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
on page 517 and
on page 522 for
details.)
3. Configure the authoritative DNS server for your website’s domain with DNS records for all
Equalizers in the GeoCluster. The DNS server returns these records to clients in response to
DNS requests to resolve the website (GeoCluster) name.
DNS Configuration
Every Web site is assigned a unique IP address. To access a website, a client needs to know what
the site IP address is. Users don't usually enter an IP address into their Web browser, but rather
enter a site's domain name instead. In order to access a requested website, a Web browser needs
to be able to convert the site's domain name into the corresponding IP address. This is where DNS
comes into play.
1. A client computer is configured with the address of a preferred DNS server.
2. A requested URL is forwarded to the DNS server, and the DNS server returns the IP address
for the requested website.
3. The client is then able to access the requested site.
Local (Caching) DNS Server
In a typical GSLB configuration a local, or caching DNS server resides in the client's LAN
environment. When the client directs the browser to get to a URL (i.e., www.coyotepoint.com) the
browser requests the local DNS to resolve the name (i.e. www.coyotepoint.com) to an IP address.
Once local DNS server resolves the name to an ip address. It will first check a root name server,
which returns a list of name servers for, say, the
.com
domain. The name servers for the domain
name space return the IP addresses of an Authoritative DNS server for the domain name. Finally,
the Authoritative DNS for the domain name returns the IP address of the web server, or in Envoy
SAE, the FQDN of a GeoCluster. For each GeoCluster to be balanced, an Authoritative Name
Server must be configured to return name server and alias records for Envoy SAE’s at every
regional site
Configuring an Authoritative DNS Name Server for Envoy
You must configure an Authoritative DNS Name Server(s) for the domains that are to be
geographically load balanced to delegate authority to the Envoy sites. You need to delegate each
of the fully-qualified subdomains to be balanced. If your DNS server is run by an Internet Service
Provider (ISP), then you need to ask the ISP to reconfigure the DNS server for Envoy. If you are
running your own local DNS server, then you need to update the DNS server’s zone file for your
Envoy configuration.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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