Ubuntu Lightsail: Cloning private GitHub repository using a personal access token (PAT) while migrating a Flask application from Codespace to AWS Lightsail

[Splendid Digital Solutions]

https://repost.aws/questions/QUU5EHA-pdR3yykEPMilcbVg/ubuntu-lightsail-cloning-private-github-repository-using-a-personal-access-token-pat

How to Migrate a Flask Application from Codespaces to AWS Lightsail: A Step-by-Step Guide

Source: Generated taking help of ChatGPT

Title: How to Migrate a Flask Application from Codespaces to AWS Lightsail: A Step-by-Step Guide

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Introduction

Migrating a Flask application from GitHub Codespaces to an AWS Lightsail Ubuntu instance can streamline your development and deployment processes. This guide will walk you through the steps needed to transfer your Flask app to an AWS Lightsail instance, ensuring that you can easily access and manage your application in a cloud environment.

Prerequisites

• AWS Account: Make sure you have an AWS account.
• AWS Lightsail Instance: An Ubuntu instance set up and running on AWS Lightsail.
• Flask Application: Your Flask application code, which you want to migrate.
• GitHub Account: To access your code repository on GitHub.

Step-by-Step Migration Guide

1. Prepare Your AWS Lightsail Instance

1. Log in to AWS Lightsail:

– Go to the AWS Lightsail console.
– Sign in with your AWS credentials.

1. Create a New Ubuntu Instance:

– Click on Create instance.
– Choose the Ubuntu blueprint.
– Select an instance plan that fits your needs.
– Create and name your instance.

1. Access Your Lightsail Instance:

– Once your instance is running, click Connect to access it via SSH in the Lightsail console.

2. Set Up Your Environment on Lightsail

1. Update and Upgrade Packages:

sudo apt update
sudo apt upgrade

1. Install Python and Pip:

sudo apt install python3 python3-pip

1. Install Virtualenv:

sudo pip3 install virtualenv

1. Create a Virtual Environment:

mkdir ~/myflaskapp
cd ~/myflaskapp
virtualenv venv
source venv/bin/activate

3. Transfer Your Flask Application Code

1. Clone Your Repository from GitHub:

– Ensure git is installed:

sudo apt install git

• Clone your Flask application repository:

git clone https://github.com/yourusername/yourrepository.git
cd yourrepository

1. Install Required Packages:

– If you have a requirements.txt file in your repository, install dependencies:

pip install -r requirements.txt

4. Configure and Run Your Flask Application

1. Set Up Flask Application:

– Ensure that your Flask app file (e.g., app.py) is in the repository and correctly configured.

1. Run Flask Application:

– Run the application:

flask run --host=0.0.0.0

• Your Flask app should now be accessible on port 5000.

5. Open Port 5000 on Lightsail

1. Modify Firewall Rules:

– Go to the Lightsail console.
– Click on the Networking tab for your instance.
– Under Firewall, click Add another.
– Allow traffic on port 5000:
– Application: Custom
– Port range: 5000
– Source type: Anywhere (or specify IP range)

6. Access Your Flask Application

1. Find Your Public IP Address:

– In the Lightsail console, go to your instance’s Networking tab to get your public IP address.

1. Open Your Flask App in a Browser:

– Open a web browser and go to:

http://YOUR_PUBLIC_IP:5000

You should see your Flask application running.

Conclusion

By following these steps, you’ve successfully migrated your Flask application from GitHub Codespaces to an AWS Lightsail Ubuntu instance. You can now manage and scale your application more effectively in the cloud. Keep your application secure and consider using additional tools and configurations for production deployments.

 

Resolving Flask Import Errors and Path Issues After Migration to AWS Lightsail

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Introduction

After migrating a Flask application to an AWS Lightsail instance, you may encounter issues related to missing modules or path configurations. One common issue is an ImportError when Flask cannot find necessary libraries or scripts. This guide provides a step-by-step solution to resolve such issues and ensure your Flask application runs smoothly on AWS Lightsail.

Scenario

You successfully migrated your Flask application to AWS Lightsail and managed to run it once. However, subsequent attempts to run the application result in errors related to missing modules, such as pandas.

