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Px Series Application Switch Installation and Configuration Guide 9-1

Health Checks

This chapter describes health checks you can use to ensure that a given application is

running on a real server before sending user requests to that server. The chapter

contains the following sections:

• Overview on page 9-1

• Health Checking Procedure on page 9-3

• Configuring Health Checks on page 9-4

Overview

Because each application works differently, the application switch supports the

following types of health checks:

• ICMP Ping— Ensures that the host is reachable. In general, this does not provide

any information about application health, but provides the simplest check.

•TCP Open —Opens a connection to a specified TCP/IP port. Optionally, the

application switch can compare the response sent upon open to a preconfigured

string to further ensure that the application responded correctly.

• HTTP GET — Sends an actual “HTTP GET” request to the server. Optionally, the

application switch can compare the response sent upon open to a preconfigured

string to further ensure that the application responded correctly.

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Extreme Networks Px Series Spécifications Page 99