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2026! A Practical Guide to Redis for Backend Developers: From Basics to Real-World Patterns

Many backend developers use Redis, but in reality, they often use it merely as a simple cache server. There are many cases where developers know the Redis data types but don't know how to apply them in practice, lack experience implementing real-world patterns like distributed locks or rate limiting, or fail to understand Redis from a backend architecture perspective. I also had the experience of pondering how to utilize Redis in a high-traffic environment while developing actual services. This is because knowing simple commands is entirely different from solving service problems with Redis. This course starts with the basic concepts and data structures of Redis and progresses through learning by implementing core patterns used in actual backend services step-by-step. In particular, you will learn how to solve the following practical problems using Redis: Caching (Cache-Aside) strategies to reduce server load, Distributed Sessions (Session Store) to share login states, Distributed Locks to solve concurrency issues, Rate Limiting to prevent API overload, and Real-time Ranking Systems (Leaderboards) for large-scale users. All hands-on exercises are conducted in a real API server environment based on Python FastAPI. Rather than just learning simple CLI commands, you will understand how Redis is used in backend systems by implementing it yourself. Through this course, you will be able to utilize Redis not just as a simple cache, but as a core tool for designing backend architecture.

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Edited

Precautions when testing in a public IP environment

Hello, students! 😊

If your test environment is a computer accessible from the outside (such as a public IP), please refer to the following information to run Redis safely.

Basic execution command.

docker run --name my-redis -p 6379:6379 -d redis

The above setting is a dangerous configuration where Redis can be exposed to the external internet in a public IP environment.

👉In this case, please make sure to run it as follows. (Recommended)⭐⭐⭐

docker run -d --name my-redis -p 127.0.0.1:6379:6379 redis

127.0.0.1 → Block external access (Most important)

👉 If you want to further enhance security, you can set a password as shown below. (Optional)

docker run -d --name my-redis -p 127.0.0.1:6379:6379 redis redis-server --requirepass "password"

requirepass → Prevents unauthorized access (password setup)
- requirepass is not a mandatory setting, and you may omit it in a test environment.
- However, you can set it if you want to further enhance security, in which case you must use the password for all subsequent Redis CLI and code practices.

⚠ How to connect after setting a password

If you used the requirepass option, you must execute the following command after connecting to the Redis CLI.

127.0.0.1:6379> AUTH password

(Added on 2026.03.19)

Hello, students 😊

If you have set a password for Redis and created the container as guided above, you must enter the configured password when using Redis Insight to establish a connection.

Redis Insight is covered in
'Section 4. [Advanced] Redis In-depth and Latest Trends'
'Redis Stack: A Taste of JSON Storage and High-Speed Search (FullText Search)'.

(Configuration Path) Connect existing database (or Add Redis database) -> Connection settings

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