Prune old clients.

gistfile1.rb

#!/usr/bin/env ruby

require 'set'

def knife_list(type)
  Set.new(`knife #{type} list`.split("\n").map { |a| a.strip.chomp })
end

nodes   = knife_list(:node)
clients = knife_list(:client)

# We want to remove the clients that aren't nodes.
bad_clients = clients - nodes
bad_clients = bad_clients.to_a.sort

puts "Deleting #{bad_clients.length} stale clients."
bad_clients.each_index do |index|
  bad_client = bad_clients[index]

  puts "Deleting client #{index + 1}/#{bad_clients.length}: #{bad_client}"
  `knife client delete #{bad_client} -y`
end