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Kamalpreet_1068's avatar
Kamalpreet_1068
Icon for Nimbostratus rankNimbostratus
Aug 24, 2012

Node Selction based on Host Header

Hi ,

 

 

This is the first time i am writting here

 

I have the following scenario

 

Client sends a data to Virtual IP and having a host header "xsp-tibapp-qa-nlb.pac.com:8100"

 

Application is very specific about Host headers

 

On Server 1 - It understand Host header "xsp-tibapp-qa1.pac.com:8100"

 

On Server 2 - It Understand Host Header "xsp-tibapp-qa2.pac.com:8100"

 

I have written a Irule which can change the host header value

 

But the problem is i cannot load balance the traffic.

 

I want if i change the host header to "xsp-tibapp-qa1.pac.com:8100" it should go to Server 1

 

and if i cange it to "xsp-tibapp-qa2.pac.com:8100" it should go to Server 2

 

Irule is as follows

 

when HTTP_REQUEST {

 

 

if { [HTTP::host] equals "xsp-tibapp-qa-nlb.pac..com:8100"} {

 

HTTP::header replace "Host" "xsp-tibapp-qa1.pac.com:8100"

 

use node server1

 

}

 

}

 

 

 

 

 

 

 

 

application delivery
dev
devops
iRules
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Aug 25, 2012
    e.g. 

    [root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b pool foo list
pool foo {
   members {
      200.200.200.101:80 {}
      200.200.200.102:80 {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when LB_SELECTED {
   HTTP::header replace Host [class match -value [LB::server addr] equals host_class]
}
}
[root@ve10:Active] config  b class host_class list
class host_class {
   {
      "200.200.200.101" { "xsp-tibapp-qa1.pac.com:8100" }
      "200.200.200.102" { "xsp-tibapp-qa2.pac.com:8100" }
   }
}

 200.200.200.101

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(44440) <-> 172.28.19.79(80)
1345878448.9086 (0.0010)  C>S
---------------------------------------------------------------
HEAD /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: xsp-tibapp-qa-nlb.pac.com:8100

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(44440) <-> 200.200.200.101(80)
1345878448.9094 (0.0006)  C>S
---------------------------------------------------------------
HEAD /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: xsp-tibapp-qa1.pac.com:8100

---------------------------------------------------------------

 200.200.200.102

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(44441) <-> 172.28.19.79(80)
1345878480.0076 (0.0010)  C>S
---------------------------------------------------------------
HEAD /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: xsp-tibapp-qa-nlb.pac.com:8100

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(44441) <-> 200.200.200.102(80)
1345878480.0086 (0.0009)  C>S
---------------------------------------------------------------
HEAD /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: xsp-tibapp-qa2.pac.com:8100

---------------------------------------------------------------