Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 374)

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101

Server Health Check Probes

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

returned data against an expected result.

Enabling/Disabling ACV Probes

Enable/Disable ACV Probes in the GUI

1. Click on a server pool name in the left navigational pane.

2. Enable ACV by typing a response string into the ACV Response edit box.

3. Disable ACV by clearing the contents of the ACV Response edit box or leaving it blank.

4. Click on Commit.

Enable/Disable ACV Probes in the CLI

1. To enable ACV probes for all TCP type servers in a server pool enter:

eqcli > srvpool spname acvr string

2. To disable ACV probes for all TCP type servers in a server pool enter:

eqcli > no srvpool spname acvr

Setting ACV Query and Response Strings

Specifying an

ACV Query

and an

ACV Response String

basically automates the exchange shown in "Active

Content Verification (ACV) Probes" on page 373. 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 Query

and you can set the

Response String

to some text, such as

“Welcome” in the example in "Active Content Verification (ACV) Probes" on page 373, which 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 of the components in 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.

For most applications, only an ACV response string is needed - Equalizer connects to the probe port on the server

instance and waits for a response.

Some applications may require input on the connection before a response is sent back to Equalizer. The ACV

query string is used for this purpose - if it is non-empty, the ACV query string is sent after the server instance

connection is established.

An ACV query or response string:

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