Puppet Tips&Tricks: Variable variables

Sometimes you want to use variable variables, for instance when you want to iterate over all the ipaddress_* facts that facter found. Using something like ${ipaddress_$if} doesn’t work, though. Inline_template to the rescue! Volcane on IRC suggested the following solution, which works great:

$ifs = split($interfaces,",")

define do_this { $mule = "ipaddress_${name}" $donkey = inline_template("<%= scope.lookupvar(mule) %>")

notify { "Found interface $donkey":; }

}

do_this { $ifs:; }

This will output:

$ sudo puppet net.pp

notice: Found interface 172.29.121.22

notice: //Do_this[eth0]/Notify[Found interface 172.29.121.22]/message: defined 'message' as 'Found interface 172.29.121.22'

notice: Found interface 213.207.83.56

notice: //Do_this[eth1]/Notify[Found interface 213.207.83.56]/message: defined 'message' as 'Found interface 213.207.83.56'

Hope this helps someone else! Leave a message if it does.

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