How to identify which CacheFlow appliance is processing a request
In a load balanced environment, a request can be processed by any of the CacheFlow appliances in the group. It is useful in various circumstances to determine which CacheFlow in the group is processing requests for a specific URL.
Identify the CacheFlow appliance that handles a particular URL by creating a policy rule to return an exception page when a request matches a specific identifier phrase. The exception page will specify the IP address of the CacheFlow appliance that handled the request.
The policy to return the exception page identifying the appliance can be specified using the CacheFlow CLI or Policy GUI.
To create the policy using the CLI:
CF5000#inline policy local _oef_
Warning: If the local policy file is non-empty before making the above change, ensure that you first copy and re-apply the existing local policy as part of the inline command.
To create the policy using the Policy GUI:
1. Access the CacheFlow GUI at https://<CF-IP>:8082/ and click on the Tools tab.
17. Apply this policy by clicking the Install Policy button.
Once policy has been installed, request a website from a browser and include the obscure phrase. For example, if the obscure phrase is “~~identify_cacheflow~~”, then to identify the CacheFlow appliance that handles requests for www.bluecoat.com make a request for
The response will be an exception page containing the IP address of the CacheFlow appliance that processed the request.
It is important to use an obscure, unique phrase that is unlikely to be an actual website address. This will prevent users from hitting unintentional exception pages.
Since each request is independently load-balanced, this appliance determination method will only work with destination or domain hashing. If URL hashing is used, this method cannot reliably determine the correct CacheFlow appliance.
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