How do I use dotenv with Docker?

How do I use dotenv with Docker?

You can use dotenv with Docker by creating a .env file and referencing it in your Dockerfile or docker-compose.yml.

Can you show me an example of a Dockerfile that uses dotenv?

Sure! Here's a simple example:

FROM node:14

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

# Copy package.json and install dependencies
COPY package*.json ./
RUN npm install

# Copy the rest of the application
COPY . .

# Copy the .env file
COPY .env .

# Start the application
CMD [ "node", "app.js" ]

What about using it with docker-compose?

In your docker-compose.yml, you can specify the .env file like this:

version: '3'
services:
  app:
    build: .
    env_file:
      - .env
    ports:
      - "3000:3000"

Are there any best practices for using dotenv with Docker?

Yes, keep your .env file out of version control, use environment variables for sensitive data, and document your environment setup.