Extreme Networks Px Series - Manual (Page 102)

9-4 Px Series Application Switch Installation and Configuration Guide
Configuring Health Checks
Before health checks can be configured, make sure that the server group that they will
apply to has been created. See Chapter 5 for information on configuring server groups.
Types of Health Checks
Only the highest protocol health check is done for a server group. For example, if TCP
open is configured, the ping health check is not done. Similarly, if an HTTP check is
being done, no TCP open or ping check is done.
To configure ping checks, use the following command:
config server-group name sg1 health-check ping
For TCP open checks, use the following command:
config server-group name sg1 health-check tcp-open
To check for a return code, add the following command:
config server-group name sg1 health-check tcp-open return “HELLO”
HTTP health checks are configured in a similar manner. To do a “head /” on the server,
simply configure the following:
configure server-group name extr health-check http
To request a certain object, use the following command:
config server-group name sg1 health-check http object index.html
To ensure that object contains the specified string, use the following command:
config server-group name sg1 health-check object index.html return
“Welcome”
Timers and Counters
To configure the global timers for health check, use the following commands:
config health-check interval
config health-check retry-interval