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PSPK's avatar
PSPK
Icon for Nimbostratus rankNimbostratus
May 20, 2015

Reverse Proxy Setup

Hi I have an external URL...www.foxrun.com

 

I have 3 pool members aa1:80, aa2:80 and aa3:80

 

I configured a VIP foxrun:80 with pool of those 3 members

 

Each pool member has an internal url for the application on port 80

 

http://aa1.foxrn.com/ , http://aa2.foxrun.com/ , http://aa3.foxrun.com/

 

Now when the user hits www.foxrun.com and the VIP forwards to any of the available members but on seeing the www.foxrun.com in the payload the member server will drop the packets...

 

So i have to rewrite or replace the host name in the payload from www.foxrun.com to aa1.foxrun.com or aa2.foxrun.com etc. for which i have to use an irule..

 

Could some help me writing the irule..

 

Thanks in advance..

 

application delivery
design
devops
irules
LTM

1 Reply

  • cjunior's avatar
    cjunior
    Icon for Nacreous rankNacreous
    Jun 08, 2015

    Hi,

    I made an example to do this trick based on the server IP address.

    To do it with node's name, I think you must create a data group with servers name as values and IP as key then check it in switch statement.

    You must associate a stream profile in the VS.

    Regards. 
    when CLIENT_ACCEPTED {
     ensures the server informations to the HTTP_REQUEST event.
    LB::connect
}

when HTTP_REQUEST {
     stores the current host header value
    set request_host "[HTTP::header Host]"

     checks the member by address:port
    switch "[LB::server addr]:[LB::server port]" {
        "10.10.10.1:80" {
            set rewrite_host "aa1.foxrun.com"
        }
        "10.10.10.2:80" {
            set rewrite_host "aa2.foxrun.com"
        }
        "10.10.10.3:80" {
            set rewrite_host "aa3.foxrun.com"
        }
        default {
            set rewrite_host ""
        }
    }

     If found, change their request.
    if { $rewrite_host ne "" } {
        STREAM::disable
        HTTP::header remove "Accept-Encoding"
        HTTP::header replace "Host" $rewrite_host
    }
}

when HTTP_RESPONSE {
    if { [HTTP::header value "Content-Type"] contains "html" and $rewrite_host ne "" } {
         replaces the content with the previous request host header
        STREAM::expression "@$rewrite_host@$request_host@"
        STREAM::enable
    }
}