Failover manual process in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is failover in Redis?

Failover in Redis means switching from the main server (master) to a backup server (replica) when the main server stops working.

beginner

Why do we need a manual failover process in Redis?

Manual failover is needed when automatic failover does not happen or is disabled. It helps keep the system running by promoting a replica to master by hand.

intermediate

Name the Redis command used to manually promote a replica to master.

The command is CLUSTER FAILOVER when using Redis Cluster or SLAVEOF NO ONE for standalone Redis replicas.

beginner

What is the first step in a manual failover process in Redis?

First, check the health of the current master and replicas to confirm the master is down or unreachable.

intermediate

After promoting a replica to master manually, what should you do next?

Update your application or clients to connect to the new master and reconfigure other replicas to follow the new master.

Which Redis command promotes a replica to master in a standalone setup?

A MASTER REPLICA

B CLUSTER FAILOVER

C FAILOVER START

D SLAVEOF NO ONE

In standalone Redis, SLAVEOF NO ONE promotes a replica to master.

What is the main reason to perform manual failover in Redis?

A To backup data

B Automatic failover failed or is disabled

C To restart Redis server

D To clear cache

Manual failover is done when automatic failover does not work or is turned off.

Before manual failover, what should you verify?

A Master server is down or unreachable

B Replica has more data

C Network speed is fast

D Clients are disconnected

You must confirm the master is not working before failover.

After manual failover, what must be updated?

A Client connections to point to new master

B Redis version

C Disk space

D Firewall rules

Clients need to connect to the new master after failover.

Which Redis feature can automate failover without manual steps?

A Redis Backup

B Redis CLI

C Redis Sentinel

D Redis Cache

Redis Sentinel monitors and automatically performs failover.

Describe the manual failover process in Redis step-by-step.

Think about what you do before, during, and after switching servers.

Explain why manual failover might be necessary even if Redis has automatic failover options.

Consider situations where automation does not work as expected.