Authentication with requirepass in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to authenticate with Redis using the password.

Redis

AUTH [1]

Drag options to blanks, or click blank then click option'

Amypassword

Bpassword123

C123456

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong password string.

Omitting the AUTH command before the password.

The AUTH command requires the correct password to authenticate the client. Here, 'password123' is the password set in requirepass.

2fill in blank

medium

Complete the code to set the requirepass in the Redis configuration file.

Redis

requirepass [1]

Drag options to blanks, or click blank then click option'

Apassword123

Bletmein

Credispass

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using an empty password.

Not restarting Redis after changing the config.

The requirepass directive in redis.conf sets the password clients must use to authenticate. 'password123' is the example password here.

3fill in blank

hard

Fix the error in the command to authenticate with Redis.

Redis

AUTH [1]

Drag options to blanks, or click blank then click option'

Aauth password123

BAUTH password123

Cpassword123

Dpassword

Attempts:

3 left

💡 Hint

Common Mistakes

Repeating the AUTH keyword.

Including extra text in the blank.

The AUTH command must be followed by the password only. Including 'AUTH' twice or extra text like 'auth password123' causes errors.

4fill in blank

hard

Fill both blanks to authenticate and then set a key in Redis.

Redis

AUTH [1]
SET mykey [2]

Drag options to blanks, or click blank then click option'

Apassword123

Bhello

Cworld

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong password in AUTH.

Setting the key to an incorrect value.

First, authenticate with the correct password 'password123'. Then set the key 'mykey' to the value 'world'.

5fill in blank

hard

Fill all three blanks to authenticate, set a key, and retrieve it.

Redis

AUTH [1]
SET [2] [3]
GET mykey

Drag options to blanks, or click blank then click option'

Apassword123

Bmykey

Chello

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using different key names in SET and GET.

Incorrect password in AUTH.

Authenticate with 'password123', set the key 'mykey' to 'hello', then retrieve it with GET.

Practice

1. What does the requirepass directive do in Redis?

easy

A. It sets a password that clients must use to authenticate before accessing Redis.

B. It disables all client connections to Redis.

C. It automatically encrypts all data stored in Redis.

D. It sets the maximum number of clients allowed to connect.

Solution

1. Step 1: Understand the purpose of requirepass

   The requirepass directive is used to protect Redis by requiring clients to authenticate with a password.

2. Step 2: Compare options with this purpose

   Only It sets a password that clients must use to authenticate before accessing Redis. describes setting a password for client authentication, matching the purpose of requirepass.

3. Final Answer:

   It sets a password that clients must use to authenticate before accessing Redis. -> Option A

4. Quick Check:

   requirepass = password protection [OK]

Hint: requirepass means password required to connect [OK]

Common Mistakes:

• Thinking requirepass disables connections
• Confusing requirepass with encryption
• Assuming requirepass limits client count

2. Which of the following is the correct way to authenticate a Redis client after requirepass is set?

easy

A. AUTH mypassword

B. LOGIN mypassword

C. CONNECT mypassword

D. PASSWORD mypassword

Solution

1. Step 1: Identify the Redis command for authentication

   Redis uses the AUTH command followed by the password to authenticate clients.

2. Step 2: Check the options for the AUTH command

   Only AUTH mypassword uses the correct AUTH command syntax.

3. Final Answer:

   AUTH mypassword -> Option A

4. Quick Check:

   AUTH command = authenticate password [OK]

Hint: Use AUTH command to send password [OK]

Common Mistakes:

• Using LOGIN instead of AUTH
• Using CONNECT or PASSWORD commands which don't exist
• Forgetting to include the password after AUTH

3. Given the Redis configuration has requirepass foobar set, what will be the output of the following commands sequence?

SET key1 value1
GET key1
AUTH foobar
GET key1

medium

A. OK
(error) NOAUTH Authentication required.
OK
"value1"

B. OK
"value1"
OK
"value1"

C. OK
(error) NOAUTH Authentication required.
(error) NOAUTH Authentication required.
"value1"

D. (error) NOAUTH Authentication required.
(error) NOAUTH Authentication required.
OK
(nil)

Solution

1. Step 1: Understand requirepass effect on commands

   When requirepass is set, all commands except AUTH fail with NOAUTH error until the client authenticates.

2. Step 2: Analyze command sequence

   SET key1 value1 fails with NOAUTH (unauthenticated). GET key1 fails with NOAUTH. AUTH foobar succeeds (OK). GET key1 returns (nil) because the key was never successfully set.

3. Final Answer:

   (error) NOAUTH Authentication required. (error) NOAUTH Authentication required. OK (nil) -> Option D

4. Quick Check:

   Pre-AUTH: NOAUTH errors; post-AUTH: (nil) since key unset [OK]

Hint: Non-AUTH commands fail with NOAUTH before successful AUTH [OK]

Common Mistakes:

• Assuming commands work before AUTH
• Thinking AUTH returns error
• Confusing order of outputs

4. You set requirepass mysecret in your Redis config. A client tries to run AUTH wrongpass followed by GET key. What is the problem and how to fix it?

medium

A. The client must restart Redis; fix by restarting server.

B. The client used wrong password; fix by using correct password with AUTH.

C. requirepass disables GET command; fix by removing requirepass.

D. The client must run AUTH after GET; fix by swapping commands.

Solution

1. Step 1: Identify the error cause

   Using a wrong password with AUTH means client is not authenticated, so GET command will fail with NOAUTH error.

2. Step 2: Correct the authentication process

   Client must provide the correct password with AUTH to authenticate and access commands like GET.

3. Final Answer:

   The client used wrong password; fix by using correct password with AUTH. -> Option B

4. Quick Check:

   Wrong password = no access; correct password fixes it [OK]

Hint: AUTH password must match requirepass exactly [OK]

Common Mistakes:

• Trying commands before successful AUTH
• Thinking requirepass disables commands permanently
• Restarting server unnecessarily

5. You want to change the Redis password without restarting the server. Which command should you use to set a new password newpass123 dynamically?

hard

A. AUTH newpass123

B. SET requirepass newpass123

C. CONFIG SET requirepass newpass123

D. CONFIG GET requirepass

Solution

1. Step 1: Understand how to change requirepass dynamically

   Redis allows changing configuration parameters at runtime using CONFIG SET command.

2. Step 2: Identify correct command to change password

   To change the password, use CONFIG SET requirepass newpass123. AUTH is for client login, SET is for keys, CONFIG GET only reads.

3. Final Answer:

   CONFIG SET requirepass newpass123 -> Option C

4. Quick Check:

   CONFIG SET changes config without restart [OK]

Hint: Use CONFIG SET requirepass to change password live [OK]

Common Mistakes:

• Using AUTH to change password
• Trying SET command for config
• Using CONFIG GET which only reads