Authentication with requirepass in Redis - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ query_result

intermediate

What happens when you try to run a command without AUTH after setting requirepass?

Assume Redis is configured with requirepass mysecret. What is the output of running GET key1 without authenticating first?

Redis

GET key1

A Error: NOAUTH Authentication required.

B key1's value

C nil

D OK

💡 Hint

Think about what Redis requires before allowing commands when requirepass is set.

When requirepass is set, Redis blocks all commands except AUTH until the client authenticates. So running GET without AUTH returns an error.

❓ query_result

intermediate

What is the output of AUTH with wrong password?

If Redis is configured with requirepass mysecret, what is the output of AUTH wrongpass?

Redis

AUTH wrongpass

A +OK

B -ERR invalid password

C -ERR wrong number of arguments for 'auth' command

D -ERR Authentication required.

💡 Hint

What does Redis reply when the password is incorrect?

Redis replies with an error message indicating the password is invalid when AUTH is called with a wrong password.

📝 Syntax

advanced

Which AUTH command syntax is correct to authenticate with password 'mypassword'?

Choose the correct Redis AUTH command syntax to authenticate with password 'mypassword'.

A AUTH mypassword

B AUTH password='mypassword'

C AUTH 'mypassword'

D AUTH password mypassword

💡 Hint

AUTH command takes the password as a single argument without quotes or keywords.

The AUTH command syntax is AUTH without quotes or keywords.

🧠 Conceptual

advanced

Why is setting requirepass important in Redis?

Select the best reason why setting requirepass in Redis configuration is important.

A It compresses Redis data to save memory.

B It encrypts all data stored in Redis automatically.

C It requires clients to authenticate before running commands, protecting data.

D It enables Redis to run on multiple CPUs.

💡 Hint

Think about what security feature requirepass provides.

requirepass forces clients to authenticate before executing commands, preventing unauthorized access.

🔧 Debug

expert

Why does this Redis client fail to authenticate?

A Redis client runs these commands: 1. SET key1 value1 2. AUTH mysecret 3. GET key1 Redis is configured with requirepass mysecret. The client gets an error on the SET command. Why?

Redis

SET key1 value1
AUTH mysecret
GET key1

A Redis does not support AUTH command.

B The password 'mysecret' is incorrect.

C GET command must come before AUTH.

D The client must authenticate before running any commands, so SET fails because it runs before AUTH.

💡 Hint

Consider the order of commands and when authentication is required.

When requirepass is set, Redis blocks all commands except AUTH until the client authenticates. Running SET before AUTH causes an error.