Redis backup & restore script

backup.rb

def backup(path, redis)
  keys = redis.keys

  puts "#{ keys.size } keys to dump"

  File.open(path, 'w+') do |f|
    keys.each_with_index do |key, i|
      next unless dump = redis.dump(key)

      f.puts JSON.dump([key, dump.force_encoding('utf-8')]).force_encoding('utf-8')

      puts "#{i} / #{ keys.size }" if i % 100 == 0
    end
  end

  puts "Done!"
end

backup(Rails.root.join('tmp/redis.json'), Redis.current)

restore.rb

def load(path, redis)
  File.open(path, 'r') do |f|
    i = 0

    f.each_line do |line|
      i += 1

      key, dump = JSON.load(line.force_encoding('utf-8'))

      redis.restore(key, 0, dump)

      puts i if i % 100 == 0
    end
  end
end

Redis.new(:db => 6).flushdb # Cleaning up the database

load(Rails.root.join('tmp/redis.json'), Redis.new(:db => 6))