Specifications

Chapter 9: Administering Geographic Clusters
152 Equalizer Installation and Administration Guide
Licensing and Configuring Envoy
Each site in an Envoy geocluster must have an Equalizer that is running Envoy, which must be
licensed in order to run. Envoy software is pre-installed on each Equalizer and is enabled through
the registration and licensing process.
After you have licensed Envoy and completed Envoy and DNS configuration described in this
section, you can set up geographic clusters and define the available sites for each cluster.
Enabling Envoy
To license and enable Envoy, follow these steps:
1. Follow the registration procedure and make sure that you enter the serial number for your
Envoy software on the registration website; see “Licensing Equalizer” on page 39 in Chapter 5.
2. Shut down the Equalizer and reboot the machine; see “Rebooting Equalizer” on page 63 in
Chapter 5.
3. After the system reboots, confirm that Envoy is enabled. Log into the Equalizer Administration
Interface and select View > Equalizer Status. The line Envoy geographic load balancing
should indicate that Envoy is enabled.
Configuring the Authoritative Name Server to Query Envoy
You must configure the authoritative 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.
For example (see Figure 72), assume you must balance
www.coyotepoint.com across a
geographic cluster containing two Envoy sites,
east.coyotepoint.com (at 192.168.2.44) and
west.coyotepoint.com (at 10.0.0.5). In this case, you must configure the name servers that
will handle the
coyotepoint.com domain to delegate authority for www.coyotepoint.com to
both
east.coyotepoint.com and west.coyotepoint.com. When queried to resolve
www.coyotepoint.com, coyotepoint.com’s name servers should return name server (NS) and
alias (A) records for both Envoy sites.