How to create a hot standby node when using mod_proxy

Solution Verified - Updated -

Environment

  • JBoss Enterprise Application Server (EAP)
  • JBoss Enterprise Web Server (EWS)
  • Red Hat Enterprise Linux (RHEL)
  • Apache httpd

Issue

  • We are planning to use the EWS as a loadbalancer in front  of some JBoss servers and Tomcat servers. If we need to have a server on hot standby mode, how do we go about this ? We currently have the following config:

      <Proxy balancer://mycluster>
       Order deny,allow
       Allow from all

       BalancerMember https://host1:443/app1 route=node1
       BalancerMember https://host2:443/app1 route=node2
     </Proxy>

     ProxyPass /app1 balancer://mycluster/app1
     ProxyPassReverse /app1  https://host1:443/app1
     ProxyPassReverse /app1  https://host2:443/app1

Resolution

If host2 is going to be on hot standby, then the new config should look like this:

<Proxy balancer://mycluster>
       Order deny,allow
       Allow from all

       BalancerMember https://host1:443/app1 route=node1 
       BalancerMember https://host2:443/app1 route=node2 status=+H
     </Proxy>

     ProxyPass /app1 balancer://mycluster/app1
     ProxyPassReverse /app1  https://host1:443/app1
     ProxyPassReverse /app1  https://host2:443/app1

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