ruby hack to copy a subset of redis keys from an old server to a new server

redis-copy-keys-to-server.md

Redis Key Copy

require "redis"

# old redis server with keys we want to copy
old = Redis.new(:url => "redis://:password@url:6379/0")

# new server address
new = Redis.new(:url => "redis://127.0.0.1:6379/0")

# the "name" keys we want to copy from the old server
# could be explicit here. A wild card works for a small set.
name_keys = old.keys("name_*")

name_keys.each do |key|
  old.hgetall("#{key}").each do |k,v|
    aws.hset("#{key}", k, v)
  end
end