Multiple Sentinel instances in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a Redis Sentinel instance monitoring the master named 'mymaster'.

Redis

sentinel monitor [1] 127.0.0.1 6379 2

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

Aredis-master

Bmaster1

Cmymaster

Dprimary

Attempts:

3 left

💡 Hint

Common Mistakes

Using an incorrect master name causes Sentinel not to monitor the right instance.

The sentinel monitor command requires the master name as the first argument. 'mymaster' is the default example name.

2fill in blank

medium

Complete the code to configure the quorum for failover to 3 Sentinel instances.

Redis

sentinel set [1] quorum 3

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

Afailover

Bmymaster

Cquorum

Dmonitor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'quorum' or 'failover' as the master name causes configuration errors.

The quorum setting is applied to the master name monitored by Sentinel, here 'mymaster'.

3fill in blank

hard

Fix the error in the command to add a new Sentinel instance to monitor the master 'mymaster'.

Redis

sentinel monitor [1] 127.0.0.1 6379 2

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

Amymaster

Bmymaster 2

Cmymaster 1

Dmymaster 3

Attempts:

3 left

💡 Hint

Common Mistakes

Appending the quorum number to the master name causes syntax errors.

The sentinel monitor command requires exactly 4 arguments: master name, IP, port, and quorum. The quorum number is missing in the code, so the correct fix is to provide the master name only and add the quorum number after.

4fill in blank

hard

Fill both blanks to configure the failover timeout and parallel sync for 'mymaster'.

Redis

sentinel set [1] failover-timeout [2]

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

Amymaster

B5000

C10000

Dparallel-syncs

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'parallel-syncs' as a timeout value causes errors.

Using the wrong master name causes configuration to fail.

The first blank is the master name 'mymaster'. The second blank is the failover timeout value in milliseconds, here '10000' (10 seconds).

5fill in blank

hard

Fill all three blanks to create a dictionary of Sentinel instances with their IPs and ports.

Redis

sentinels = [1]: [2], [3]: 26379, '192.168.1.11': 26380}

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

A'192.168.1.10'

B26379

D26378

Attempts:

3 left

💡 Hint

Common Mistakes

Using integers as keys instead of strings.

Mixing up port numbers for different IPs.

The dictionary keys are IP addresses as strings, and values are port numbers. The first key is '192.168.1.10', the first value is 26378, and the second key is '192.168.1.10' (should be corrected to '192.168.1.11' in code), the second value is 26379.