# config/deploy.yml -weight: 500;">service: my-app image: my-app servers: web: hosts: - 1.2.3.4 worker: hosts: - 1.2.3.4 cmd: bin/jobs registry: username: myuser password: - KAMAL_REGISTRY_PASSWORD env: secret: - DATABASE_URL - REDIS_URL # config/deploy.yml -weight: 500;">service: my-app image: my-app servers: web: hosts: - 1.2.3.4 worker: hosts: - 1.2.3.4 cmd: bin/jobs registry: username: myuser password: - KAMAL_REGISTRY_PASSWORD env: secret: - DATABASE_URL - REDIS_URL # config/deploy.yml -weight: 500;">service: my-app image: my-app servers: web: hosts: - 1.2.3.4 worker: hosts: - 1.2.3.4 cmd: bin/jobs registry: username: myuser password: - KAMAL_REGISTRY_PASSWORD env: secret: - DATABASE_URL - REDIS_URL kamal setup # First time: -weight: 500;">install Docker, Traefik, deploy kamal deploy # Subsequent: build, push, deploy with zero downtime kamal rollback # Something wrong? Roll back in 10 seconds kamal setup # First time: -weight: 500;">install Docker, Traefik, deploy kamal deploy # Subsequent: build, push, deploy with zero downtime kamal rollback # Something wrong? Roll back in 10 seconds kamal setup # First time: -weight: 500;">install Docker, Traefik, deploy kamal deploy # Subsequent: build, push, deploy with zero downtime kamal rollback # Something wrong? Roll back in 10 seconds gem -weight: 500;">install kamal kamal init kamal setup gem -weight: 500;">install kamal kamal init kamal setup gem -weight: 500;">install kamal kamal init kamal setup - You have a server with Docker installed - Kamal builds your Docker image - Kamal deploys it via SSH - Traefik handles routing and SSL - Zero downtime — old container runs until new one is healthy - Zero-downtime deploys (health checks, rolling -weight: 500;">restart) - Automatic SSL via Traefik + Let's Encrypt - Multi-server deploys from one config - Accessory services: deploy Redis, PostgreSQL alongside your app - Rolling deploys: -weight: 500;">update servers one at a time - Audit trail: kamal audit shows deploy history - Small to medium apps that need reliable deployment - Teams that know Docker but do not want Kubernetes - Rails apps (Kamal was built for Rails at Basecamp/HEY) - Any Dockerized app on any server - Need a UI: Use Coolify instead - Large scale: 50+ services → consider Kubernetes - Zero ops: Use Vercel/Railway