Specifications

Managing Servers
Equalizer Installation and Administration Guide 89
4. Enter server name, which is the server’s logical name, or accept Equalizer’s default. Each
server in a cluster must have a unique name that begins with an alphabetical character, not a
numeral (for example, Phoenix).
5. Enter ip which is the IP address of the server endpoint you are adding to the cluster.
6. Enter port, which is the port number of the service on the server machine. Unless you want to
set up port redirection, you can usually accept the default value, which is the same as the port
of the virtual cluster.
If a port range has been defined for the server’s cluster (see Step 6 on page 68, under “Adding
a Virtual Cluster”), then the port field in the add server or modify server screen refers to the
first port on which to start servicing the cluster start_port. For example:
If there is no service running on one or more ports in the port range, Equalizer will still attempt
to forward traffic to that port and return an error code to the client, just like what would happen
if the client was connecting to the server directly.
7. Enable the advanced flag at the bottom of the screen to set a value for probe_port. The default
is 0, which means that the server will use the value in the port field (see above) as the
probe_port. Change this value if you want to use another port for health check robes form the
Equalizer. (Note that the probe_port on the Equalizer is set in the cluster menus; see “Advanced
Cluster Fields and Flags” on page 71.)
8. Enable the advanced flag at the bottom of the screen to set a value for max_conn. This sets the
maximum number of connections for the server, and overrides the max_conn setting for the
cluster (if any). See “Setting Maximum Connections per Server” on page 94 for more
information.
9. Enter weight, which determines a starting point (static weight) for the percentage of requests to
route to each server. For information about selecting an appropriate static weight, refer to
“Adjusting a Server’s Static Weight” on page 90.
10. Enable the hot spare check box if you plan to use this server as a backup server, in case the
other servers in the cluster fail. Checking hot spare forces Equalizer to direct incoming
connections to this server only if all the other servers in the cluster are down. You should only
configure one server in a cluster as a hot spare.
Note – Equalizer performs all the encryption and decryption for HTTPS clusters, so traffic
between the Equalizer and the servers in an HTTPS cluster uses the HTTP protocol.
When you add servers to an HTTPS cluster, you should configure them on port 80.
Cluster Port Range Server Port
Port Mapping
(external to internal)
start_port = 80
end_port = 90
80
80 to 80
81 to 81
...
90 to 90
start_port = 80
end_port = 90
100
80 to 100
81 to 101
...
90 to 110