Docker for Node.js

docker-compose.yml

version: '3.8'

services:
  # Development version of the app
  cra-test-dev:
    build:
      context: .
      dockerfile: Dockerfile.dev
    ports:
      - '3000:3000'
    volumes:
      - '/usr/src/app/node_modules'
      - '.:/usr/src/app'
    environment:
      - CHOKIDAR_USEPOLLING=true
      - WATCHPACK_POLLING=true

  # Production version of the app
  cra-test-prod:
    build:
      context: .
      dockerfile: Dockerfile.prod
    ports:
      - '3000:3000'

Dockerfile.dev

# Use the node:18 image as the base for the Docker image
FROM node:18

LABEL name="app-dev"

# Set the working directory for the app
WORKDIR /usr/src/app

# Copy the entire project directory to the Docker image
COPY . .

# Update packages to latest minor versions
RUN npx npm-check-updates --target minor -u

# Install the app's dependencies
RUN npm install

# Expose port 3000 so it can be accessed from the host
EXPOSE 3000

# Define a healthcheck for the app
HEALTHCHECK --interval=30s --timeout=3s \
  CMD curl -f http://localhost:3000/health || exit 1

# Start the app
CMD ["npm", "start"]

Dockerfile.prod

# Use the node:18 image as the base for the Docker image
FROM node:18

LABEL name="app-prod"

# Set the working directory for the app
WORKDIR /usr/src/app

# Copy the entire project directory to the Docker image
COPY . .

# Update packages to latest minor versions
RUN npx npm-check-updates --target minor -u

# Install the app's dependencies
RUN npm ci --only=production

# Expose port 3000 so it can be accessed from the host
EXPOSE 3000

# Define a healthcheck for the app
HEALTHCHECK --interval=30s --timeout=3s \
  CMD curl -f http://localhost:3000/health || exit 1

# Start the app
CMD ["npm", "build"]