Pool selection in an iRule and VIP?

This is directed to Deb, but if anyone has more info, please feel free to comment.

I’ve seen you post a couple of times about iRules and the default pool for a VIP:

Click here

In iRules where the pool is dynamically selected, the "default" pool for traffic that falls through the rest of the conditions will be the last pool selected by the rule, rather than the default pool that is defined on the virtual server.

So if you are conditionally choosing different pools, you probably DO want to include the "else" clause specifying the intended "default" pool.

/deb

I tried testing this to see exactly how this works, but so far, I haven’t been able to figure it out. I used a simple VIP, rule and set of one node pools to test:

when HTTP_REQUEST {
   switch [HTTP::uri] {
      "/pool1" {
         log local0. "pool1"
         pool http_pool_1
      }
      "/pool2" {
         log local0. "pool2"
         pool http_pool_2
      }
      "/pool3" {
         log local0. "pool3"
         pool http_pool_3
      }
      default {
         log local0. "default: no action"
      }
   }
}

And then I used a VIP with a different pool. Each time I made requests for /pool1, the request went to pool1’s node. I went back and forth through the pools in the rule and to the VIPs pool (using a URI that didn't match the switch cases), without any unexpected results.

Can you explain what you mean in your post?

Thanks,

Aaron