Deploy FastAPI applications with Docker Compose and production optimization

Install Docker and Docker Compose

First, install Docker Engine and Docker Compose on your system.

sudo apt update
sudo apt install -y apt-transport-https ca-certificates curl gnupg lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
sudo usermod -aG docker $USER
newgrp docker

sudo dnf update -y
sudo dnf install -y dnf-utils
sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo dnf install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
sudo systemctl enable --now docker
sudo usermod -aG docker $USER
newgrp docker

Create project structure

Set up the directory structure for your FastAPI application with all necessary files.

mkdir fastapi-docker && cd fastapi-docker
mkdir app nginx
touch docker-compose.yml .env
touch app/main.py app/requirements.txt app/Dockerfile
touch nginx/nginx.conf

Create FastAPI application

Build a sample FastAPI application with database and Redis connections.

from fastapi import FastAPI, HTTPException, Depends
from sqlalchemy import create_engine, Column, Integer, String, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from datetime import datetime
import redis
import os
import json
from typing import Optional

app = FastAPI(title="FastAPI Docker Demo", version="1.0.0")

Database configuration
DATABASE_URL = os.getenv("DATABASE_URL", "postgresql://fastapi:password@postgres:5432/fastapi_db")
engine = create_engine(DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

Redis configuration
redis_client = redis.Redis(
    host=os.getenv("REDIS_HOST", "redis"),
    port=int(os.getenv("REDIS_PORT", "6379")),
    decode_responses=True
)

Database model
class Item(Base):
    __tablename__ = "items"
    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, index=True)
    description = Column(String)
    created_at = Column(DateTime, default=datetime.utcnow)

Base.metadata.create_all(bind=engine)

Dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

@app.get("/")
async def root():
    return {"message": "FastAPI with Docker Compose", "status": "healthy"}

@app.get("/health")
async def health_check():
    # Test database connection
    try:
        db = next(get_db())
        db.execute("SELECT 1")
        db_status = "healthy"
    except Exception as e:
        db_status = f"unhealthy: {str(e)}"
    
    # Test Redis connection
    try:
        redis_client.ping()
        redis_status = "healthy"
    except Exception as e:
        redis_status = f"unhealthy: {str(e)}"
    
    return {
        "status": "healthy",
        "database": db_status,
        "redis": redis_status,
        "timestamp": datetime.utcnow().isoformat()
    }

@app.post("/items")
async def create_item(name: str, description: str, db: Session = Depends(get_db)):
    item = Item(name=name, description=description)
    db.add(item)
    db.commit()
    db.refresh(item)
    
    # Cache the item
    redis_client.setex(
        f"item:{item.id}",
        3600,
        json.dumps({
            "id": item.id,
            "name": item.name,
            "description": item.description,
            "created_at": item.created_at.isoformat()
        })
    )
    
    return {"id": item.id, "name": item.name, "description": item.description}

@app.get("/items/{item_id}")
async def get_item(item_id: int, db: Session = Depends(get_db)):
    # Try cache first
    cached_item = redis_client.get(f"item:{item_id}")
    if cached_item:
        return {"source": "cache", "item": json.loads(cached_item)}
    
    # Fallback to database
    item = db.query(Item).filter(Item.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")
    
    item_data = {
        "id": item.id,
        "name": item.name,
        "description": item.description,
        "created_at": item.created_at.isoformat()
    }
    
    # Cache for future requests
    redis_client.setex(f"item:{item_id}", 3600, json.dumps(item_data))
    
    return {"source": "database", "item": item_data}

Define Python dependencies

Create requirements file with all necessary packages for the FastAPI application.

fastapi==0.104.1
uvicorn[standard]==0.24.0
psycopg2-binary==2.9.9
sqlalchemy==2.0.23
redis==5.0.1
python-multipart==0.0.6

Create FastAPI Dockerfile

Build a production-optimized Docker image for the FastAPI application.

