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irule for pool selection based on URI

Shurton
Nimbostratus
Nimbostratus

I lifted this portion of an irule from a bigger one used elsewhere and I can't get the syntax right.

I basically need the URI examined, and if it matches one in the list (test1, test2,test,3) then forward to pool ONPREM, otherwise send to pool CLOUD.

 

 

when HTTP_REQUEST {

   set host [HTTP::host]

   set uri [HTTP::uri]   

 

   switch -glob [string tolower $host] {

      "HOSTNAME" {

         switch -glob [string tolower $uri] {

            "/test1*" -

            "/test*" -

            "/test3*" -

            {

               pool ONPREM

            }   

               else {

            pool CLOUD

            }

 

3 REPLIES 3

 Best option for this would be using LTM Policy. But still you can even try below iRule.

 

 

when HTTP_REQUEST {

 

if {([HTTP::uri] contains "test1") || ([HTTP::uri] contains "test2") || ([HTTP::uri] contains "test3")} {

 

  pool ONPREM

} else {

  pool CLOUD

}

}

 

 

Hope it helps!

Mayur

Shurton
Nimbostratus
Nimbostratus

​Thank you!

JRahm
Community Manager
Community Manager

As an alternative, many are unaware of the matches_glob operator, which would be of great use in this case:

when HTTP_REQUEST { if {[HTTP::uri] matches_glob {*test[123]*} } { pool ONPREM } else { pool CLOUD } }

Not only does it simplify the condition, but it reduces the character count to be stored, and it also saves a few thousand CPU cycles per iteration compared to the other solution.

 

Another thing I'd note is the URI is if you want this to be case insensitive, you can either change your glob match for the test characters, or easier, use string tolower around the URI command.

 

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