Introduction to Docker for Web Developers

Learn how Docker simplifies development and deployment using containers.

Jacob Evenson Mon Feb 16 2026 18:00:00 GMT-0600 (Central Standard Time)

Introduction to Docker for Web Developers

Docker is a containerization platform that allows developers to package applications and their dependencies into portable containers.

Why Docker?

Docker solves common development problems:

• "It works on my machine"
• Dependency conflicts
• Environment inconsistencies
• Deployment issues

Installing Docker

After installing Docker Desktop, verify the installation:

docker --version

Running Your First Container

To run a simple container:

docker run hello-world

This command downloads and runs a test container.

Running a Web Server in Docker

You can run an NGINX web server with:

docker run -d -p 8080:80 nginx

Explanation:

• -d runs the container in detached mode
• -p 8080:80 maps port 8080 on your machine to port 80 inside the container
• nginx is the image name

Visit:

http://localhost:8080

You should see the default NGINX page.

Building a Custom Docker Image

Create a file named Dockerfile:

FROM node:20

WORKDIR /app

COPY package*.json ./
RUN npm install

COPY . .

EXPOSE 3000

CMD ["node", "app.js"]

Build the image:

docker build -t my-node-app .

Run it:

docker run -p 3000:3000 my-node-app

Benefits of Docker in DevOps

Docker enables:

• Consistent environments
• Easier CI/CD integration
• Faster deployments
• Better scalability

It is now a standard tool in modern DevOps workflows.

Conclusion

Docker simplifies development, testing, and deployment. For web developers, learning Docker is a major advantage in professional environments.