Community Questions
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How to read and write JSON files in Python
What is the best way to read JSON data from a file and write JSON to a file in Python?
How to change hostname on Linux
I need to change my server hostname. What is the correct way to do this on modern Linux systems?
How to compress and extract tar.gz files on Linux
How do I create and extract .tar.gz archives on Linux from the command line?
How to fix "too many open files" error on Linux
My application crashes with "too many open files" error. How can I increase the file descriptor limit?
How to set up UFW firewall on Ubuntu
I want to secure my Ubuntu server with a firewall. How do I configure UFW to allow only SSH and HTTP/HTTPS?
How to schedule tasks with cron on Linux
I need to run a backup script every night at 2 AM. How do I set up a cron job?
How to monitor system resources in real-time on Linux
What are the best tools to monitor CPU, memory, and disk usage in real-time on a Linux server?
How to add swap space on Linux
My server is running out of memory. How can I add swap space without reinstalling the system?
How to set up automatic security updates on Ubuntu
I want my Ubuntu server to automatically install security updates. How do I configure unattended-upgrades?
How to check disk usage and find large files on Linux
My server disk is getting full. How can I find which files and directories are taking up the most space?
How to find and kill a process using a specific port
I need to free up port 8000 but something is already using it. How can I find what process is using it and kill it?
CORS errors in Django REST API - complete fix
I'm getting CORS errors when my frontend tries to access my Django REST API. "Access-Control-Allow-Origin" header is missing.
How to optimize Django ORM queries for better performance
My Django application is slow. Database queries are taking forever. How can I optimize my ORM queries?
PostgreSQL connection refused in Django - solutions
My Django app cannot connect to PostgreSQL. I get "connection refused" error. PostgreSQL is installed and running.
502 Bad Gateway with Nginx and Gunicorn - how to fix
I'm getting 502 Bad Gateway error when accessing my Django site through Nginx. Gunicorn seems to be running. How do I fix this?
Django migrations not applying - troubleshooting guide
I made changes to my models but migrations are not being applied. makemigrations shows "No changes detected". What's wrong?
pip install failing with SSL certificate error
When I try pip install, I get SSL: CERTIFICATE_VERIFY_FAILED error. How can I fix this?
How to handle Unicode encoding errors in Python
I'm getting UnicodeDecodeError when reading files or processing text. How do I properly handle encoding in Python?
Python virtual environment not activating - solutions
When I try to activate my virtual environment with "source venv/bin/activate", nothing happens. No error, but the prompt doesn't change.
How to fix ModuleNotFoundError: No module named in Python
I installed a package with pip but Python says "ModuleNotFoundError: No module named". I've tried reinstalling but it still doesn't work.