Rails Deployment Memory Showdown: Docker vs Traditional

When deploying multiple Ruby on Rails applications, choosing between containerized (Docker/Kamal) and traditional (Nginx/Passenger) deployment strategies can significantly impact your server resource requirements. Let's break down the real memory footprint of each approach. The Contenders We'll compare three deployment strategies for hosting multiple Rails apps with SQLite3 on a single server: Docker + Kamal - Modern containerized deployment Traditional (Capistrano + Nginx + Puma) - Separate processes per app Traditional (Nginx + Passenger) - Copy-on-Write optimization .