SimpleLogViewer

This is a very simple Flask app that outputs the last n lines of a log file to a web page. By default you can choose the last 25, 50, 100, 250, 500, or 1000 lines, but you can easily add other options. Click any of the buttons to update the log or change the length.

There is a basic authentication function to restrict access.

Setup

1. Create a folder for the log viewer
   mkdir /home/user/logviewer

2. CD to the new folder and clone the repo
   cd /home/user/logviewer
git clone https://github.com/blevok/SimpleLogViewer.git

3. Create a virtual environment
   python3 -m venv logviewerenv

4. Activate the virtual environment
   source logviewerenv/bin/activate

5. Install wheel, flask, and gunicorn in the virtual environment
   pip install wheel
pip install gunicorn flask

6. Edit app.py

• Line 18 - set a username and password
• Line 89 - set the path to the log file you want to see on the web page

Usage

1. Run the app with gunicorn. Use a different port if 5000 is already in use
   gunicorn --bind 0.0.0.0:5000 wsgi

2. Go to your-server-ip:5000 in a browser and you should be prompted to login, and then you'll see the log file

3. When you're finished, press Ctrl+C to stop the app

4. Deactivate the virtual environment
   deactivate

If you want to leave the app running after you close the terminal, you can run it in screen.

Next steps

You can setup nginx or other web server to proxy requests and use a domain name.

You can install an SSL certificate to secure the log viewer.

You can add a systemd service file to run the app when the system starts.

Screenshot