VirtualHost *.7778>
 ManagerBalancerName cluster-2
</VirtualHost>

I set advertise to false in mod-cluster.sar/META-INF/mod-cluster-jboss-beans.xml. In the first cluster I set proxyList to webserver:7777, and on the other webserver:7778.

The problem is that both clusters still show up in /mod_cluster_manager on both webserver:7777 and webserver:7778.

This is fairly simple to do with a plain mod_proxy_cluster, I just define two virtualhost entries like this:

Listen 7777
<VirtualHost *:7777>
 <Proxy balancer://cluster-1>
 BalancerMember ajp://jboss1:8009 route=node1
 BalancerMember ajp://jboss2:8009 route=node2
 </Proxy>
 ProxyPass balancer://cluster-1/ stickySession=JSESSIONID|jsessionid
</VirtualHost>
Listen 7778
<VirtualHost *:7778>
 <Proxy balancer://cluster-2>
 BalancerMember ajp://jboss3:8009 route=node3
 BalancerMember ajp://jboss4:8009 route=node4
 </Proxy>
 ProxyPass balancer://cluster-2/ stickySession=JSESSIONID|jsessionid
</VirtualHost>

How do I do this with mod_cluster?

[henrik242]

Sorry, I made a couple of typos and there's no edit button:

* In the first code block there should be a ":", not a "." in the VirtualHost entries
* I ment "mod_proxy_balancer" when I wrote "mod_proxy_cluster"

[jfclere]

Listen 7777
<VirtualHost *:7777>
 ProxyPass balancer://cluster-1/ stickySession=JSESSIONID|jsessionid
</VirtualHost>
Listen 7778
<VirtualHost *:7778>
 ProxyPass balancer://cluster-2/ stickySession=JSESSIONID|jsessionid
</VirtualHost>
# VritualHost host to receive information from the clusters.
Listen 6666
<VirtualHost *:6666>
 ServerAdvertise on
CreateBalancers 0
</VirtualHost>

Something like what is above should do the trick. But you have to configure balancer in bean description.

Note that the /mod_cluster_manager display all the nodes it has received information from.

[henrik242]

Something like what is above should do the trick. But you have to configure balancer in bean description.

Thanks for the swift reply! I've added ..

<property name="balancer">cluster-1</property>

.. to the HAModClusterConfig bean in mod-cluster-jboss-beans.xml and

ProxyPass / balancer://cluster-1/ stickySession=JSESSIONID|jsessionid

.. to the Apache VirtualHost. Now all requests just returns immediately, without any content. What did I miss?

Note that the /mod_cluster_manager display all the nodes it has received information from.

Ok, so it's not specific to the current VirtualHost? Good to know.

[jfclere]

"Now all requests just returns immediately, without any content"
Weird.... Any thing in the httpd the error_log?

[henrik242]

Thanks for the feedback. I didn't have more time to test this setup, it had to go live.

I'll try to recreate it when I have some more time.