Or, if you really, really need to use the array ref...

#! /usr/bin/perl -w

# Start using this, and warnings (above -w)  :)
use strict;


my $node_number = [1,2,3,4,5];


# Your variable above is a reference to an array
# Instead of while, use an iterator like foreach
# Note: must dererence with @$
# Each time through the loop the current value is in $_
foreach (@$node_number) {
   print <<EOF;

node = $_
ccu = 5
ccu2 = 9
tacaf = y
enable = y
sync = 8

EOF
}
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