creating-kubernetes-deployments

# Creating Kubernetes Deployments

Generate production-ready Kubernetes manifests with health checks, resource limits, and security best practices.

## Quick Start

### Basic Deployment + Service

```yaml
# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-api
  labels:
    app: my-api
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-api
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  template:
    metadata:
      labels:
        app: my-api
    spec:
      containers:
      - name: my-api
        image: my-registry/my-api:v1.0.0
        ports:
        - containerPort: 8080
        resources:
          requests:
            cpu: 100m
            memory: 256Mi
          limits:
            cpu: 500m
            memory: 512Mi
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /readyz
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
---
apiVersion: v1
kind: Service
metadata:
  name: my-api
spec:
  type: ClusterIP
  selector:
    app: my-api
  ports:
  - port: 80
    targetPort: 8080
```

## Deployment Strategies

| Strategy | Use Case | Configuration |
|----------|----------|---------------|
| RollingUpdate | Zero-downtime updates | `maxSurge: 25%`, `maxUnavailable: 25%` |
| Recreate | Stateful apps, incompatible versions | `type: Recreate` |
| Blue-Green | Instant rollback | Two deployments, switch Service selector |
| Canary | Gradual rollout | Multiple deployments with weighted traffic |

### Blue-Green Deployment

```yaml
# Blue deployment (current production)
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-api-blue
  labels:
    app: my-api
    version: blue
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-api
      version: blue
  template:
    metadata: