Day 09 || Writing a Flask App Dockerfile Project

Introduction:

In this tutorial, we will work with the "flask-blog-app" repository hosted on GitHub. We will clone the repository, set up a Flask app, write a Dockerfile, and push the image to Docker Hub.

Step 1: Clone the GitHub Repository

1. Open your terminal.

2. Navigate to the directory where you want to clone the repository.

3. Run the following command to clone the "flask-blog-app" repository:

    git clone https://github.com/gibran-abdillah/flask-blog-app.git
   

Step 2: Set Up the Flask App

Certainly, I can provide instructions for working with the GitHub repository you've linked. Here are the steps to work with the "flask-blog-app" repository:

Title: Working with the Flask Blog App Repository

Introduction:

In this tutorial, we will work with the "flask-blog-app" repository hosted on GitHub. We will clone the repository, set up a Flask app, write a Dockerfile, and push the Docker image to Docker Hub.

Step 1: Clone the GitHub Repository

1. Open your terminal.

2. Navigate to the directory where you want to clone the repository.

3. Run the following command to clone the "flask-blog-app" repository:

    git clone https://github.com/gibran-abdillah/flask-blog-app.git
   

Step 2: Set Up the Flask App

1. Navigate to the cloned "flask-blog-app" directory:

    cd flask-blog-app
   

2. Install the Flask app's dependencies by running:

    pip install -r requirements.txt
   

3. Set Flask environment variables:

    export FLASK_APP=server.py
    export FLASK_ENV=development
   

4. Run the Flask app locally:

    flask run
   

   This will start your Flask app locally, and you can access it in your web browser at http://127.0.0.1:5000/.

Step 3: Write a Dockerfile

1. Create a Dockerfile in the "flask-blog-app" directory. You can use a text editor to create a file named Dockerfile with the following content (as mentioned earlier):

    # Use an official Python runtime as a parent image
    FROM python:3.10
   
    # Set the working directory to /app
    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 -r requirements.txt
   
    # Make port 5000 available to the world outside this container
    EXPOSE 5000
   
    # Define environment variable for Flask (optional, but recommended)
    ENV FLASK_APP=server.py
    ENV FLASK_ENV=production
   
    # Run Flask when the container launches
    CMD ["flask", "run", "--host=0.0.0.0"]
   

Step 4: Build the Docker Image

1. In the "flask-blog-app" directory, build the Docker image with the following command:

    docker build -t flask-blog-app .
   

   This will create a Docker image named "flask-blog-app."

   Step 5: Run a Docker Container

   1. Run a Docker container from the image with the following command, mapping port 5000 inside the container to a port on your local machine (e.g., 5000):

       docker run -p 5000:5000 flask-blog-app
      

      This command runs the container and maps port 5000 on your machine to port 5000 inside the container.

   2. Open your web browser and access the Flask app at http://127.0.0.1:5000/. You should see your Flask app running inside the Docker container.

Step 6: Configure Security Groups (AWS EC2 or VM)

If you are running this on AWS EC2 or a virtual machine, you may need to configure security groups to allow traffic on port 5000:

• If using AWS EC2:

  1. Log in to the AWS Management Console.

  2. Navigate to the EC2 dashboard.

  3. Select your EC2 instance.

  4. In the "Security groups" tab, edit the security group associated with your instance.

  5. Add an inbound rule that allows traffic on port 5000 (TCP) from your desired source IP addresses or IP range.

  6. Save the changes.

• If using a virtual machine:

  1. Access your virtual machine provider's dashboard or control panel.

  2. Navigate to your virtual machine settings.

  3. Add a rule in the firewall settings to allow incoming traffic on port 5000 (TCP).

  4. Save the changes.

Step 5: Push the Docker Image to Docker Hub

1. Make sure you are logged in to Docker Hub using the docker login command if you're not already logged in.

2. Tag the Docker image with your Docker Hub username and repository name:

    docker tag flask-blog-app yourusername/flask-blog-app
   

   Replace yourusername with your Docker Hub username.

3. Push the Docker image to Docker Hub:

    docker push yourusername/flask-blog-app
   

Conclusion:

You have successfully cloned the "flask-blog-app" repository, set up a Flask app locally, wrote a Dockerfile for the app, and pushed the Docker image to Docker Hub. Now others can easily run your Flask app in a Docker container.

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