Dockerfile

# Use Node.js 20 Alpine for smaller image size
FROM node:20-alpine AS base

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init

# Set working directory
WORKDIR /usr/src/app

# Create non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nodejs

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm ci --only=production && npm cache clean --force

# Create logs directory
RUN mkdir -p logs && chown -R nodejs:nodejs logs

# Copy source code
COPY --chown=nodejs:nodejs . .

# Build the application
RUN npm run build

# Create production image
FROM node:20-alpine AS production

# Install dumb-init
RUN apk add --no-cache dumb-init

# Set working directory
WORKDIR /usr/src/app

# Copy built application from base stage
COPY --from=base --chown=nodejs:nodejs /usr/src/app/dist ./dist
COPY --from=base --chown=nodejs:nodejs /usr/src/app/node_modules ./node_modules
COPY --from=base --chown=nodejs:nodejs /usr/src/app/package.json ./package.json
COPY --from=base --chown=nodejs:nodejs /usr/src/app/logs ./logs

# Create non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nodejs

# Set environment variables
ENV NODE_ENV=production
ENV PORT=3000

# Create volume for logs
VOLUME ["/usr/src/app/logs"]

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:${PORT}/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) }).on('error', () => process.exit(1))"

# Switch to non-root user
USER nodejs

# Expose port
EXPOSE 3000

# Use dumb-init to handle signals properly
ENTRYPOINT ["dumb-init", "--"]

# Start the application
CMD ["node", "dist/index.js"]