Deployment

Cpnucleo uses Docker Compose for containerized deployment and GitHub Actions for CI/CD, with final deployment to Hostinger Docker Manager.

Docker Compose Configurations

The project provides three compose configurations that can be layered:

Base (compose.yaml)

The base configuration defines all services with pre-built GHCR images:

All API services depend on db being healthy before starting.

Development Override (compose.override.yaml)

docker compose -f compose.yaml -f compose.override.yaml up --build

Differences from base:

• Builds from source using Dockerfiles in src/
• Build args: AOT=false, TRIM=false, EXTRA_OPTIMIZE=false, BUILD_CONFIGURATION=Debug
• Adds Grafana LGTM OpenTelemetry stack (ports 3000, 4317, 4318)
• Resource limits: 0.4 CPU, 100MB memory per service

Production Override (compose.prod.yaml)

docker compose -f compose.yaml -f compose.prod.yaml up -d

Differences from base:

• restart: always on all services
• Resource reservations: 0.25 CPU / 256MB per API, 0.50 CPU / 512MB per DB
• Resource limits: 0.50 CPU / 512MB per API, 1.0 CPU / 1GB for DB
• JSON logging with rotation: 10MB max size, 3 files retained
• No build step; production image variables such as CPNUCLEO_WEB_API_IMAGE are required and should point at immutable GHCR tags (for example sha-...)

Dockerfiles

Each service has a multi-stage Dockerfile supporting configurable build options:

Build Arguments

Build Stages

1. base – mcr.microsoft.com/dotnet/aspnet:10.0 runtime image
2. build – mcr.microsoft.com/dotnet/sdk:10.0 with clang/zlib for AOT support; restores, builds
3. publish – Publishes with configured optimizations
4. final – Copies published output to runtime image

Platform Support

The release workflow builds linux/amd64 and linux/arm64/v8 images, then merges them into latest and immutable sha-${GITHUB_SHA} manifests.

NGINX Reverse Proxy

NGINX load-balances traffic across two WebApi instances:

upstream api {
    least_conn;
    server webapi1-cpnucleo:5000;
    server webapi2-cpnucleo:5000;
}

server {
    listen 9999;
    location / {
        proxy_pass http://api;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

Configuration Highlights

• least_conn load balancing – sends requests to the server with fewest active connections
• gzip compression – level 5, minimum 256 bytes
• keepalive_timeout: 0 – persistent connections disabled for stateless APIs
• server_tokens: off – hides NGINX version
• access_log: off – disabled for performance
• epoll event model with multi_accept

GitHub Actions CI/CD

Build Check (build-check.yml)

Triggered on pull requests to main.

Jobs:

1. Setup, Build & Test (matrix: WebApi, GrpcServer, IdentityApi, WebClient)

   • Checkout repository
   • Setup .NET SDK (from global.json)
   • Restore dependencies
   • Build application (Debug, no AOT/Trim)
   • Run Architecture Tests

2. Container Healthcheck Test (depends on build)

   • Build Docker image from source
   • Start container via Docker Compose
   • Poll /healthz endpoint up to 20 times with 5-second intervals
   • Fail if health check does not return 200

Main Release (main-release.yml)

Triggered on push to main and manual dispatch.

Jobs:

1. Setup, Build & Test – Same as build check but with TRIM=true, EXTRA_OPTIMIZE=true, BUILD_CONFIGURATION=Release

2. Build & Push Docker Images (depends on test)

   • Build linux/amd64 images tagged sha-${GITHUB_SHA}-amd64 and latest
   • Build linux/arm64/v8 images tagged sha-${GITHUB_SHA}-arm64 and latest-arm64
   • Merge both architectures into multi-arch sha-${GITHUB_SHA} and latest manifests for each GHCR image

3. Container Healthcheck Test (depends on push)

   • Pull production images
   • Run healthcheck validation

4. Deploy to Hostinger Docker Manager (depends on amd64 images + container health checks)

   • Deploy the production Compose project through scripts/deploy-hostinger-docker-manager.sh
   • Uses Hostinger project secrets plus immutable sha-${GITHUB_SHA}-amd64 GHCR image tags
   • Verifies the public WebClient, WebApi, IdentityApi, and gRPC health routes after deployment

Hostinger Deployment Targets

Environment Variables

Required (.env)

GitHub Secrets (for CI/CD)

Network

All services communicate over a shared Docker bridge network:

networks:
  default:
    name: cpnucleo_network
    driver: bridge

Service discovery uses Docker DNS (e.g., db, webapi1-cpnucleo).