Load balancing

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Load balancing spreads the load among multiple backend Resin servers in a . A frontend Resin server proxies requests to the backend servers and sends the results to the clients.

We'll use 192.168.0.10 as the frontend machine and 192.168.0.20 through 192.168.0.28 as the backend machines.

The frontend server and the backend cluster have different configurations since they perform different roles.

Contents

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The Frontend Server

1. dispatches requests to the backend servers, generally using sticky sessions
2. acts as a for the backend cluster
3. pools the proxy sockets for efficiency

== The Backend

1. does the actual work: the database querying and form processing
2. manages persistent sessions

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Frontend Configuration

The frontend needs to configure:

1. The external HTTP and HTTPS ports its listening to
2. The cluster-definition of the backend cluster
3. A LoadBalanceServlet to dispatch requests to the backend

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frontend.conf

  
    

    
      15s

      
      
    

    

    
      
        
          
            backend
          
        

        
      
    
  

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Sharing Cluster configuration: cluster.xml and <>

Many sites will create a separate cluster.xml using resin's resin:import directive to share information between the frontend and backend:

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cluster.xml

  30s

  
  

In the frontend.conf, you'll replace the <> content with a <>

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frontend.xml

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