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sunnyman67_1367's avatar
sunnyman67_1367
Icon for Nimbostratus rankNimbostratus
Nov 03, 2013

URL rewrite through iRule

Hi Guys, i have one "Performance (HTTP)" virtual server on F5-1600 series, and i want to change the URL "http://www.abc.com" to "http://partner.abc.com/xyz". i have tried all below scripts :   1- ...
application delivery
availability
BIG-IP Access Policy Manager (APM)
devops
iRules
management
performance
security
  • IheartF5_45022's avatar
    IheartF5_45022
    Nov 11, 2013

    Hi Sunnyman,

    This will work;

    if { [IP::addr [IP::client_addr] equals 1.1.1.1] || [IP::addr [IP::client_addr] equals 1.1.1.2} { 
    SNAT with 1.1.1.100
    snatpool VM_SNAT_POOL_1_1_1_100
} elseif { [IP::addr [IP::client_addr] equals 1.1.1.11] || [IP::addr [IP::client_addr] equals 1.1.1.12} { 
    SNAT with 1.1.1.100
    snatpool VM_SNAT_POOL_1_1_1_200
}

    But that's not a very scalable way of doing it if your list is going to grow. If it's going to grow then use an address datagroup, with values snatpool names, which you can use like this

    snatpool [class match -value [IP::remote_addr] equals dg_sunnyman_snatpools]

    or more correctly;

    set snatpool [class match -value [IP::remote_addr] equals dg_sunnyman_snatpools]
if {$snatpool ne "") {
    snatpool $snatpool
 }
IheartF5_45022's avatar
IheartF5_45022
Icon for Nacreous rankNacreous
Nov 04, 2013

Hi Sunnyman,

No you are not quite right - while it's perfectly valid to include an IP/port number within a Host: header, this does not tell the F5 where to send the traffic. You need to use the node or pool command to inform TMOS where to send traffic. This is the most obvious way using node;-

if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
    HTTP::header replace Host "partner.abc.com"
    node 1.1.1.1 8080
    HTTP::uri "/xyz"
}

Now having said that, it's not the way I would do it. You should include member 1.1.1.1:8080 in a pool, ie pl_sunnyman_8080 with an appropriate healthcheck and then instruct the F5 to send to the pool;-

if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
    HTTP::header replace Host "partner.abc.com"
    pool pl_sunnyman_8080
    HTTP::uri "/xyz"
}

The reason this is better is that by having your server in a pool with an appropriate healthcheck, you can have multiple servers in the pool for backup, and also TMOS will already know the state of the servers in the pool, so will only choose one that is UP.