In version 5.0 the authors of the popular Ruby web server Puma chose to remove the daemonization support from Puma, because the code wasn't wall maintained, and because other and perhaps better options exist (such as systemd, etc), not to mention many people have switched to Kubernetes and Docker, where you want to start all servers on the foreground. And yet, something useful and simple got lost — in our humble opinion. Some folks were indeed happily using the `--daemonize` feature until in 5.0 they got an error that this flag is not supported. So, if you want to use the latest and greatest Puma 5+, but have it self-daemonize, this gem is for you. Just use *pumad* binary instead of *puma*, or require 'puma/daemon' inside your config file.