Dynamic Ip Whitelisting using redis or a database

hello everyone,

i am looking for a solution to dynamically ip whitelist client that we have .
i have seen the solution that NGINX provide with the key-val store but for now we don't have money to spare on it, i am looking for an alternative.
is there a a way to implement a whitelisting solution using redis or any other database system ?

Thanks for you help
Eitan