Readers familiar with Oracle Solaris Zones and networking administration stand to gain the most from the recent OTN article How to Set Up a Load-balanced Application Across Two Oracle Solaris Zones, but because the paper begins with an overview of the Integrated Load Balancer (ILB) built in to Oracle Solaris 11, the subject is well explained. The author follows this overview with an example of setting up a virtual Apache Tomcat server instance in the half-NAT mode, in which the ILB, as traffic hits it, re-writes the destination IP address of the real server, preserving the source IP address. The half-NAT mode, the paper explains, is the preferred mode for server logging. In the 11-step example incoming traffic is load-balanced to the virtual server across two zones, each of which runs the Apache Tomcat Server while the load balancer itself is configured as a multihomed zone. ILB's Layer 3 and Layer 4 load-balancing capability enables the interception of incoming requests which are then routed to the appropriate back-end server following a set of load-balancing rules before it forwards requests to the selected server.

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Integrated Load Balancing Feature in Solaris 11

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