Geographic Load Balancing With Envoy; Envoy Installation And Configuration; Installing Envoy; Configuring The Authoritative Name Server To Query Envoy - Coyote Point Systems Equalizer Installation And Administration Manual

High-performance load-balancing appliance

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Chapter 6:Administering Geographic Clusters

Geographic Load Balancing with Envoy

Coyote Point's Envoy geographic load balancer is an optional software add-on for the

Equalizer product line that supports geographic clustering and load balancing.

Geographic clustering and load balancing enable requests to be automatically distributed

across servers in different physical locations.

Each set of servers in a particular location is forms a site. A geographic cluster contains

multiple sites and Equalizer's geographic load balancing technology is used to balance

incoming requests across the sites. For more information about how geographic load

balancing works, see "Geographic Load Balancing" on page 6.

Using the administration interface to configure a geographic cluster and its sites is similar

to configuring a virtual cluster and its servers. See "Introducing the Equalizer

Administration Interface" on page 34 if you need information about how to access the

administration interface.

Note – To perform geographic load balancing, you need to install the Envoy add-on to your

Equalizer system.

Each site in an Envoy configuration has an Envoy-enabled Equalizer and any number of

servers. Once you've completed the normal Equalizer installation and configuration at

each location, you can install Envoy and configure your authoritative name server to work

with Envoy.

When you've completed the Envoy installation and DNS configuration described in this

section, you can set up the geographic clusters and define the available sites for each

cluster through the Equalizer Administration interface.

The Envoy software must be installed on each of the Equalizers that will be part of the

geographic cluster. To install Envoy:

Copy the Envoy executable file set from the floppy disk or Coyote Point's FTP site

onto your Equalizer.

Follow the instructions provided to unpack and install the file set.

Shut down Equalizer and reboot the machine. (For information about how to safely

shut down Equalizer, see "Shutting Down Equalizer" on page 52.)

The authoritative nameserver(s) for the domains that are to be geographically load

balanced must be configured to delegate authority to the Envoy sites. Each of the fully-

qualified subdomains to be balanced need to be delegated.

Equalizer Installation and Administration Guide

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