Working with Docker

Steps

1. Connect to github

git init
git remote add origin https://github.com/45825243/Docker_training.git
git add .
git commit -m "changes"
git push origin master 

we make sure we have connection to our git repo.

2. Create venv with command

python -m venv venv

After that to activate our venv we need to give access for this environment

Set-ExecutionPolicy RemoteSigned -Scope Process

Now we can activate our venv

venv\Scripts\Activate.ps1

Now we are in our virtual environment and it's look like this

3. Install required packages and set up our project

pip install flask

After installing Flask, freeze the installed packages into requirements.txt by running pip freeze > requirements.txt. Now we need to create a new folder called web-app, go into this folder, create thi file app.py, for this we use steps:

mkdir web-app
cd web-app
type nul > app.py

We created a file in the web-app folder called app.py and now we need to paste code onto this file. Use command

code app.py

to open the file and paste the code inside

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=80)

now we test our file with

python app.py

Your command line give you a choice which link to open

After you open the link you can see browser and "Hello, World!". It means your code is working. Click CTRL+C to go back to venv But we need to run the same from the Docker container.

4. Docker

In the same folder create Dockerfile and open it.

type nul > Dockerfile

Paste the code

# Use an official Python runtime as a parent image
FROM python:3.8-slim

# Set the working directory in the container
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"]

Run the command docker build . And don't forget to run docker desktop before this