Puppet users - Jul 2008 - deriving a site variable based on clients primary IP address

I''ve written a custom facter script that works out which class network
range a machine is on (apologies for the rubbish ruby scripting but it
does the job for the time being).

Facter.add("ipaddress_range") do
  setcode do
    %x{facter ipaddress | awk -F"." ''{print
$1"."$2"."$3}''}.chomp
  end
end

I''m then using this to define local resources they should use (eg.
mailhost/DNS/NTP/build, etc...) by the following class.

class util {

# define list of class c networks associated with each site
$sitea_ipaddress_ranges = [ "192.168.1", "192.168.2",
"192.168.3" ]
$siteb_ipaddress_ranges = [ "192.168.4", "192.168.5",
"192.168.6" ]

# work out location based on ipaddress_range fact and list of networks
above
case $ipaddress_range {
        $sitea_ipaddress_ranges :   { $location = "sitea" }
        $siteb_ipaddress_ranges:    { $location = "siteb" }
        default :                                { $location "sitea" }
}

# work out build server and location of yum repos based on location
$buildserver = $location ? {
        ''sitea''             => "build0",
        ''siteb''             => "build1",
        default            => "build0" }
}

I think my syntax for the case statement is wrong - I''ve used a
variable because there are potentially numerous address ranges and its
easier just to have a couple of long lists rather than continually
adding to the case statement. Any suggestions greatfully appreciated!

Rgds,

Henry
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Henry wrote:
> I''ve written a custom facter script that works out which class
network
> range a machine is on (apologies for the rubbish ruby scripting but it
> does the job for the time being).
> 
> Facter.add("ipaddress_range") do
>   setcode do
>     %x{facter ipaddress | awk -F"." ''{print
$1"."$2"."$3}''}.chomp
>   end
> end
I would advise against hard coding such an expectation of an IP address 
being part of a /24.

I personally had to do something similar but instead designed a SQL back 
end which had a table listing various machine/app types. It was super 
trivial at that point to map their relationships to a puppet node manifest.

This gives you complete dynamicity (??WTF??) of machines regardless of 
their state or network location.

-scott

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On 7/17/2008 11:54 AM, Scott Smith wrote:
> I personally had to do something similar but instead designed a SQL back 
> end which had a table listing various machine/app types. It was super 
> trivial at that point to map their relationships to a puppet node manifest.
One could possibly adapt 
http://reductivelabs.com/trac/puppet/wiki/Recipes/HostgroupFact , as well.

-- 
Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
931 372-3601 / Tennessee Technological University

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