Extreme Networks Px Series manual Health Checks, Overview

9Health 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.

Px Series Application Switch Installation and Configuration Guide 9-1