5.1

Option Description
ROUND_ROBIN
Each server is used in turn according to the weight assigned to it. This is the
smoothest and fairest algorithm when the server's processing time remains
equally distributed.
URI
The left part of the URI (before the question mark) is hashed and divided by
the total weight of the running servers. The result designates which server
will receive the request. This ensures that a URI is always directed to the
same server as long as no server goes up or down.
3 (Optional) Change the default port for each enabled service, if necessary.
4 Repeat Step 1 through Step 3 for each additional service to enable for the pool.
5 Click Next.
Define Health Check Parameters
A health check checks that all servers in the server pool are alive and answering queries.
vShield Edge supports three health check modes.
Option Description
TCP TCP connection check.
HTTP The GET / default method is used to detect server status. Only responses 2xx and 3xx are valid. Other responses
(including a lack of response) indicates a server failure.
SSL Tests servers using SSLv3 client hello messages. The server is considered valid only when the response contains
server hello messages.
Procedure
1 In the Health Check page of the Add pool wizard, change the monitor port if required for each service
that is to be supported by this pool.
The health check monitor port is also used as the service port.
2 Select the health check mode for each service.
3 The table below lists the health check parameters. You can change the default values if required.
Parameter Description
Interval Interval at which a server is pinged.
Timeout Time within which a response from the server must be received.
Health Threshold Number of consecutive successful health checks before a server is declared operational.
Unhealth Threshold Number of consecutive unsuccessful health checks before a server is declared dead.
4 For HTTP, type the URI referenced in the HTTP ping requests.
5 Click Next.
Add Servers
Add backend servers to the pool.
Procedure
1
In the Members page of the Add Pool wizard, click the Add ( ) icon.
2 Type the IP address of the server.
3 Type the weight to indicate the ratio of how many requests are to be served by this backend server.
Chapter 9 vShield Edge Management
VMware, Inc. 137