Coyote Point Systems Equalizer, Руководство по установке и администрированию

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Chapter 6:Administering Geographic Clusters
86 Equalizer Installation and Administration Guide
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.
Envoy Installation and Configuration
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.
Installing Envoy
The Envoy software must be installed on each of the Equalizers that will be part of the
geographic cluster. To install Envoy:
1. Copy the Envoy executable file set from the floppy disk or Coyote Point’s FTP site
onto your Equalizer.
2. Follow the instructions provided to unpack and install the file set.
3. Shut down Equalizer and reboot the machine. (For information about how to safely
shut down Equalizer, see “Shutting Down Equalizer” on page 52.)
Configuring the Authoritative Name Server to Query Envoy
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.
Note – To perform geographic load balancing, you need to install the Envoy add-on to your
Equalizer system.