Master-replica architecture in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a Redis instance as a replica of a master.

Redis

replicaof [1] [2]

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

A192.168.1.100 6380

B127.0.0.1 6379

Clocalhost 6379

Dmaster 6379

Attempts:

3 left

💡 Hint

Common Mistakes

Using an incorrect hostname or port.

Omitting the port number.

The replicaof command requires the master host and port. Here, localhost 6379 correctly points to the master Redis instance.

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'

Astatus

Bmaster

Creplica

Drole

Attempts:

3 left

💡 Hint

Common Mistakes

Using master or replica directly instead of the key.

Using unrelated keys like status.

The info replication command shows replication info. Filtering by role shows if the instance is 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 'no_one' which are invalid.

The correct command to promote a replica to master is replicaof no one with a space between 'no' and 'one'.

4fill in blank

hard

Fill both blanks to configure a replica to follow a master at IP 10.0.0.5 and port 6380.

Redis

replicaof [1] [2]

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

A10.0.0.5

B6380

C6379

Dlocalhost

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping IP and port positions.

Using default port 6379 instead of 6380.

The replicaof command needs the master's IP and port. Here, the IP is 10.0.0.5 and the port is 6380.

5fill in blank

hard

Fill all three blanks to create a Redis configuration snippet that sets a replica to follow master at 192.168.0.10 port 6379 and disables replica read-only mode.

Redis

replicaof [1] [2]
replica-read-only [3]

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

A192.168.0.10

B6379

Cno

Dyes

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'yes' for replica-read-only which keeps replica read-only.

Mixing up IP and port order.

The replicaof command sets the master IP and port. Setting replica-read-only no allows writes on the replica.