Kamal Quick Commands

1 min

Here are some commonly used Kamal commands that I find helpful during development and deployment.

Application Commands

  • kamal app logs -f -r web
    • Tail web application logs in real-time
  • kamal app exec -p 'bin/rails runner "puts Rails.application.config.time_zone"'
    • Execute a command on the Rails server
  • kamal app exec -i bash
    • Start an interactive bash session on the app server
  • kamal app exec -i 'bin/rails console'
    • Start a Rails console on the app server

Important Notes

  • Changes must be committed to git before deploying, as Kamal only picks up committed files
  • Docker must be installed manually on AWS EC2 instances
  • Ensure your Dockerfile is present and up to date

AWS EC2 Connectivity Commands

  • nc -vz <ip_address> 22
    • Check SSH connectivity to the server
  • ssh -vvv ubuntu@<public_ip>
    • Connect to the EC2 instance with verbose output for debugging

For complete guides to deploying Rails with Kamal, see:

Kamal, kamal, Rails, Ruby, ruby on rails, RubyOnRails
This post is licensed under CC BY 4.0 by the author.