Step-by-Step Solution

1. Verify the Current Directory

Ensure you are in the correct directory where your Flask application file (e.g., app.py) is located. Navigate to your project directory:

cd ~/SplendidDigital

2. Set the FLASK_APP Environment Variable

If your Flask application file is named app.py, set the FLASK_APP environment variable to point to it:

export FLASK_APP=app.py

3. Activate Your Virtual Environment

Make sure your virtual environment is activated. If it’s not, activate it:

source venv/bin/activate

4. Install Necessary Packages

Install the required packages using pip. If you encounter warnings about script locations, this indicates that the packages were installed in a directory not included in your PATH. You need to address this to avoid potential issues:

pip install Flask pandas matplotlib requests

Address the PATH Warning:

The warning indicates that installed scripts are in /home/ubuntu/.local/bin, which is not on your PATH. You can resolve this by adding the directory to your PATH:

Temporarily (current session only):

export PATH=$PATH:/home/ubuntu/.local/bin

Permanently:

1. Open your .bashrc file:

nano ~/.bashrc

1. Add this line at the end:

export PATH=$PATH:/home/ubuntu/.local/bin

1. Save and close the file, then reload it:

source ~/.bashrc

5. Run the Flask Application

With the virtual environment activated and FLASK_APP set, run your Flask application:

flask run --host=0.0.0.0

6. Check for Errors

If errors persist, check for the following:

1. Error Messages: Review any additional error messages in the terminal for further clues.

2. Inspect app.py: Ensure your app.py file is correctly configured and located in the current directory.

3. Verify Python Environment: Ensure Flask and other dependencies are installed in your virtual environment. Always activate your virtual environment before running the Flask app.

Conclusion

By following these steps, you should resolve the import errors and path issues encountered after migrating your Flask application to AWS Lightsail. Proper path configuration and virtual environment management are crucial for smooth operation. If you continue to face issues, additional troubleshooting may be required based on specific error messages and configurations.

 

 

 

Article detailing the process of deploying above Flask application on AWS Lightsail with the domain aiannum.uk.

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Deploying a Flask Application on AWS Lightsail with the Domain aiannum.uk

Deploying a web application can seem daunting, but with AWS Lightsail, you can simplify the process and manage your application efficiently. In this article, we’ll walk through the steps to deploy a Flask application on AWS Lightsail and configure it with your custom domain aiannum.uk.

1. Setting Up AWS Lightsail

1. Launch an Instance:

– Log in to your AWS Lightsail account.
– Click on “Create instance.”
– Choose “Linux/Unix” as the platform and select the “Ubuntu” blueprint.
– Select an instance plan based on your needs.
– Name your instance and click “Create instance.”

1. Connect to Your Instance:

– Once your instance is running, click on it and then click the “Connect” tab.
– Use the browser-based SSH client to connect to your instance.

2. Installing and Configuring Nginx

1. Update Your System:

sudo apt update
sudo apt upgrade

1. Install Nginx:

sudo apt install nginx

1. Configure Nginx:

– Create a configuration file for your domain:

sudo nano /etc/nginx/sites-available/aiannum.uk

• Add the following configuration:

server {
listen 80;
server_name aiannum.uk;

location / {
proxy_pass http://127.0.0.1:5000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}

• Enable the configuration:

sudo ln -s /etc/nginx/sites-available/aiannum.uk /etc/nginx/sites-enabled/

1. Test and Reload Nginx:

sudo nginx -t
sudo systemctl reload nginx

3. Deploying Your Flask Application

1. Install Required Packages:

sudo apt install python3-pip python3-venv

1. Set Up Your Flask Application:

– Navigate to your application directory:

cd ~/SplendidDigital

• Create a virtual environment:

python3 -m venv venv
source venv/bin/activate

• Install Flask and Gunicorn:

pip install flask gunicorn

1. Run Gunicorn:

gunicorn --bind 0.0.0.0:5000 app:app

4. Configuring Your Domain

1. Update DNS Settings:

– Go to your domain registrar’s DNS management page.
– Create an A record pointing to your AWS Lightsail instance’s public IP address.

1. Verify Domain Setup:

– Ensure that your domain aiannum.uk is correctly pointing to your instance and that Nginx is serving your Flask application.

5. Troubleshooting

• Nginx 502 Bad Gateway:
• Ensure that Gunicorn is running and bound to the correct port.
• Check the Nginx configuration for any syntax errors or misconfigurations.
• Restart Nginx if necessary:

sudo systemctl restart nginx

• Port Conflicts:
• Ensure that no other processes are using the port you’ve configured for Gunicorn. Use lsof -i :5000 to check port usage.

By following these steps, you’ve successfully deployed your Flask application on AWS Lightsail and configured it with your custom domain aiannum.uk. With Nginx serving as a reverse proxy and Gunicorn handling your Flask application, you now have a robust and scalable setup for your web application.

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