This script migrates redis keys namespaces

redis_keys_migration

require 'redis'
 
module RedisMigrator
 
  def self.run
    from = "production:"
    to = "development:"
 
    start = Time.now
 
    r = Redis.new
    k = 0
    keys = r.keys("#{from}*")
 
    puts "Start migrating #{keys.size}..."
 
    keys.each do |key|
      s_key = key.sub(from, to)
      r.rename(key, s_key)
      k += 1
      puts "#{k} keys renamed..." if (k % 100) == 0
    end
 
    puts "Migrated #{k} keys from '#{from}' to '#{to}'... "
    puts "Took #{Time.now - start}s"
  end
 
  def self.run_clean_keys_from
    from = "launch:"
 
    start = Time.now
 
    r = Redis.new
    k = 0
    keys = r.keys("#{from}*")
 
    puts "Start deleting #{keys.size}..."
 
    keys.each do |key|
      r.del key
      k += 1
      puts "#{k} keys deleted..." if (k % 100) == 0
    end
 
    puts "Deleteted #{k} keys from '#{from}... "
    puts "Took #{Time.now - start}s"
  end
end

move key to db 2 after renaming...

require 'redis'

module RedisMigrator

  def self.run
    from = "production:"
    to = "development:"

    start = Time.now

    r = Redis.new
    k = 0
    keys = r.keys("#{from}*")

    puts "Start migrating #{keys.size}..."

    keys.each do |key|
      s_key = key.sub(from, to)
      r.rename(key, s_key)
      r.move s_key, 2
      k += 1
      puts "#{k} keys renamed..." if (k % 100) == 0
    end

    puts "Migrated #{k} keys from '#{from}' to '#{to}'... "
    puts "Took #{Time.now - start}s"
  end

  def self.run_clean_keys_from
    from = "launch:"

    start = Time.now

    r = Redis.new
    k = 0
    keys = r.keys("#{from}*")

    puts "Start deleting #{keys.size}..."

    keys.each do |key|
      r.del key
      k += 1
      puts "#{k} keys deleted..." if (k % 100) == 0
    end

    puts "Deleteted #{k} keys from '#{from}... "
    puts "Took #{Time.now - start}s"
  end
end

Por que isso não é uma rake?

Concordando com @agravem