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COMMS-CORE_1795's avatar
COMMS-CORE_1795
Icon for Nimbostratus rankNimbostratus
Feb 01, 2016

2 actions in the same rule: redirect + load balance

Hi all,

 

I need to make an iRule whose behaviour is:

 

1.- When the web starts with "/a/b" redirect to "/b" AND balance to the pool POOL_x.x.x.x_8090 2.- When the web starts with "/a/" redirect to "/" AND balance to the pool POOL x.x.x.x_8090

 

I managed to do it with 2 irules:

 

First: redirect

 

when HTTP_REQUEST { if { [HTTP::uri] starts_with "/a/b" } { HTTP::redirect "http://[HTTP::host]/b" } elseif { [HTTP::uri] starts_with "/a" } { HTTP::redirect "http://[HTTP::host]/" } }

 

Second: Balance

 

when HTTP_REQUEST { set myURL [HTTP::uri] if { $myURL starts_with "/" } { pool POOL_x.x.x.x_8090 } elseif { $myURL starts_with "/b } { pool POOL_x.x.x.x_8090 } }

 

But I must consolidate in the same iRule,

 

Any ideas?

 

Regards

 

application delivery
iRules
LTM

6 Replies

  • COMMS-CORE_1795's avatar
    COMMS-CORE_1795
    Icon for Nimbostratus rankNimbostratus
    Feb 01, 2016

    Hi Pete,

     

    I´m new in iRules, Can you be more especific? With an example,

     

    Thanks in advanced

     

  • PeteWhite's avatar
    PeteWhite
    Icon for Employee rankEmployee
    Feb 01, 2016

    How about this:

    when HTTP_REQUEST {  
    if { [HTTP::path] starts_with "/a/b" } { 
        pool POOL_ABC
        set HTTP::path "/"
    } elseif { [HTTP::path] starts_with "/b } { 
        pool POOL_XYZ
        set HTTP::path "/"
    } 
}
  • Charles_Lamb's avatar
    Charles_Lamb
    Icon for Nimbostratus rankNimbostratus
    Feb 01, 2016

    By changing the path and selecting which pool to go to you are negating the need for a redirect.

     

    You would only want to use the redirect if you needed to send a traffic to a completely different host that is not hosted on this F5.

     

  • Kai_Wilke's avatar
    Kai_Wilke
    Icon for MVP rankMVP
    Feb 01, 2016

    Hi Comms-Core,

    you can chain as many conditions in a single 

    [if]
    command by using 
    elseif
    or 
    else
    conditions. The most restictive conditions are evaluated first followed by the least most restictive conditions.

    Based on your provided requirements, the 

    [if]
    command would look like this. 

    when HTTP_REQUEST {
     Format the URI tolower to negate the CASE while comparing the requested URIs
    set low_uri [string tolower [HTTP::uri]]
     Evalute the contition step-by-step. Starting with the most restrictive condition...
    if { $low_uri starts_with "/a/b" } then { 
        HTTP::redirect "http://[HTTP::host]/b" 
    } elseif { $low_uri starts_with "/a" } then { 
        HTTP::redirect "http://[HTTP::host]/" 
    } elseif { $low_uri starts_with "/b" } then { 
        pool POOL_1.1.1.1_8090
    } else {
         The else condition will catch everything else (e.g. /*)
        pool POOL_2.2.2.2_8090
    }
}

    Cheers, Kai