Why replication provides redundancy in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set up a Redis replica.

Redis

replicaof [1] 6379

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

A0.0.0.0

Blocalhost

C192.168.1.100

D127.0.0.1

Attempts:

3 left

💡 Hint

Common Mistakes

Using an incorrect IP address that does not point to the master.

Using 'localhost' instead of '127.0.0.1' in some Redis configurations.

The replicaof command tells Redis to replicate data from the master at the given IP address. Using 127.0.0.1 means the replica connects to the master on the same machine.

2fill in blank

medium

Complete the command to check the role of a Redis instance.

Redis

info replication | grep [1]

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

Aslave

Bmaster

Crole

Dconnected

Attempts:

3 left

💡 Hint

Common Mistakes

Searching for 'master' or 'slave' directly instead of 'role'.

Using incorrect grep patterns that return no results.

The info replication command shows replication info. Filtering by role shows if the instance is a master or replica.

3fill in blank

hard

Fix the error in the command to promote a replica to master.

Redis

redis-cli [1]

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

Areplicaof noone

Breplicaof no one

Creplicaof none

Dreplicaof no_one

Attempts:

3 left

💡 Hint

Common Mistakes

Writing 'noone' as one word.

Using 'none' or underscores instead of spaces.

The correct command to promote a replica to master is replicaof no one with spaces.

4fill in blank

hard

Fill both blanks to complete the Redis configuration for replication.

Redis

replicaof [1] [2]

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

A192.168.0.10

B6379

C6380

Dlocalhost

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping IP and port positions.

Using wrong port numbers.

The replicaof command requires the master's IP and port. Here, 192.168.0.10 is the master IP and 6379 is the default Redis port.

5fill in blank

hard

Fill all three blanks to create a Redis command that sets a key with replication enabled.

Redis

redis-cli -h [1] -p [2] set [3] "value"

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

A127.0.0.1

B6379

Cmykey

Dlocalhost

Attempts:

3 left

💡 Hint

Common Mistakes

Using IP instead of hostname inconsistently.

Forgetting to specify the key name.

This command connects to Redis at localhost on port 6379 and sets the key mykey with the value "value". Replication will propagate this change to replicas.