cloud-native

## What I do - Design cloud-native architectures using containers and microservices - Implement Kubernetes-based deployments and operations - Build serverless applications and functions - Create event-driven systems with message queues - Design scalable, resilient, and observable systems - Implement GitOps and IaC practices ## When to use me - When building new applications for cloud deployment - When modernizing legacy applications - When implementing microservices architecture - When scaling applications elastically - When adopting Kubernetes or container orchestration - When implementing cloud-native security ## Key Concepts ### Twelve-Factor App Principles 1. **Codebase**: One repo per app, multiple deploys 2. **Dependencies**: Explicitly declare and isolate 3. **Config**: Store config in environment 4. **Backing Services**: Treat as attached resources 5. **Build/Release/Run**: Strict separation 6. **Processes**: Stateless, share nothing 7. **Port Binding**: Export via port binding 8. **Concurrency**: Scale out via processes 9. **Disposability**: Fast startup, graceful shutdown 10. **Dev/Prod Parity**: Keep environments similar 11. **Logs**: Treat as event streams 12. **Admin Processes**: Run admin tasks same as processes ### Kubernetes Deployment ```yaml apiVersion: apps/v1 kind: Deployment metadata: name: myapp labels: app: myapp spec: replicas: 3 selector: matchLabels: app: myapp template: metadata: labels: app: myapp spec: containers: - name: myapp image: myapp:latest ports: - containerPort: 8080 resources: requests: memory: "128Mi" cpu: "250m" limits: memory: "256Mi" cpu: "500m" livenessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 10 readinessProbe: httpGet: path: /ready port: 8080 initialDelaySeconds: 5 ``` ### Service Mesh ```yaml apiVersion: networking.istio.io/v1alpha3 kind: VirtualService metadata: name: myapp spec: hosts: - myapp http: - match: - headers: x-canary: exact: "true" route: - destination: host: myapp subset: v2 weight: 100 - route: - destination: host: myapp subset: v1 weight: 100 ``` ### Cloud-Native Patterns - **Sidecar**: Extend container functionality - **Ambassador**: Proxy network connections - **Adapter**: Normalize interfaces - **Circuit Breaker**: Prevent cascade failures - **Bulkhead**: Isolate failures - **Retry with Backoff**: Handle transient failures - **Dead Letter Queue**: Handle failed messages ### Observability Stack ```yaml # Prometheus + Grafana + Loki apiVersion: v1 kind: Pod metadata: name: monitoring spec: containers: - name: prometheus image: prom/prometheus:latest volumeMounts: - name: config mountPath: /etc/prometheus - name: grafana image: grafana/grafana:latest - name: loki image: grafana/loki:latest ``` ### Key Principles - **Microservices**: Small, independent services - **Containerization**: Consistent packaging - **Orchestration**: Automated management - **Immutable Infrastructure**: Replace, don't modify - **Declarative**: Define desired state - **Self-Healing**: Automatic recovery - **Elasticity**: Scale based on load