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The hook is run before the environment is loaded or the config is parsed. This makes it a bit of a special case - it doesn't have the usual KAMAL_XYZ environment variables, as we haven't parsed the config. The use case for this is to do auth checking or setup. So for example we can confirm you are logged in to a secret manager, and then you can directly call it to load your secrets in the .kamal/.env file using .dotenv's [command substitution](https://github.com/bkeepers/dotenv?tab=readme-ov-file#command-substitution).
Kamal: Deploy web apps anywhere
From bare metal to cloud VMs, deploy web apps anywhere with zero downtime. Kamal has the dynamic reverse-proxy Traefik hold requests while a new app container is started and the old one is stopped. Works seamlessly across multiple hosts, using SSHKit to execute commands. Originally built for Rails apps, Kamal will work with any type of web app that can be containerized with Docker.
➡️ See kamal-deploy.org for documentation on installation, configuration, and commands.
Contributing to the documentation
Please help us improve Kamal's documentation on the the basecamp/kamal-site repository.
License
Kamal is released under the MIT License.