Deploy to Cluster

Concept to deploy to a cluster:

Write Kubernetes config files (YAML)
Tell Kubernetes:
- What image to run
- How many containers
- How traffic flows
Kubernetes:
- Creates containers
- Distributes them across nodes
- Keeps them running

Spring Boot Code
    ↓
Maven build (JAR)
    ↓
Docker Image
    ↓
Kubernetes Deployment
    ↓
Service (Expose it)

From docker-compose.yml to Kubernetes:

1 compose service ≠ 1 YAML file
1 compose service = 2–4 Kubernetes resources

If docker-compose.yml contains:

Category	Services
Core app	`backend`
Datastore	`postgres`, `redis`
Messaging	`zookeeper`, `kafka`
Dev tools	`pgadmin`, `mailhog`, `kafka-ui`
Observability	`prometheus`, `grafana`

To map in Kurbernetes, need these:

Namespace
├── backend: Deployment + Service
├── postgres: Stateful Deployment + PVC + Service
├── redis: Deployment + Service
├── kafka + zookeeper (Stateful-ish)
├── prometheus: Deployment + PVC + Service + Configmap (prometheus.yml)
├── grafana: Deployment + PVC + Service + ConfigMap (datasource.yml)
├── ConfigMaps
├── Secrets