Forum Discussion

Wackitron_36350's avatar
Wackitron_36350
Icon for Altocumulus rankAltocumulus
Jul 23, 2018

When HTTP Request has specific hostname and URI, redirect to diff Pool

Hi All,

 

I have been trying to make this below IRule work, But no success. My Client's requirement is to redirect HTTP Traffic for specific Host URL and specific URI to a different Pool. But I am constantly getting this error: TCL error: /Common/poolname - extra switch pattern with no body while executing "switch -glob [string tolower [HTTP::uri]] { "/someURI" { pool "XYZ" } if {$..."

 

when RULE_INIT { set static::Poolxyz_select_debug 1 log local0. "Poolxyz_select" } when HTTP_REQUEST { if {[string tolower [HTTP::host]] starts_with "api-dev" } { switch -glob [string tolower [HTTP::uri]] { "/someURI" { pool XYZ } if {$static::Pool_select_debug eq 1} {log local0. "[IP::client_addr] with URI of [HTTP::uri] went to XYZ Pool"} } } }

 

Please help me out, I am kind of new to switch statement, tried using it different ways but still no success. Thank you in advance.

 

Abe

 

cloud
iRules
LTM
  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Icon for Noctilucent rankNoctilucent
    Jul 23, 2018

    Slight modified existing iRule. you can write something like below....

        when RULE_INIT {
     Change to "1" to enable debugging log statements
    set static::Poolxyz_select_debug 0
  }

when HTTP_REQUEST {
    if {[string tolower [HTTP::host]] contains "api-dev" } {
     switch -glob [string tolower [HTTP::uri]] {
      "/someuri" { pool XYZ }
       default     { pool big_pool }
    }

    if { $static::Pool_select_debug eq 1 } {
    log local0. "[IP::client_addr] with URI of [HTTP::uri] went to XYZ Pool" 
             } 
        }
 }
    • Wackitron_36350's avatar
      Wackitron_36350
      Icon for Altocumulus rankAltocumulus
      Jul 23, 2018

      Thank You for the quick response. It looks like this above IRule is working, I do not see the failures on the Statistics Tab. But on the /var/log/ltm, It is hard to trace the URI being redirected to diff pool. Because Other URIs which we did not mention in the Irule also logged as IP with /xyz or /someuri went to the XYZ Pool. It would be easier if we set up a variable for the Pool.

       

      Thank You again for the help.

       

    • Samir_Jha_52506's avatar
      Samir_Jha_52506
      Icon for Noctilucent rankNoctilucent
      Jul 23, 2018

      Cool, because traffic is going to default pool if uri didn't match. Plz modify URI in lower case('/someuri') and comments these lines in iRule. Rest no change...

       default { pool big_pool }

      Update the comments... Cheers...

    • Wackitron_36350's avatar
      Wackitron_36350
      Icon for Altocumulus rankAltocumulus
      Jul 23, 2018

      Thanks again, I will do that. Also wondering If we can log someruri to XYZ Pool and the rest uris to default pool. Makes lot easier for debugging. Also I will ask the QA to run the tests tomorrow and confirm here if it was successful.

       

  • Simon_Blakely's avatar
    Simon_Blakely
    Icon for Employee rankEmployee
    Jul 23, 2018

    It looks like you have incorrectly balanced braces.

    Try: 
    when RULE_INIT {
  set static::Poolxyz_select_debug 1 
  log local0. "Poolxyz_select" 
}
when HTTP_REQUEST { 
  if {[string tolower [HTTP::host]] starts_with "api-dev" } { 
    switch -glob [string tolower [HTTP::uri]] { 
      /someURI { 
        pool XYZ
        if {$static::Pool_select_debug eq 1} {
          log local0. "[IP::client_addr] with URI of [HTTP::uri] went to XYZ Pool"
        }
      }
    }
  }
}

    I think this is the logic you are trying to implement.