Coyote Point Systems Equalizer, Installation And Administration Manual

Page: 40 / 144

Chapter 3:Configuring Equalizer
30 Equalizer Installation and Administration Guide
To verify that a server’s routing is configured correctly, run
traceroute
on the server
with a destination address outside the internal network. If you are using a two-network
configuration, Equalizer's internal address should be listed as the first step in the
traceroute
output.
Failover Configuration
A second Equalizer can be configured as a hot backup so that if the Equalizer that’s
currently handling requests fails, the backup automatically takes over.
The Equalizer that’s actively handling requests is the primary unit and the hot spare is the
backup unit. Each Equalizer is configured to default to either the primary or backup role.
When a failed unit comes back online, it assumes the backup role, even if it is designated
the default primary.
To set up a failover configuration, you use the Equalizer administration interface. For more
information, see “Setting up a Failover Configuration” on page 51.
Testing Your Configuration
Once you’ve installed and configured Equalizer and your servers, perform these tests to
verify that it is working as intended.
To perform these tests, you need:
■
A test machine on the internal network—the same physical network as the servers.
(This can be one of the server machines.)
■
If you have a two-network configuration, a test machine on the external network.
■
A client machine somewhere on the Internet, to simulate a “real-world” client. This
machine should be set up so that the only way it can communicate with your servers
or Equalizer is through your Internet router.
1. From the internal-network test machine, ping the physical IP address of each server.
You should be able to successfully ping all of the servers from the test machine.
2. From the internal-network test machine, ping the server aliases on each of the servers.
You should be able to successfully ping all of the servers from the test machine using
their aliases.
3. From the internal test machine and each of the servers, ping the Equalizer address that
you are using as the default gateway on your servers. (If you are using a two-network
topology, this will be Equalizer’s internal address or failover gateway address.
4. From the internal-network test machine, telnet to the server aliases on service ports of
running daemons. You should be able to successfully telnet to the server aliases.
5. If you are using a two-network configuration, from the external-network test machine,
ping a physical server IP address using
ping -R
to trace the route of the ping. The
Equalizer IP address should appear in the list of interfaces that the ping packet
traverses. The traceroute tool can also be used to perform this test.
6. If you are using a two-network configuration, after you have configured a virtual
cluster and added servers, telnet to each of the virtual clusters configured on the