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Using Envoy

Overview of Envoy® Geographic Load

Balancing

Geographic load balancing increases availability by allowing regional server clusters to share workload

transparently, maximizing overall resource utilization. The Envoy® Geographic load balancer is an optional

software add-on for the Equalizer product line that supports load balancing requests across servers in different

physical locations or on different networks.

An Envoy-enabled web site is a geographic server cluster, composed of regional clusters. Each regional cluster is

composed of servers that provide a common service, supervised by an Equalizer running Envoy. For example, the

web site www.coyotepoint.com might be supported by three regional clusters, located in California, New York

City, and London. An Equalizer running Envoy software and web servers with similar content are deployed at each

of these locations.

In non-Envoy Equalizer configurations, there is a one-to-one correspondence between a cluster and a website:

when a client makes a request for a website (say, www.example.com), the client uses the Domain Name Service

(DNS) to resolve the website name to an IP address. For a website that is load balanced by an Equalizer, the IP

address returned is the IP address of an Equalizer cluster. After resolving the name, the client sends the request to

the cluster IP. When Equalizer receives the client request, it load balances the request across the server pool in

the cluster, based on the current load balancing policy and parameters.

In an Envoy conversation, you have two or more Equalizers located in separate locations. Each Equalizer and its

set of clusters and servers forms a site (or Envoy site. With Envoy, the website name in the client request is

resolved to a

GeoCluster IP

. A GeoCluster is analogous to a cluster, but one level above it: in other words, a

GeoCluster actually points to two or more clusters that are defined on separate Equalizers.

In the same way that Equalizer balances requests for a cluster IP across the server pool in the cluster, Equalizer

load balances a request for a GeoCluster IP across the clusters in the GeoCluster configuration. Once a site is

chosen and the client request arrives at that site, the request is load balanced across the servers in the appropriate

cluster. In this way, you can set up geographically distant Equalizer's to cooperatively load balance client

requests.

Envoy on EQ/OS 10 can only interoperate with Envoy running on other units running

EQ/OS 10, and does NOT interoperate with Envoy running on EQ/OS 8.6 (or earlier

Envoy Configuration Summary

Follow this general procedure when setting up Envoy for the first time:

1. Configure appropriate clusters (and servers) on all of the Equalizers to be included as Envoy sites in the

GeoCluster.

2. Configure the GeoCluster on each Equalizer; the parameters used should be the same on all sites. This

includes creating GeoSites and adding GeoSite Instances to the GeoCluster. (Refer to "Configuring

GeoClusters" on page 518 and "Configuring GeoSites" on page 526 for details.)

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Coyote Point Systems Equalizer Especificaciones Pagina 514