Docker containerization in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Docker containerization?

Docker containerization is a way to package an application and all its parts, like code and libraries, into a single container. This container runs the same way on any computer, making it easy to share and deploy apps.

beginner

Why use Docker with FastAPI?

Using Docker with FastAPI helps you run your API in a consistent environment. It avoids problems like "it works on my machine" by packaging FastAPI and its dependencies together.

beginner

What is a Dockerfile?

A Dockerfile is a simple text file with instructions to build a Docker image. It tells Docker how to set up the environment, install dependencies, and run your FastAPI app.

intermediate

How do you expose a port in a Docker container for FastAPI?

You expose a port in the Dockerfile using the EXPOSE command and map it when running the container with the -p option, like -p 8000:8000, so you can access FastAPI outside the container.

intermediate

What command runs a FastAPI app inside a Docker container?

You use a command like: uvicorn main:app --host 0.0.0.0 --port 8000 inside the container to start the FastAPI server and listen on all network interfaces.

What does a Docker container include?

A Only the database

B Only the application code

C Only the operating system

D Application code and all dependencies

A Docker container packages the application code along with all its dependencies to run consistently anywhere.

Which file tells Docker how to build an image?

A Dockerfile

B requirements.txt

C main.py

D docker-compose.yml

The Dockerfile contains step-by-step instructions to build a Docker image.

How do you make a FastAPI app accessible outside the Docker container?

A Use a different programming language

B Expose and map the port with -p option

C Install extra packages inside the container

D Restart the Docker daemon

You expose the port in the Dockerfile and map it to the host machine using the -p option when running the container.

What command starts a FastAPI app inside a Docker container?

A docker build .

B python main.py

C uvicorn main:app --host 0.0.0.0 --port 8000

D pip install fastapi

This command runs the FastAPI app with Uvicorn, listening on all interfaces inside the container.

Why is Docker useful for deploying FastAPI apps?

A It ensures the app runs the same everywhere

B It makes the app run faster on all machines

C It replaces the need for Python

D It automatically writes code

Docker packages the app and environment so it behaves the same on any machine.

Explain how Docker helps in running a FastAPI application smoothly on different computers.

Think about how Docker bundles everything needed to run the app.

Describe the steps to create and run a Docker container for a FastAPI app.

Consider the process from writing instructions to accessing the app in a browser.