Example kamal deploy.yml file for a standard Rails setup on Digital Ocean

deploy.yml

# Name of your application. Used to uniquely configure containers.
service: your-app-name

# Name of the container image.
image: your-org/your-app-name

# Deploy to these servers.
servers:
  web: 
    - REPLACE_WITH_YOUR_WEB_DROPLET_IP
  job: 
    hosts: 
      - REPLACE_WITH_YOUR_JOB_DROPLET_IP
    cmd: bundle exec rake solid_queue:start 

# Credentials for your image host.
registry:
  # Specify the registry server, if you're not using Docker Hub
  server: registry.digitalocean.com/name-of-your-registry
  username: your-do-email

  # Always use an access token rather than real password when possible.
  password:
    - KAMAL_REGISTRY_PASSWORD

# Inject ENV variables into containers (secrets come from .env).
# Remember to run `kamal env push` after making changes!
env:
  secret:
    - RAILS_MASTER_KEY
    - DATABASE_URL