demo_docs/Templates/Docker Template.md

docker-compose.yml

services:
  db:
    image: postgres:15
    environment:
      POSTGRES_USER: ${DB_USER}
      POSTGRES_PASSWORD: ${DB_PASSWORD}
      POSTGRES_DB: ${DB_NAME}
    volumes:
      - db_data:/var/lib/postgresql/data
      - ./migrations:/docker-entrypoint-initdb.d
    ports:
      - "5432:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${DB_USER} -d ${DB_NAME}"]
      interval: 5s
      timeout: 5s
      retries: 5
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 512M
  adminer:
    image: adminer
    restart: always
    ports:
      - "8081:8080"
    depends_on:
      db:
        condition: service_healthy
  app:
    build: .
    environment:
      DB_HOST: db
      DB_USER: ${DB_USER}
      DB_PASSWORD: ${DB_PASSWORD}
      DB_NAME: ${DB_NAME}
      DB_PORT: "5432"
      LOG_LEVEL: "debug"
    ports:
      - "8080:8080"
    depends_on:
      db:
        condition: service_healthy
    deploy:
      resources:
        limits:
          cpus: '1'
          memory: 1G
volumes:
  db_data:
  pgdata_dev:
networks:
  default:
    name: matching_network
    driver: bridge

Dockerfile
# Build stage
FROM golang:1.23-alpine AS builder
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o matching-app cmd/server/main.go  

# Final image
FROM alpine:3.18
WORKDIR /app

# Add non-root user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
  
# Copy binary and resources
COPY --from=builder --chown=appuser:appgroup /app/matching-app .
COPY --from=builder --chown=appuser:appgroup /app/migrations ./migrations
COPY --from=builder --chown=appuser:appgroup /app/configs ./configs

# Environment variables
ENV APP_PORT=8080
ENV APP_ENV=production  

# Install wget for healthcheck
RUN apk --no-cache add wget  

# Healthcheck
HEALTHCHECK --interval=30s --timeout=3s \
  CMD wget --no-verbose --tries=1 --spider http://localhost:${APP_PORT}/health || exit 1

EXPOSE ${APP_PORT}
USER appuser
ENTRYPOINT ["/app/matching-app"]
CMD []