Hosting multiple sites on 1GB RAM server causes memory exhaustion

Running 25 sites with 566 MB total Gunicorn memory usage plus Nginx (8 MB), Celery (23 MB), and other processes on a 1024 MB RAM server results in near 100% memory utilization (906 MB used, 87 MB free) and heavy swapping (828 MB swapped).

Calculate total memory requirements for all services (Gunicorn workers across all sites + Nginx + Celery + Redis + buffers/cache). Ensure total usage stays below 70-80% of available RAM to avoid swapping. With limited RAM, reduce sites per server to 1-2, or distribute across multiple servers. Even single-worker Gunicorn processes require significant RAM per site.