Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 233)

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Equalizer can perform the same exchange automatically and verify the server’s response by checking the returned

data against an expected result.

Specifying an ACV probe string and an ACV response string basically automates the above exchange. Equalizer

uses the probe string to request data from each server. To verify the server’s content, Equalizer searches the

returned data for the response string. For example, you can use “GET /index.html” as the ACV probe string and

you can set the response string to some text, such as “Welcome” appears on the home page.

Similarly, if you have a Web server with a PHP application that accesses a database, you can use ACV to ensure

that all the components of the application are working. You could set up a PHP page called test.php that accesses

the database and returns a page containing “ALL OK” if there are no problems.

Then you would enter and ACV Query and an ACV Response String using either the CLI or GUI. :

If the page that is returned contains the correct response string in the first 1000 characters, including headers) the

server is marked “up”; if “ALL OK” were not present, the server is marked down.

The response string should be text that appears only in a valid response. This string is case-sensitive. An example

of a poorly chosen string would be “HTML”, since most web servers automatically generate error pages that

contain valid HTML.

For more information on probing, see "Active Content Verification (ACV) Probes" on page 373.

Server Pool Summary (GUI)

When you click on Server Pools from the left navigational pane on the GUI the Server Pool Summary screen

shown below will be displayed in the right frame. It displays the health checks defined for each configured server

pool, the server instances using the health checks, status icons and the option to add new health checks and the

ability to add new server pools as described in "Adding and Configuring a Server Pool (GUI)" on page 234.

For details on configuring health checks refer to "Configuring VLB Health Check Probe Parameters" on page 386.

Clicking on the icon will activate the shown on where you can add a new server pool to your Equalizer

configuration. This is the same as if you selected Add Server Pool to the Server Pool branch on the left

navigational pane.

Clicking on the icon while a server pool is selected will activate the

Server Pool Configuration Required

Screen

shown on where the server pool configuration parameters can be edited.

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Equalizer Administration Guide

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