Kamal Deployment

Kamal is a zero-downtime deployment tool for containerized applications, built by 37signals. It combines SSH, Docker, and Kamal Proxy to deploy any containerized web app to bare Linux servers.

Key components: SSH/SSHKit (remote execution), Docker (containers), Kamal Proxy (zero-downtime routing), Accessories (supporting services).

Quick Start

gem install kamal
cd your-app && kamal init          # Generate config/deploy.yml and .kamal/secrets
# Edit config/deploy.yml and .kamal/secrets
kamal setup                         # Bootstrap servers, install Docker, deploy

Minimal deploy.yml