Introduction
Deploying a Node.js app can be a complex process, especially when it comes to managing dependencies, environment variables, and infrastructure. Docker Compose is a tool that makes it easy to define and run multi-container Docker applications. It simplifies the process of deploying and managing complex applications by providing a simple way to define the environment and dependencies for each service in your app. In this tutorial, we'll walk through the process of deploying a Node.js todo app with Docker Compose. We'll start by creating a Dockerfile for our app, then we'll define the services that make up our app in a docker-compose.yml file, and finally, we'll build and run our app with Docker Compose. Let's get started!
Prerequisites
- Basic knowledge of Docker and Docker Compose
- Docker installed on your local machine
- A Node.js todo app (you can use any existing app or create a new one)
Step 1: Create a Dockerfile
The first step is to create a Dockerfile for your Node.js app. This file will define the environment for your app and how to build the container image. Here's an example Dockerfile:
This Dockerfile uses the official Node.js 14 Alpine image as its base, sets the working directory to /app, copies the package.json and package-lock.json files to the working directory, installs the dependencies, copies the rest of the app files, exposes port 8000, and starts the app.
Step 2: Create a docker-compose.yml file
The next step is to create a docker-compose.yml file to define the services that make up your app. Example docker-compose.yml file given above.
Step 3: Build and run the app
To build and run the app with Docker Compose, navigate to the directory that contains the docker-compose.yml file and run the following command:
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docker-compose up
This command will build the images and start the containers for the web and db services. You should see the output from your app in the console.
Step 4: Test the app
To test the app, open a web browser and navigate to http://localhost:3000. You should see your todo app running.
Conclusion
In this tutorial, you learned how to deploy a Node.js todo app with Docker Compose. You created a Dockerfile to define the environment for your app, created a docker-compose.yml file to define the services that make up your app, built and ran the app with Docker Compose, and tested the app. This approach makes it easy to deploy your app in any environment, and ensures that your app is consistent across all environments.
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