[deploy/k8s] Kubernetes deployment via Helm: chart, values, secrets, autoscaling, CI

[Copilot]

This PR implements a comprehensive Kubernetes deployment solution for LLM Proxy using Helm charts, including production-ready configuration, autoscaling, CI integration, and optional AWS CDK/EKS deployment.

🚀 What's New

Helm Chart Implementation (deploy/helm/llm-proxy/)

• Complete Helm chart with 15+ Kubernetes resources including Deployment, Service, Ingress, HPA, PodDisruptionBudget, NetworkPolicy, and monitoring resources
• Flexible Redis configuration supporting both in-cluster Bitnami Redis dependency and external Redis endpoints
• Multi-container dispatcher deployment for event processing (file logging, Helicone integration)
• Production security hardening with non-root containers, read-only filesystem, seccomp profiles, and security contexts
• Comprehensive health checks with configurable liveness, readiness, and startup probes

AWS CDK Integration (deploy/aws-cdk/)

• Infrastructure-as-Code for complete EKS cluster provisioning
• AWS services integration including Load Balancer Controller, EBS/EFS CSI drivers, Cluster Autoscaler
• IRSA (IAM Roles for Service Accounts) for secure AWS service access
• External Secrets Operator integration with AWS Secrets Manager
• TypeScript CDK stack with comprehensive testing and validation

CI/CD Pipeline Enhancement

• Helm chart validation with linting, template rendering, and security scanning (Checkov)
• CDK synthesis and validation with CloudFormation template testing
• Chart testing integration with automated Helm tests
• Cost estimation for infrastructure deployments
• Security scanning for both Kubernetes manifests and CloudFormation templates

🔧 Key Features

Production-Ready Configuration

• Horizontal Pod Autoscaler with CPU/memory target tracking and custom metrics support
• Pod Disruption Budget for high availability during rolling updates
• Network policies for secure pod-to-pod communication
• Persistent volumes for data and logs with configurable storage classes
• Monitoring integration with ServiceMonitor and PodMonitor for Prometheus

Flexible Deployment Options

• Environment-specific values with development and production examples
• External database support (PostgreSQL) with connection pooling
• Ingress configuration with TLS, rate limiting, and load balancer annotations
• Topology spread constraints for multi-AZ deployment
• Node affinity and tolerations for dedicated workload nodes

Security Best Practices

• External secrets management with AWS Secrets Manager integration
• Service account with minimal permissions using IRSA
• Container security with dropped capabilities and read-only root filesystem
• Network isolation with configurable network policies
• TLS termination and certificate management support

📚 Documentation

Comprehensive Guides

• docs/kubernetes-helm.md - Complete deployment guide with installation, configuration, troubleshooting, and security considerations
• deploy/aws-cdk/README.md - AWS CDK setup, deployment, and operations guide
• Example values files for development and production environments with detailed configuration options

Quick Start Examples

# Development deployment
helm install llm-proxy deploy/helm/llm-proxy \
  --values deploy/helm/llm-proxy/examples/values-development.yaml \
  --set config.managementToken="$(openssl rand -base64 32)"

# Production deployment with AWS CDK
cd deploy/aws-cdk
npm install
cdk deploy --context @examples/cdk-prod.json

🧪 Testing & Validation

• Helm chart linting and template validation across multiple configuration scenarios
• CDK synthesis testing with CloudFormation template validation
• Security scanning with Checkov for both Kubernetes and CloudFormation resources
• Automated Helm tests for health endpoint validation
• TypeScript CDK tests with AWS CDK assertions

💰 Cost Considerations

The production AWS deployment includes cost optimization features:

• Cluster autoscaler for automatic node scaling based on demand
• Spot instance support for development environments
• Resource requests/limits tuning for optimal utilization
• Storage optimization with appropriate volume sizes and storage classes

Estimated monthly cost for production deployment: ~$500-2000 USD depending on load and configuration.

🔄 Migration Path

This implementation is fully backward compatible with existing Docker deployments and provides a clear migration path to Kubernetes with minimal configuration changes.

Fixes #49.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• charts.bitnami.com
  • Triggering command: helm dependency update (dns block)
• get.helm.sh
  • Triggering command: curl -L --silent --show-error --fail REDACTED (dns block)
  • Triggering command: wget REDACTED (dns block)
• invalid-host
  • Triggering command: /tmp/go-build4152644057/b342/admin.test -test.testlogfile=/tmp/go-build4152644057/b342/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.parallel=8 -test.v=true (dns block)
• invalid-host-that-does-not-exist
  • Triggering command: /tmp/go-build4152644057/b342/admin.test -test.testlogfile=/tmp/go-build4152644057/b342/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.parallel=8 -test.v=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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