The Complete Practical Docker Guide - Creating Dockerfile for the Python API Service

This tutorial guides you through creating a custom Docker image for an API application. It covers setting up a Dockerfile, choosing a Python base image, configuring the working directory, exposing necessary ports, and installing Python dependencies. The tutorial also explains how to copy application files into the Docker image and set up the CMD instruction to run the application. By the end, you'll understand how to build and run a Docker container for a Python Flask web server.

What is the purpose of creating a Dockerfile in the root of the API folder?

• To store all application files

• To run the application directly

• To expose application ports

• To provide instructions for building a Docker image

Which base image is used for creating the custom Docker image in this tutorial?

• Ruby

• Python

• Java

• Node.js

Why is it recommended to create a separate folder for application files inside the Docker image?

• To make the image smaller

• To follow best practices and avoid cluttering the root

• To increase application speed

• To reduce memory usage

What port is exposed for the Flask web server in the Dockerfile?

• 3000

• 5050

• 5000

• 8080

Which tool is used to install Python dependencies inside the Docker image?

• yarn

• gradle

• pip

• npm

What is the purpose of the requirements.txt file in the Docker image?

• To configure the network settings

• To list all development tools

• To list all project dependencies

• To specify the Docker version

Why is there no need to create a Python virtual environment inside the Docker container?

• It increases the image size

• The container runs only a single application

• It is too complex to set up

• It is not supported by Docker

What command is used to start the Flask application inside the Docker container?

• npm start

• flask run

• java -jar app.jar

• python main.py

What is the role of the CMD instruction in the Dockerfile?

• To run a command when the container starts

• To expose ports

• To specify the base image

• To build the Docker image

How many steps are there in the Dockerfile as summarized in the tutorial?

• Eight

• Seven

• Six

• Five