How to Use Dockerfile to Automate Image Creation

A Dockerfile is a script that contains instructions on how to build a Docker image. This article explains how to create and use a Dockerfile.

Creating a Dockerfile

Create a file named Dockerfile with the following content:

FROM ubuntu:latest
RUN apt-get update && apt-get install -y nginx
CMD ["nginx", "-g", "daemon off;"]

Building an Image

Build an image from the Dockerfile:

docker build -t my_nginx_image .

Running a Container from the Image

Run a container from the created image:

docker run -d -p 80:80 my_nginx_image

Conclusion

Using Dockerfile automates the process of creating Docker images, making it easier to manage and deploy your applications consistently.