MACROMEDIA COLDFUSION 4.5-ADMINISTRING COLDFUSION SERVER Manual page 231

Chapter 6: Creating Scalable and Highly Available Web Sites
The probe is a high availability feature that verifies that the ColdFusion Server is
running properly on your clustered servers. It periodically tests a specific ColdFusion
URL over periodic intervals and verifies its validity against a user-defined string
contained in the returned page.
If the validation test succeeds, inbound HTTP requests will continue to be sent to the
server for which a probe exists. However, if the test fails (the URL fails, times out, or
does not return the user-specified string in the page accessed), ClusterCATS restricts
the server and redirects requests to other available servers in the cluster. The restricted
server will become available as soon as the probe returns a valid value.
Additionally, if the ColdFusion Server ever hangs or fails, ClusterCATS automatically
attempts to recover the failed service. Once the ColdFusion service is recovered, the
probe will automatically restart the ColdFusion Server and send HTTP traffic to the
server.
To configure a ColdFusion probe:
1. Open the ClusterCATS Explorer and select the server for which you want to create
a ColdFusion probe.
2. Choose New Monitor from the Server menu. Alternatively, you can right-click the
server and select New Monitor.
The New Monitor dialog box appears in front of the Probe Properties dialog box.
Note
The ColdFusion service must be running on your server in order for
the probe you are creating to work.
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