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|System Administration Guide: IP Services Oracle Solaris 11 Express 11/10|
Integrated Load Balancer (ILB) provides Layer 3 and Layer 4 load-balancing capabilities for the Oracle Solaris operating system (OS) installed on SPARC and x86 based systems. ILB intercepts incoming requests from clients, decides which back-end server should handle the request based on load-balancing rules, and then forwards the request to the selected server. ILB performs optional health checks and provides the data for the load-balancing algorithms to verify if the selected server can handle the incoming request.
This chapter discusses the following sections:
The key features of ILB include:
Support for stateless Direct Server Return (DSR) and Network Address Translation (NAT) modes of operation for IPv4 and IPv6
Allows ILB administration through a command-line interface (CLI)
Provides server monitoring capabilities through health checks
ILB has three major components:
ilbadm CLI – You can use this interface to configure load-balancing rules, perform optional health checks, and view statistics.
libilb configuration library – ilbadm and other third-party applications can use the functionality implemented in libilb for ILB administration.
ilbd daemon – This daemon performs the following tasks:
Manages persistent configuration
Provides serial access to the ILB kernel module by processing the configuration information and sending it to the ILB kernel module for execution
Performs health checks and notifies the results to the ILB kernel module so that the load distribution is properly adjusted