FROM python:3.11-slim

Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
ENV PATH="/home/appuser/.local/bin:${PATH}"

Create non-root user
RUN groupadd -r appuser && useradd -r -g appuser appuser

Install system dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        gcc \
        libpq-dev \
    && rm -rf /var/lib/apt/lists/*

Set work directory
WORKDIR /app

Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

Copy application code
COPY . .

Change ownership to non-root user
RUN chown -R appuser:appuser /app
USER appuser

Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8000/health', timeout=10)"

Run the application
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]

Configure environment variables

Set up environment variables for database credentials and application configuration.

# Database configuration
POSTGRES_DB=fastapi_db
POSTGRES_USER=fastapi
POSTGRES_PASSWORD=secure_password_123
DATABASE_URL=postgresql://fastapi:secure_password_123@postgres:5432/fastapi_db

Redis configuration
REDIS_HOST=redis
REDIS_PORT=6379

Application configuration
FASTAPI_ENV=production
WORKERS=4

Configure Nginx reverse proxy

Set up Nginx as a reverse proxy with SSL support and security headers.

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    
    # Security headers
    add_header X-Frame-Options DENY always;
    add_header X-Content-Type-Options nosniff always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;
    
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    
    # Upstream backend
    upstream fastapi_backend {
        least_conn;
        server app:8000 max_fails=3 fail_timeout=30s;
    }
    
    server {
        listen 80;
        server_name example.com www.example.com;
        
        # Health check endpoint
        location /nginx-health {
            access_log off;
            return 200 "healthy";
            add_header Content-Type text/plain;
        }
        
        # API endpoints with rate limiting
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            
            proxy_pass http://fastapi_backend;
            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;
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
        }
        
        # All other requests
        location / {
            proxy_pass http://fastapi_backend;
            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;
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
        }
    }
}

Create Docker Compose configuration

Define the complete stack with FastAPI, PostgreSQL, Redis, and Nginx services.

version: '3.8'

services:
  app:
    build: ./app
    container_name: fastapi-app
    restart: unless-stopped
    environment:
      - DATABASE_URL=${DATABASE_URL}
      - REDIS_HOST=${REDIS_HOST}
      - REDIS_PORT=${REDIS_PORT}
    depends_on:
      - postgres
      - redis
    networks:
      - app-network
    healthcheck:
      test: ["CMD", "python", "-c", "import requests; requests.get('http://localhost:8000/health', timeout=10)"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

  postgres:
    image: postgres:16-alpine
    container_name: fastapi-postgres
    restart: unless-stopped
    environment:
      POSTGRES_DB: ${POSTGRES_DB}
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
    volumes:
      - postgres_data:/var/lib/postgresql/data
    networks:
      - app-network
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
      interval: 30s
      timeout: 10s
      retries: 3

  redis:
    image: redis:7-alpine
    container_name: fastapi-redis
    restart: unless-stopped
    command: redis-server --appendonly yes --requirepass redis_password_123
    volumes:
      - redis_data:/data
    networks:
      - app-network
    healthcheck:
      test: ["CMD", "redis-cli", "-a", "redis_password_123", "ping"]
      interval: 30s
      timeout: 10s
      retries: 3

  nginx:
    image: nginx:1.25-alpine
    container_name: fastapi-nginx
    restart: unless-stopped
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
      - ./nginx/ssl:/etc/nginx/ssl:ro
    depends_on:
      - app
    networks:
      - app-network
    healthcheck:
      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost/nginx-health"]
      interval: 30s
      timeout: 10s
      retries: 3

networks:
  app-network:
    driver: bridge

volumes:
  postgres_data:
    driver: local
  redis_data:
    driver: local

Deploy the application stack

Start all services using Docker Compose and verify they're running correctly.

docker compose up -d
docker compose ps
docker compose logs -f

Configure production resource limits

Add resource constraints to prevent any single service from overwhelming the system. This builds on container resource management techniques.

