====== Runbook: Docker ======

<WRAP round info>
**Duration:** ~15 minutes \\
**Role:** DevOps, Developer \\
**Prerequisite:** Docker Engine 20+
</WRAP>

Run Data Gateway as Docker container.

----

===== Workflow =====

<mermaid>
flowchart TD
    A[Start] --> B[Create Dockerfile]
    B --> C[Build image]
    C --> D[Start container]
    D --> E[Health Check]
    E --> F{OK?}
    F -->|Yes| G[Done]
    F -->|No| H[Check docker logs]

    style G fill:#e8f5e9
    style H fill:#ffebee
</mermaid>

----

===== 1. Dockerfile =====

<code dockerfile>
# Dockerfile
FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS runtime
WORKDIR /app

# Copy Gateway files
COPY publish/ .

# Non-root user
RUN useradd --system --no-create-home appuser
USER appuser

# Port
EXPOSE 5000

# Healthcheck
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
    CMD curl -f http://localhost:5000/health || exit 1

# Start
ENTRYPOINT ["dotnet", "WvdS.WebAPI.Data.Gateway.Api.dll"]
</code>

----

===== 2. Build Image =====

<code bash>
# Build image
docker build -t data-gateway:latest .

# Tag image (for registry)
docker tag data-gateway:latest registry.example.com/data-gateway:v3.0
</code>

----

===== 3. Start Container =====

**Simple start:**

<code bash>
docker run -d \
    --name gateway \
    -p 5000:5000 \
    -v $(pwd)/appsettings.json:/app/appsettings.json:ro \
    -v $(pwd)/data:/app/data \
    data-gateway:latest
</code>

**With all options:**

<code bash>
docker run -d \
    --name gateway \
    --restart unless-stopped \
    -p 5000:5000 \
    -v $(pwd)/config/appsettings.json:/app/appsettings.json:ro \
    -v $(pwd)/data:/app/data \
    -v $(pwd)/logs:/app/logs \
    -e ASPNETCORE_ENVIRONMENT=Production \
    -e TZ=Europe/Berlin \
    --memory=512m \
    --cpus=1 \
    --health-cmd="curl -f http://localhost:5000/health || exit 1" \
    --health-interval=30s \
    data-gateway:latest
</code>

----

===== 4. Docker Compose =====

<code yaml>
# docker-compose.yml
version: '3.8'

services:
  gateway:
    image: data-gateway:latest
    build:
      context: .
      dockerfile: Dockerfile
    container_name: data-gateway
    restart: unless-stopped
    ports:
      - "5000:5000"
    volumes:
      - ./config/appsettings.json:/app/appsettings.json:ro
      - ./data:/app/data
      - gateway-logs:/app/logs
    environment:
      - ASPNETCORE_ENVIRONMENT=Production
      - TZ=Europe/Berlin
    deploy:
      resources:
        limits:
          memory: 512M
          cpus: '1'
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:5000/health"]
      interval: 30s
      timeout: 5s
      retries: 3
      start_period: 10s
    networks:
      - gateway-net

  # Optional: Database for demo
  demo-db:
    image: postgres:16-alpine
    container_name: demo-db
    restart: unless-stopped
    environment:
      - POSTGRES_USER=gateway
      - POSTGRES_PASSWORD=gateway123
      - POSTGRES_DB=demo
    volumes:
      - postgres-data:/var/lib/postgresql/data
    networks:
      - gateway-net

volumes:
  gateway-logs:
  postgres-data:

networks:
  gateway-net:
    driver: bridge
</code>

**Start:**

<code bash>
# Start all services
docker-compose up -d

# Show logs
docker-compose logs -f gateway

# Stop
docker-compose down
</code>

----

===== 5. Health Check =====

<code bash>
# Container status
docker ps

# Health status
docker inspect --format='{{.State.Health.Status}}' gateway

# API test
curl http://localhost:5000/health
curl http://localhost:5000/api/v1/dsn/demo/tables
</code>

----

===== 6. Manage Container =====

| Command | Description |
|---------|-------------|
| ''docker start gateway'' | Start |
| ''docker stop gateway'' | Stop |
| ''docker restart gateway'' | Restart |
| ''docker logs gateway'' | Show logs |
| ''docker logs -f gateway'' | Live logs |
| ''docker exec -it gateway sh'' | Shell in container |

----

===== 7. Checklist =====

| # | Check | Done |
|---|-------|------|
| 1 | Dockerfile created | [ ] |
| 2 | Image built | [ ] |
| 3 | appsettings.json mounted | [ ] |
| 4 | Container started | [ ] |
| 5 | Health Check OK | [ ] |
| 6 | Logs without errors | [ ] |

----

===== Troubleshooting =====

| Problem | Cause | Solution |
|---------|-------|----------|
| ''Container won't start'' | Config error | ''docker logs gateway'' |
| ''Port already in use'' | Host port taken | Use different port |
| ''Permission denied'' | Volume permissions | ''chmod'' on host |
| ''Cannot connect to DB'' | Network problem | Check Docker network |

**Container shell for debugging:**

<code bash>
# Shell in running container
docker exec -it gateway sh

# Or with bash (if available)
docker exec -it gateway bash

# Check files in container
docker exec gateway ls -la /app/
docker exec gateway cat /app/appsettings.json
</code>

----

===== Multi-Stage Build (optimized) =====

<code dockerfile>
# Multi-Stage Dockerfile
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY *.csproj .
RUN dotnet restore
COPY . .
RUN dotnet publish -c Release -o /app/publish

FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS runtime
WORKDIR /app
COPY --from=build /app/publish .
RUN useradd --system --no-create-home appuser
USER appuser
EXPOSE 5000
HEALTHCHECK --interval=30s --timeout=5s CMD curl -f http://localhost:5000/health || exit 1
ENTRYPOINT ["dotnet", "WvdS.WebAPI.Data.Gateway.Api.dll"]
</code>

----

===== Related Runbooks =====

  * [[.:kubernetes|Kubernetes]] - Cluster deployment
  * [[..:monitoring:prometheus|Prometheus]] - Export metrics
  * [[.:systemd|systemd]] - Bare-metal alternative

----

<< [[.:systemd|<- systemd]] | [[.:kubernetes|-> Kubernetes]] >>

----
//Wolfgang van der Stille @ EMSR DATA d.o.o. - Data Gateway Professional//

{{tag>operator runbook docker container compose}}