Explain Kubernetes core concepts — Pods, Deployments, and Services

Question

"We're moving from Docker Compose to K8s. Explain the core resources."

Interview OS Community · Accepted Answer

## Hierarchy
Deployment → ReplicaSet → Pod(s) → Container(s), Service → routes to Pod(s)

## Deployment (manages Pods)
```yaml
apiVersion: apps/v1
kind: Deployment
spec:
  replicas: 3
  selector: { matchLabels: { app: interviewos } }
  template:
    spec:
      containers: [{ name: web, image: interviewos:latest, ports: [{ containerPort: 3000 }] }]
```

## Service (networking)
```yaml
kind: Service
spec:
  selector: { app: interviewos }
  type: LoadBalancer
  ports: [{ port: 80, targetPort: 3000 }]
```

| Resource | Purpose |
|----------|---------|
| Pod | Runs containers |
| Deployment | Manages replicas, updates, rollbacks |
| Service | Stable IP, load balancing |
| ConfigMap | Configuration |
| Secret | Sensitive data |

Interview OS

Explain Kubernetes core concepts — Pods, Deployments, and Services

Question Details

Suggested Solution

Hierarchy

Deployment (manages Pods)

Service (networking)

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