one difficult question in irule with repect to ratio hits or "virtual pools"?

Hi Robbie,

 

 

You can use a session cookie to track whether a request should go to a specific pool. You can set the cookie in HTTP_RESPONSE using 'HTTP::cookie insert $cookie_name value $cookie_value path / domain $domain'. You can check for the cookie in HTTP_REQUEST using [HTTP::cookie value $cookie_name].

 

 

If you want to "randomly" send x% of requests without a cookie to a specific pool, you can use rand(). The third example in this codeshare entry shows how to implement what you've described.

 

 

Example 3 - Send 90% of requests to poolA, 5% to poolB and 5% to poolC. Use a session cookie to persist clients to the same pool over their HTTP session

 

https://devcentral.f5.com/wiki/iRules.ratio_load_balancing_using_rand_function.ashx

 

 

If you want to prevent users from manually specifying the pool they go to, you could encrypt the cookie using a custom HTTP profile and the cookie to encryption option.

 

 

Aaron