By default, Redis does not authenticate users based on usernames. It relies solely on a single 'password' for server access, referred to as the 'requirepass' password.
Starting from Redis 6.0, Access Control Lists (ACL) were introduced for role-based access control, enabling finer-grained permission management using usernames and passwords. In this system, distinct permissions can be assigned to various users, each with their own username and password. This allows controlling access to specific commands or data for users.
For example, consider a team where only certain members need access to sensitive data on the Redis server; you can define different user roles and grant them specific access permissions. For instance, administrators might be granted full unrestricted access, while other users are subject to stricter limitations.
This ACL-based system enhances security, allowing Redis to be deployed in scenarios requiring fine-grained authentication and permission management.