multiple URI redirects

when HTTP_REQUEST {
    if { ( [string tolower [HTTP::host]] equals "hostname.com" ) and ( [class match [string tolower [HTTP::uri]] starts_with my_datagroup] ) } {
        HTTP::redirect "http://[class match -value [string tolower [HTTP::uri]] starts_with my_datagroup][HTTP::uri]"
    }
}

Keep in mind that every time you update a data group (class) the iRule may temporarily fail and/or the values will be unavailable for the duration of the update process...

The outright failure of the iRule can be mitigated relatively easily by verifying that the data class does indeed exist and putting the request on hold, but the temporary unavailability of the entries is more difficult to mitigate.

Hello,

I had to create this on a test F5 which is running version 9.4.6 before performing in production. How do I convert the iRule and Data Group from the version 11 format provided above to the version 9.4.6? I noticed that the "class match" was not available on version 9 and we believe that we have to use "matchclass" instead but we recieved the below error.

Error: "line 3: [wrong args] [matchclass -value [string tolower [HTTP::uri]] starts_with dotNet-test]"

Any help would be appreciated.

Previous irule: when HTTP_REQUEST { if { ( [string tolower [HTTP::host]] equals "hostname.com" ) and ( [class match [string tolower [HTTP::uri]] starts_with my_datagroup] ) } { HTTP::redirect "http://[class match -value [string tolower [HTTP::uri]] starts_with my_datagroup][HTTP::uri]" }

Error: "line 3: [wrong args] [matchclass -value [string tolower [HTTP::uri]] starts_with dotNet-test]"

i understand string data group in 9.x does not have "value" pair, does it? anyway, if you want, you may be able to add the value to string and parse it yourself.

sol3386: Overview of data groups

My 9.x coding is a little rusty, but I think it'd go something like this:

Data group (example: "my_datagroup")

"/parentdirectory1/ hostname1"
"/parentdirectory2/ hostname2"
...
"/parentdirectory300/ hostname300" 

iRule

when HTTP_REQUEST {
    if { ( [string tolower [HTTP::host]] equals "hostname.com" ) and ( [matchclass [string tolower [HTTP::uri]] starts_with my_datagroup] ) } {
        set newhost [findclass [string tolower [HTTP::uri]] my_datagroup " "]
        HTTP::redirect "http://$newhost[HTTP::uri]"
    }
}

shouldn't it be findclass (rather than starts_with matchclass) in if-condition?

e.g.

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.252:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b class my_datagroup list
class my_datagroup {
   {
      "/parentdirectory1/ hostname1"
      "/parentdirectory2/ hostname2"
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
  set newhost [findclass [string tolower [URI::path [HTTP::uri] 1 1]] my_datagroup " "]
  if { [string tolower [HTTP::host]] equals "hostname.com" and $newhost ne "" } {
    HTTP::redirect "http://$newhost[HTTP::uri]"
  }
}
}

[root@ve10:Active] config  curl -I http://172.28.19.252/ -H "Host: hostname.com"
HTTP/1.1 200 OK
Date: Thu, 29 Aug 2013 01:29:46 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Thu, 23 May 2013 00:28:46 GMT
ETag: "4185a8-59-c3efab80"
Accept-Ranges: bytes
Content-Length: 89
Content-Type: text/html; charset=UTF-8

[root@ve10:Active] config  curl -I http://172.28.19.252/parentdirectory1/something -H "Host: hostname.com"
HTTP/1.0 302 Found
Location: http://hostname1/parentdirectory1/something
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

Pretty sure you could do it either way. Matchclass returns a Boolean and Findclass returns a string.

I was able to get Nitass irule to work.

Is there any performance impact on the site when you have 300 lines in a data group? Just trying to get an idea of what to expect when we start to get to the last pages.

Is there any performance impact on the site when you have 300 lines in a data group? Just trying to get an idea of what to expect when we start to get to the last pages.

you may try irule timing to see how many cpu cycle irule utilizes. anyway, if your unit is not under heavy loaded, i think this irule with 300 lines in data group would be pretty fine.

iRules Optimization 101 - 05 - Evaluating iRule Performance by Deb Allen