Why Sentinel provides high availability in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check the Sentinel status command.

Redis

redis-cli [1]

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

ASENTINEL slaves mymaster

BSENTINEL masters

CSENTINEL get-master-addr-by-name mymaster

DPING

Attempts:

3 left

💡 Hint

Common Mistakes

Using PING instead of SENTINEL command

Using slaves command when asked for status

The SENTINEL masters command lists all monitored masters, showing Sentinel's view of the cluster status.

2fill in blank

medium

Complete the code to failover a master using Sentinel.

Redis

redis-cli [1] mymaster

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

ASENTINEL failover

BSENTINEL slaves

CSENTINEL reset

DSENTINEL monitor

Attempts:

3 left

💡 Hint

Common Mistakes

Using monitor instead of failover

Using reset which clears state

The SENTINEL failover mymaster command forces Sentinel to start a failover for the master named 'mymaster'.

3fill in blank

hard

Fix the error in the command to get the master address.

Redis

redis-cli SENTINEL [1] mymaster

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Aget-master-addr

Bget-master-name-by-addr

Cget-slave-addr-by-name

Dget-master-addr-by-name

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong command names

Confusing slave and master commands

The correct command is get-master-addr-by-name to get the IP and port of the master.

4fill in blank

hard

Fill both blanks to create a Sentinel configuration command.

Redis

SENTINEL [1] mymaster [2] 6379

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

Amonitor

Bport

C127.0.0.1

Dfailover

Attempts:

3 left

💡 Hint

Common Mistakes

Using failover instead of monitor

Using port instead of IP address

The command SENTINEL monitor mymaster 127.0.0.1 6379 tells Sentinel to monitor the master at IP 127.0.0.1 and port 6379.

5fill in blank

hard

Fill both blanks to create a command that resets Sentinel state for a master.

Redis

SENTINEL [1] [2]

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

Areset

Bmymaster

Dfailover

Attempts:

3 left

💡 Hint

Common Mistakes

Using failover instead of reset

The command SENTINEL reset mymaster resets Sentinel's state for the master named 'mymaster'.