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

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1

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

2

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" 
             } 
        }
 }
3

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.

4

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.

5

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…

6

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.

7

I guess, you are looking something like this. Just validate it n update us..

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"  { HTTP::uri "[HTTP::uri]"
    pool XYZ }
  default     {   HTTP::uri "[HTTP::uri]"
 pool big_pool }
}

if { $static::Pool_select_debug eq 1 } {
log local0. "[IP::client_addr] with URI of [HTTP::uri] went to XYZ Pool" 
         } 
       }
}
8

Apologies, I did not explain the issue correctly, the above two Irules have no failures on the GUI Stats, but in the logs of /var/log/ltm, it is logging other uris went to xyz pool but no logs for the /someuri went to xyz pool.

9

I was on vacation, could not test my rule.

“/someuri” { HTTP::uri “[HTTP::uri]” -------> At here, I need something like URI starts with “/cars/name” and ends with “/brand” in the switch glob. I really appreciate the help. Thanks in advance.