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Angelo_5130's avatar
Angelo_5130
Icon for Nimbostratus rankNimbostratus
Oct 22, 2010

iRule to rewrite domain not working:(

Hi all,

 

 

I am very new to iRules and I was trying to write an iRule to rewrite the domain in the cookie inserted by the LTM default cookie persistence profile.

 

 

- Virtual Server is defined as HTTPS and the default HTTP profile is associated to it

 

- A Cookie persistence profile is associated to the virtual server:

 

- Parent profile: cookie

 

- Cookie Method: Insert

 

- Cookie name: My_cookie

 

 

By searching in the the forum I found the following:

 

 

when HTTP_RESPONSE {

 

Check if the persistence cookie exists in the response

 

if {[HTTP::cookie exists "My_cookie"]} {

 

set the domain attribute on the persistence cookie

 

HTTP::cookie domain "My_cookie" ".mydomain.com"

 

}

 

}

 

 

 

However, when I try to apply the iRule I see that no cookie at all is sent back (instead of the My_cookie one).

 

 

Does anybody have an idea on what might be causing this?

 

 

Thanks a lot in advance!
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3 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Oct 22, 2010
    Hi Angelo,

     

     

    If you configure the cookie insert persistence profile to be session based (no timeout), then LTM will only set the cookie when a load balancing decision is made. There isn't generally a need to set it on every response.

     

     

    So if you clear your cookies and retest, you should see LTM setting the cookie.

     

     

    Aaron
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Oct 25, 2010
    Hi Angelo,

    I would be surprised if using HTTP::cookie to set the domain on a cookie would cause the cookie to "disappear" from the response. Can you add a log statement before and after the HTTP::cookie command to log the Set-Cookie header values: 

    
when HTTP_RESPONSE {

   log local0. "[IP::client_addr]:[TCP::client_port]: Pre Set-Cookies: [HTTP::header values Set-Cookie]"
    Check if the persistence cookie exists in the response
   if {[HTTP::cookie exists "My_cookie"]} {
       set the domain attribute on the persistence cookie
      HTTP::cookie domain "My_cookie" ".mydomain.com"
      log local0. "[IP::client_addr]:[TCP::client_port]: Modified domain on My_cookie"
    }
   log local0. "[IP::client_addr]:[TCP::client_port]: Post Set-Cookies: [HTTP::header values Set-Cookie]"
}

    Aaron
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Oct 27, 2010
    Hi Angelo,

     

     

    Thanks for the explanation. That makes sense.

     

     

    Aaron