Extreme Networks Px Series, Руководство по установке и настройке

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Px Series Application Switch Installation and Configuration Guide 9-1
9 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.