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Tom_B_90541's avatar
Tom_B_90541
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Mar 26, 2012

irule too long

Greetings all. 9.4.X irule issue. We seem to have hit the character limit (KB SOL9204). Our irule looks like this:

 

 

when HTTP_REQUEST {

 

if {[HTTP::uri] starts_with "/test"} {pool pTest}

 

elseif {[HTTP::host] == "clienta.webdomain.com"} {pool pClienta}

 

elseif {[HTTP::host] == "clientb.webdomain.com"} {pool pClientb}

 

 

and it continues with a new "elseif" statement for each client. We have been able to free some space by removing a couple redundant or unnecessary lines, and that helps for the next week or so, but we need a long-term solution. I hope to avoid creating another virtual server. I have seen you can assign multiple irules to a virtual server, but I have not yet been successful in testing to get it to work. In a situation like the irule above, is it possible to have multiple irules? How would you make it work? Thanks in advance for any advice.

2 Replies

  • Hi Tom,

     

     

    The best option would be to move the hostname to pool name mappings to a data group. In 9.4.x you could use findclass to look up the requested host header in the data group and return the pool name.

     

     

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

     

     

    A less ideal option would be to replace the if/elseif/elseif.../else chain with a switch statement. This should save you some characters in the iRule.

     

     

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

     

     

    Aaron
  • Thanks hoolio. I'll check these out and see which option may work best in my environment.