All 7 Redis with Docker & Kubernetes questions
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How do you run a basic Redis instance using Docker? How do you persist Redis data when running it in a Docker container, so data survives a container restart? What Kubernetes resources are typically needed to properly expose and configure a Redis deployment for other applications within the same cluster to use? What resource requests and limits should you configure for a Redis pod running on Kubernetes, and why does this matter? How would you deploy a highly available Redis Sentinel setup on Kubernetes to provide automatic failover for a primary and replica configuration? What are the tradeoffs between self managing Redis on Kubernetes versus using a Kubernetes Operator specifically built for Redis?
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How do you deploy Redis on Kubernetes using a StatefulSet rather than a regular Deployment, and why is this distinction important?

Intermediate

Answer

A StatefulSet is used instead of a regular Deployment because Redis needs stable network identities and persistent storage tied to each specific pod, ensuring that if a pod restarts, it reconnects to the same underlying storage it was using before, which is essential for maintaining data consistency and correctly functioning replication relationships.
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
spec:
  serviceName: redis
  replicas: 3
  volumeClaimTemplates:
  - metadata:
      name: redis-data
Real-world example A team deploying a Redis Cluster on Kubernetes uses a StatefulSet specifically because each Redis node needs to consistently reconnect to its own dedicated persistent volume, something a regular Deployment does not reliably guarantee.

Common follow-ups: What specific problems would arise from using a regular Deployment instead of a StatefulSet for Redis?;How does a StatefulSet handle pod naming differently than a Deployment?

Clustering;Redis Backup & Disaster Recovery
All 7 Redis with Docker & Kubernetes questions