Build Your First Docker Image
Explore how to automate application setup by writing a Dockerfile. Learn the essential Dockerfile commands like FROM, WORKDIR, COPY, RUN, and CMD to build a reusable Docker image of your Python app. This lesson helps you understand how Docker images and containers work together to run your app consistently across environments.
We'll cover the following...
In the last lesson, we saw how to run an app using a virtual environment. In this lesson, we will automate the steps required to run the app. We will do it with the help of Docker.
Clone the project using
git clone https://github.com/venky8283/Docker.git
Type
git checkout d469419582ee877067f6d449c9691ad16e5f3365to get to the code used in this lesson.
The Docker engine executes all commands on your behalf, but we need to tell Docker what commands we want to execute. So, Docker has something called a Dockerfile. All the steps mentioned in the Dockerfile are executed step by step as we saw in the Docker fundamentals section. Create a file named ‘Dockerfile’ at the same level as of the app.py file. Dockerfile will have no extension.
Writing a Dockerfile
While writing a Dockerfile, we start with a main dependency of the app. Docker runs ...