A start-to-finish walkthrough of shipping a Rails 8 app to a single VPS with Kamal 2, using Vite, Solid Queue, PostgreSQL as a Kamal accessory and Docker Hub. It focuses on the errors you will probably hit: a Dockerfile with no Node.js, a database.yml that falls back to localhost, SOLID_QUEUE_IN_PUMA=false turning the Puma plugin on, uncommitted changes that Kamal never builds, and Let’s Encrypt failing on DNS. It ends with what Kamal leaves to you: backups, HA and Postgres major upgrades.

https://rubyinsights.blog/en/blog/deploying-a-rails-8-app-to-a-vps-with-kamal-2-a-practical-guide