Migrate redis key/values by key match

migrate_redis.rb

require 'redis'

redisSrc = Redis.connect url: "redis://<src>:6379"
redisDest = Redis.connect url: "redis://<dest>:6379"

redisSrc.keys("*").each do |key|
  begin
    data = redisSrc.dump key
    ttl = redisSrc.pttl key # milleseconds
    redisDest.restore key, ttl, data
  rescue => e
    p key, e
  end
end