Global Load Balance
Overview of Envoy Geographic Load Balancing
Note
- Envoy (GSLB) is not supported on E250GX model Equalizers.
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
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).
512
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
Содержание Equalizer GX Series
Страница 18: ......
Страница 32: ...Overview 32 Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc ...
Страница 42: ......
Страница 52: ......
Страница 64: ......
Страница 72: ......
Страница 76: ......
Страница 123: ...Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc All Rights Reserved 123 Equalizer Administration Guide ...
Страница 228: ......
Страница 238: ......
Страница 411: ...Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc All Rights Reserved 411 Equalizer Administration Guide ...
Страница 459: ...Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc All Rights Reserved 459 Equalizer Administration Guide ...
Страница 476: ......
Страница 492: ......
Страница 530: ......
Страница 614: ......
Страница 626: ......
Страница 638: ......
Страница 678: ......
Страница 732: ...Using SNMP Traps 732 Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc ...
Страница 754: ......
Страница 790: ......
Страница 804: ......
Страница 842: ......
Страница 847: ...Copyright 2014 Coyote Point Systems A Subsidiary of Fortinet Inc All Rights Reserved 847 Equalizer Administration Guide ...
Страница 866: ......