FWIW, part of the design difference is that rocket doesn't implement an API. When you do `rkt run` it is actually executing under that PID hierarchy; there is no rktd that forks the process.
This is a design goal so that you can launch a container under the control of your init system or other process management system.
This is a design goal so that you can launch a container under the control of your init system or other process management system.