A switch that is designed to be activated or deactivated if the human operator becomes incapacitated.
As said on deadman.io:
Deadman is a service that will contact you by phone, email, or text-message to make sure everything is OK. If you don't respond, Deadman will email, call, or text any number of people that you define and send them documents, photos, or any other electronic file.
You must have a file named mail_parameters.json at the root of the server.
You can find an explanation in parameters_howto and an example in mail_parameters.json.
docker build -t dms .
docker run -d dms