Docker Build Image from Dockerfile

Introduction

Welcome to the future spaceport, a bustling hub of intergalactic travel. As a stellar communications officer, your mission is to ensure that all spacecraft are equipped with the necessary software and configurations as they prepare for their cosmic voyages. In this lab, you will learn how to use Docker to build custom images from Dockerfiles, ensuring that the spacecraft are equipped with the required software packages and configurations for their interstellar journeys.

Skills Graph

Creating a Dockerfile

In this step, you will create a Dockerfile to define the environment for a spacecraft's software system.

1. Create a new file named Dockerfile in the ~/project directory.
2. Add the following content to the Dockerfile:

## Use an official Python runtime as the base image
FROM python:3.9-slim

## Set the working directory
WORKDIR /app

## Copy the current directory contents into the container at /app
COPY . /app

## Install any needed packages specified in requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

## Make port 80 available to the world outside this container
EXPOSE 80

## Define environment variable
ENV NAME World

## Run app.py when the container launches
CMD ["python", "app.py"]

3. Create a requirements.txt file in the ~/project directory. Add the necessary Python packages required by the spacecraft's software.

Building the Docker Image

In this step, you will use the Dockerfile to build a custom Docker image for the spacecraft's software system.

1. Open a terminal and navigate to the ~/project directory.
2. Run the following command to build the Docker image:

docker build -t spaceship-software .

3. Verify that the Docker image has been successfully built and tagged as spaceship-software.

Summary

In this lab, you have learned the process of creating a Dockerfile to define the environment for a spacecraft's software system and building a custom Docker image based on the Dockerfile. By following these steps, you have gained the essential skills to prepare software configurations for space missions using Docker.