Dockerfile

# Use Debian as build OS (https://github.com/nodejs/docker-node/issues/1973)
FROM node:slim AS BUILD

ENV NODE_ENV="production"

# Set the working directory in the container
WORKDIR /app

# Copy package.json and package-lock.json (if available)
COPY package*.json ./

# Install dependencies
RUN npm i --verbose

# Use Alpine Linux as base image
FROM node:alpine

# Set default env variable values
ENV PORT=3000
ENV IMG_PATH="img/background"
ENV ORIGIN="http://localhost:3000"
ENV UNIFI_SITE="default"
ENV UNIFI_PORT="443"
ENV UNIFI_TLS=false
ENV REDIS_HOST="redis"
ENV REDIS_PORT=6379
ENV NODE_ENV="production"

WORKDIR /app

# Copy modules from the build stage
COPY --from=0 /app/node_modules ./node_modules

# Copy the rest of the application code
COPY . .

# Expose the port on which the Node.js application will run
EXPOSE 3000/tcp

# Configure healthcheck
HEALTHCHECK --start-period=10s --interval=1m --timeout=5s --retries=3 CMD node healthcheck.js || exit 1

# Command to run the Node.js application
CMD ["node", "server.js"]