version: '3.8'

services:
  app:
    deploy:
      resources:
        limits:
          cpus: '2.0'
          memory: 1G
        reservations:
          cpus: '0.5'
          memory: 512M
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

  postgres:
    deploy:
      resources:
        limits:
          cpus: '1.0'
          memory: 512M
        reservations:
          cpus: '0.25'
          memory: 256M
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

  redis:
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 256M
        reservations:
          cpus: '0.1'
          memory: 128M
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

  nginx:
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 256M
        reservations:
          cpus: '0.1'
          memory: 128M
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

Set up SSL certificates

Generate SSL certificates for HTTPS support in production environments.

mkdir -p nginx/ssl
For development - self-signed certificate
openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
  -keyout nginx/ssl/server.key \
  -out nginx/ssl/server.crt \
  -subj "/C=US/ST=State/L=City/O=Organization/CN=example.com"

Set proper permissions
chmod 600 nginx/ssl/server.key
chmod 644 nginx/ssl/server.crt

Update Nginx for SSL

Add SSL configuration to the Nginx reverse proxy for secure connections.

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    
    # Upstream backend
    upstream fastapi_backend {
        least_conn;
        server app:8000 max_fails=3 fail_timeout=30s;
    }
    
    # Redirect HTTP to HTTPS
    server {
        listen 80;
        server_name example.com www.example.com;
        return 301 https://$server_name$request_uri;
    }
    
    # HTTPS server
    server {
        listen 443 ssl http2;
        server_name example.com www.example.com;
        
        # SSL configuration
        ssl_certificate /etc/nginx/ssl/server.crt;
        ssl_certificate_key /etc/nginx/ssl/server.key;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;
        
        # Security headers
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options DENY always;
        add_header X-Content-Type-Options nosniff always;
        
        # API endpoints
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://fastapi_backend;
            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;
        }
        
        # All other requests
        location / {
            proxy_pass http://fastapi_backend;
            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;
        }
    }
}

Add monitoring and health checks

Implement comprehensive monitoring for all services in the stack.

version: '3.8'

services:
  prometheus:
    image: prom/prometheus:v2.45.0
    container_name: fastapi-prometheus
    restart: unless-stopped
    ports:
      - "9090:9090"
    volumes:
      - ./monitoring/prometheus.yml:/etc/prometheus/prometheus.yml:ro
      - prometheus_data:/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/etc/prometheus/console_libraries'
      - '--web.console.templates=/etc/prometheus/consoles'
      - '--storage.tsdb.retention.time=200h'
      - '--web.enable-lifecycle'
    networks:
      - app-network

  grafana:
    image: grafana/grafana:10.1.0
    container_name: fastapi-grafana
    restart: unless-stopped
    ports:
      - "3000:3000"
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin_password_123
    volumes:
      - grafana_data:/var/lib/grafana
      - ./monitoring/grafana/dashboards:/var/lib/grafana/dashboards
      - ./monitoring/grafana/provisioning:/etc/grafana/provisioning
    networks:
      - app-network

volumes:
  prometheus_data:
    driver: local
  grafana_data:
    driver: local

Configure Prometheus monitoring

Set up Prometheus to collect metrics from all services in the stack.

mkdir -p monitoring/grafana/{dashboards,provisioning}
touch monitoring/prometheus.yml

global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
      - targets: ['localhost:9090']

  - job_name: 'fastapi-app'
    static_configs:
      - targets: ['app:8000']
    metrics_path: '/metrics'
    scrape_interval: 10s

  - job_name: 'nginx'
    static_configs:
      - targets: ['nginx:80']
    metrics_path: '/nginx-health'
    scrape_interval: 15s

  - job_name: 'postgres'
    static_configs:
      - targets: ['postgres:5432']
    scrape_interval: 30s

  - job_name: 'redis'
    static_configs:
      - targets: ['redis:6379']
    scrape_interval: 30s