There are two questions here:
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How to shut the system down cleanly
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How to handle certain signals (interrupt)
To answer 1, System.stop/1 is the answer. If terminate/2 callbacks are not invoked, make sure those processes are trapping exits.
To answer 2, since Erlang/OTP 20, there is OS signal handling: http://erlang.org/doc/man/kernel_app.html#os-signal-event-handler
It is a bit of a long answer. In a nutshell, you need to implement a gen_event handler and react to the callbacks you are interested. There is a more detailed guide here: https://medium.com/@ellispritchard/graceful-shutdown-on-kubernetes-with-signals-erlang-otp-20-a22325e8ae98
