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.
210 learners
Level Beginner
Course period Unlimited
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Edited
Please refer to this if you have set a password for Redis (removing the password is recommended)
Hello, students! 😊
I recently posted a notice regarding 'Precautions when testing in a public IP environment'.
That content was a guide on IP binding and password settings when creating a Redis container, specifically for cases where the test environment is a computer accessible from the outside (such as a public IP).
However, even in a public IP environment, 127.0.0.1if you have restricted the IP to this, you do not necessarily need to set a password.
If you set a password, you will need to authenticate continuously throughout the subsequent practice sessions, which may cause inconvenience to the learning flow.
If you have set a password, we recommend deleting the existing container if possible and recreating it (by specifying only the IP) as shown below.
docker rm -f my-redis
docker run -d --name my-redis -p 127.0.0.1:6379:6379 redis
We apologize for any inconvenience caused to your learning experience.
Below is a guide on where a password is required for each lecture practice if you continue to use one.
21. Redis Stack: A Taste of JSON Storage and High-Speed Search (FullText Search)
You must enter a password when loading Redis into Redis Insight.
24. Transactions and Scripting: Lua Script and Redis Functions
Specifying a password in the Redis Functions load command
# If a password is set for Redis docker exec -i my-redis redis-cli -a <password> -x FUNCTION LOAD REPLACE < coupon_logic.lua
The entirety of Section 5. [Pattern] Implementing Practical Backend Application Patterns (with FastAPI)
Specify the account (default) and password in all code that creates a Redis connection pool in FastAPI.
@asynccontextmanager async def lifespan(app: FastAPI): app.state.redis = redis.from_url("redis://localhost:6379/0", decode_responses=True) # If a password is set for Redis # app.state.redis = redis.from_url("redis://default:<password>@localhost:6379/0", decode_responses=True) print("✅ Redis connection successful!") yield await app.state.redis.aclose() print("❌ Redis connection closed!")