Monitoring with Sentinel in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to start a Redis Sentinel instance using the configuration file.

Redis

redis-sentinel [1]

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Amaster.conf

Bredis.conf

Csentinel.conf

Dnode.conf

Attempts:

3 left

💡 Hint

Common Mistakes

Using the Redis server config file instead of the Sentinel config file.

Omitting the configuration file argument.

The Redis Sentinel process is started by specifying the sentinel configuration file, usually named sentinel.conf.

2fill in blank

medium

Complete the Sentinel configuration line to monitor a master named 'mymaster' on port 6379 with quorum 2.

Redis

sentinel monitor mymaster 127.0.0.1 [1] 2

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A6379

B6380

C26379

D6378

Attempts:

3 left

💡 Hint

Common Mistakes

Using the Sentinel port (26379) instead of the master port.

Using a random port number.

The default Redis master port is 6379, which Sentinel monitors.

3fill in blank

hard

Fix the error in the Sentinel command to set the failover timeout to 15000 milliseconds.

Redis

sentinel [1] mymaster 15000

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Afailover-timeout

BfailoverTimeout

Cfailover-timeout-ms

Dfailover_timeout

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores instead of hyphens.

Using camelCase which is invalid in Sentinel config.

The correct Sentinel configuration directive uses hyphens: failover-timeout.

4fill in blank

hard

Fill both blanks to configure Sentinel to notify a script and set the client reconfiguration timeout.

Redis

sentinel notification-script mymaster [1]
sentinel client-reconfig-script mymaster [2]

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A/usr/local/bin/notify.sh

B/usr/local/bin/reconfig.sh

C/etc/redis/notify.sh

D/etc/redis/reconfig.sh

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same script path for both directives.

Using non-executable or incorrect script paths.

The notification script and client reconfiguration script paths are set separately. Here, /usr/local/bin/notify.sh is for notifications, and /usr/local/bin/reconfig.sh is for client reconfiguration.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each Sentinel master name to its quorum if the quorum is greater than 1.

Redis

masters_quorum = [1]: [2] for [3], quorum in sentinel_masters.items() if quorum > 1

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

Aname

Bquorum

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names for keys and loop variables.

Using the wrong variable for the value.

This comprehension creates a dictionary where each key is the master name and the value is its quorum, but only for quorums greater than 1.