kamal
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
service: myapp
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