Failover manual process in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Redis

redis-cli [1]

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

AINFO replication

BPING

CSET key value

DGET key

Attempts:

3 left

💡 Hint

Common Mistakes

Using PING does not show role information.

GET or SET commands do not provide replication info.

The INFO replication command shows the role of the Redis instance (master or slave) and replication info.

2fill in blank

medium

Complete the command to promote a slave to master by making it writable.

Redis

redis-cli [1]

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

ACONFIG SET slave-read-only no

BCONFIG SET slave-read-only yes

CSLAVEOF no one

DSLAVEOF master 6379

Attempts:

3 left

💡 Hint

Common Mistakes

Using SLAVEOF with a master address keeps the instance as a slave.

CONFIG SET slave-read-only no only changes read-only mode but does not promote.

The command SLAVEOF no one promotes the slave to master by stopping replication.

3fill in blank

hard

Fix the error in the command to make the current master a slave of the new master at 192.168.1.10 port 6379.

Redis

redis-cli [1] 192.168.1.10 6379

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

ASLAVE

BSLAVEOF

CMASTEROF

DREPLICAOF

Attempts:

3 left

💡 Hint

Common Mistakes

Using SLAVE or MASTEROF commands which do not exist.

Using REPLICAOF in older Redis versions.

The correct command to make a Redis instance a slave is SLAVEOF followed by the master IP and port.

4fill in blank

hard

Fill both blanks to check the replication offset and connected slaves count.

Redis

redis-cli [1] | grep [2]

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

AINFO replication

BINFO server

Cconnected_slaves

Drole

Attempts:

3 left

💡 Hint

Common Mistakes

Using INFO server does not show replication details.

Filtering by role does not show slave count.

The INFO replication command shows replication stats, and connected_slaves filters the count of connected slaves.

5fill in blank

hard

Fill all three blanks to reset the old master as a slave of the new master at 10.0.0.5 port 6380 and make it read-only.

Redis

redis-cli [1] 10.0.0.5 [2] && redis-cli [3] slave-read-only yes

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

ASLAVEOF

B6380

CCONFIG SET

Attempts:

3 left

💡 Hint

Common Mistakes

Using SLAVEOF instead of SLAVEOF.

Forgetting to set slave-read-only to yes.

First, use SLAVEOF 10.0.0.5 6380 to make the old master a slave. Then use CONFIG SET slave-read-only yes to make it read-only.