Chef port of the swap puppet manifest (https://gist.github.com/andredumas/9612937)

swap.rb

execute "mkswap" do
  command "dd if=/dev/zero of=/var/swapfile bs=1024 count=$((1226*1024)); mkswap /var/swapfile"
  creates "/var/swapfile"
  umask 0077
  action :run
end

mount "none" do 
  action :enable
  device "/var/swapfile"
  fstype "swap"
  options "sw"
end

execute "swapon -a"