iRules HTTP_RESPONSE based on Pool?

Here's the HTTP_RESPONSE wiki which also contains available commands:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/HTTP_RESPONSE.html

 

 

Do the servers in your HTTP and Gopher pools share the same IPs? If they don't, you could look at IP::server_addr and rewrite based on that.

Hi Chris,

 

 

Yeah, I was hoping to avoid having to define the pool members in the iRule itself, then having two separate places to worry about in terms of keeping pool members updated. If I add a server into a pool, I'd have to remember to add the server into the pool list variable in the iRule.

 

 

The HTTP_REPONSE wiki page doesn't seem to have any way to define an action to be taken depending on the pool that the HTTP_REQUEST was sent to.

I suppose you could set a variable in the LB_SELECTED event that you check for in your response event...

Hi Tony: would it be possible to simply set a variable in your HTTP_REQUEST event that you reference on HTTP_RESPONSE? For example, you've already made a decision to send some traffic to one pool or the other based on uri, so you should be able to do this.

 

 

Here's some non-tested, free form code as an example.

 

when HTTP_REQUEST {
  if {HTTP::uri equals '/foo'} {
    set selected 'gopher'
    pool gopher
    }  else { 
    set selected 'http'
    pool http
    }
}
when HTTP_RESPONSE {
  log local0. "This response is coming from pool $selected..."
}

 

I'm sure I've got a fat-finger or two in here but hopefully it'll give you an idea of what I am thinking here.

 

 

-Matt

By the way you could also use LB::server in the request event to set the pool name of the node, if I recall...so it would look something like:

set selected [LB::server pool]

...but the first option may make more sense.

-Matt