All 7 Session Management with Redis questions
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Why is Redis a popular choice for storing web application session data? How would you store more complex session data, such as a user's cart contents alongside their basic login information, using Redis? How do you implement a feature that forcibly logs out a specific user across all of their active sessions and devices? How do you monitor the total number of active sessions currently stored in Redis, and why might this metric be useful? How would you design a session management system that supports both a sliding expiration for active users and an absolute maximum session lifetime regardless of activity? What security considerations are important when storing sensitive session data in Redis, such as authentication tokens?
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How do you extend a user's session expiration time each time they make a new request, keeping active users logged in?

Beginner

Answer

You call the EXPIRE command with a fresh expiration duration each time a user makes a request, effectively resetting their session's countdown timer, ensuring an actively browsing user's session stays alive, while a genuinely inactive user's session will still naturally expire after the configured period of inactivity.
GET session:abc123
EXPIRE session:abc123 1800 -- reset the timer on each request
Real-world example A shopping website extends a customer's session expiration every time they view a new page, ensuring an actively shopping customer is never unexpectedly logged out mid checkout, while inactive sessions still clean up automatically.

Common follow-ups: Should the session expiration be extended on every single request or only certain ones?;What is a reasonable session timeout duration for a typical web application?

Expiration & Eviction;Redis CLI & Basic Commands
All 7 Session Management with Redis questions