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Lerna_Ekmekciog's avatar
Lerna_Ekmekciog
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Aug 11, 2005

which iRules reference this pool

Hello,

 

 

I'm using iControl sdk 9.0. I'm working on a Java program that pushes a given config of a load balancer obtained from a database to the local box.

 

 

Is there a programatically easy way to check which iRules a pool is referenced by? I can see query_rule method but this requires a parse of the rule_definition.

 

 

RuleDefinition[] query_rule(

 

in String[] rule_names

 

);

 

 

where RuleDefinition is a struct with following fields

 

 

rule_name String The rule name.

 

rule_definition String The rule text/definition.

 

 

 

 

 

 

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  • Joe_Pruitt's avatar
    Joe_Pruitt
    Aug 11, 2005
    I think you meant to check which iRules a virtual server is reference by. Pools and Rules are both resources applied to a virtual server.

     

     

    With that being said, there really isn't an easy way to do this search given a rule, to find which virtuals it is associated with. Our API's are defined top-down, meaning that you need to go to a containing object to get information about it's contained members.

     

     

    What you'll have to do is the following:

     

     

    Feed the string array returned from LocalLB::VirtualServer::get_list() into LocalLB::VirtualServer::get_rule().

     

     

    You can then loop through all the rules and when you find a match lookup that associated entry in the virtual list.

     

     

    This is the second question of this sort we've gotten this week - the last one was asking if you could lookup which virtuals a pool belongs to in a single call. The answer there was the same procedure as I described above for rules. I'll create a change request to add this feature in an upcoming release.

     

     

    -Joe
  • Lerna_Ekmekciog's avatar
    Lerna_Ekmekciog
    Icon for Nimbostratus rankNimbostratus
    Aug 11, 2005
    Joe,

     

     

    Thanks for the quick reply. However I was asking a different question than the one you answered. Let me explain better what I mean.

     

     

    Given a pool I want to find out which iRules include a reference to this pool in their definition.

     

     

    For ex:

     

    iRule1's definition is the following:

     

    when CLIENT_ACCEPTED {

     

    pool pool1

     

    }

     

     

    and iRule2's definition is as follows:

     

     

    when HTTP_REQUEST {

     

    if {[HTTP::uri] ends_with "foo"} {

     

    pool pool1

     

    }

     

    }

     

     

    Now given a pool such as pool1 I want to find the list of iRules (that is iRule1 and iRule2) that includes that pool in their definition. Is this possible?

     

     

    Lerna
  • Joe_Pruitt's avatar
    Joe_Pruitt
    Aug 11, 2005
    No problem. Since rules are just stored as text internally and processed at runtime there are now ways to speed up the lookup aside from searching through the text of a rule and searching for the given pool name.

    What makes things a bit more compilcated is when you are using variables for pool names

    when HTTP_REQUEST {
  set pool_to_use "pool1"
  if { [HTTP::uri] ends_with "foo"} {
    pool $pool_to_use
  }

    Customers are doing this when they want to create a pool of pools and dynamically assign connections to that pool based on some external criteria (incoming ip, portion of uri, etc).

    Since this isn't your case, then doing a string search for the string "pool pool1" should work (as long as you don't add extra spaces in between "pool" and "pool1".

    This looks like a great contribution to CodeShare! If you supply it I'd even be inclined to get it in an upcoming SDK!

    -Joe