[Puppet Users] override parametrized classes

[Felice Pizzurro]

Hi all,

In my datacenter I've a configuration like this:

class apache2 ($max_fork=100, $monitor=true) {
    # some implementation that utilize $max_fork and $monitor
variables
}

class mysql ($max_conn=200, $monitor=true) {
    # some implementation that utilize $max_conn and $monitor
variables
}

class php ($max_execution_time=10){
    # some implementation that utilize $max_execution_time variable
}

class webserver ($max_fork=100,$max_execution_time=10, $monitor=true)
{
    class { 'apache2' :
        max_fork => $max_fork,
        monitor => $monitor
    }

    class { 'php' :
        max_execution_time => $max_execution_time
    }
}

class db ($max_conn=200, $monitor=true) {
    class { 'mysql' :
        max_conn => $max_conn,
        monitor => $monitor
    }
}

class completeserver ($max_fork, $max_execution_time, $max_conn,
$monitor) {
    class { 'webserver' :
        max_fork => $max_fork,
        max_execution_time => $max_execution_time,
        monitor => $monitor
    }
    class { 'db' :
        max_conn => $max_conn,
        monitor => $monitor
    }
}

node example {
    $max_fork=200
    $max_execution_time=30
    $max_conn=500
    $monitor=false

    class { 'completeserver':
        max_fork => $max_fork,
        max_conn => $max_conn,
        max_execution_time => $max_execution_time,
        monitor => $monitor
    }
}


This configuration works fine and allows me to override all parameters
in classes apache2, mysql, php directly on the node definition.
The problem is that I have to report any parameter present in every
base class through every classes that includes it. The result is that
completeserver class has all defined parameters and if I need to add
another parameter, for example, in apache2 class, I have to add this
parameter also in webserver class and completeserver class and this is
not so useful.
Has someone solved the same problem in a more elegant way?

Thanks in advance,
Fx

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