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Forum Discussion

Sirisha_126707's avatar
Sirisha_126707
Icon for Nimbostratus rankNimbostratus
Feb 07, 2017

Redirection

I am new to the iRules , We need to create an irule that forwards requests coming into   https://abc.co.uk to go to https://www.xyz.co.uk   initially we only need 1 in 10 requests to be forwa...
application delivery
iRules
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Feb 07, 2017

Hi Sirisha,

you may use the iRule below as a starting point... 

when RULE_INIT {
    set static::load_value 10   ; Load Value in % percent (0-100 is valid)
}
when HTTP_REQUEST {
    if { ( [string tolower [HTTP::host]] eq "abc.co.uk" ) 
     and ( [expr { int(rand()*100) }] < $static::load_value } then {
        HTTP::redirect "https://www.xyz.co.uk"
    }   
}

Note: The 

[expr { int(rand()*100) }]
syntax generates a random number in the range of 
0-99
. If the generated number (e.g. 
0-9
) is lower than the value of 
$static::load_value
(e.g. 
10
), the request will become redirected to the new URL (e.g. https://www.xyz.co.uk). If the the generated number (e.g. 
10-99
) is higher than or equals the value of 
$static::load_value
(e.g. 
10
), the iRule will do nothing and let the request silently pass...

Cheers, Kai