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# connect to tty on Docker for Mac VM
screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty

# disconnect that session but leave it open in background
Ctrl-a d

# list that session that's still running in background
screen -ls

# reconnect to that session (don't open a new one, that won't work and 2nd tty will give you garbled screen)
screen -r

# kill this session (window) and exit
Ctrl-a k

# other option to connect w/o screen
docker run -it --privileged --pid=host debian nsenter -t 1 -m -u -n -i sh
# Phil Estes says this does:
# it’s running a container (using the debian image..nothing special about it other than it apparently has `nsenter` installed)
# , with pid=host (so you are in the process space of the mini VM running Docker4Mac), and then nsenter says “whatever is pid 1, 
# use that as context, and enter all the namespaces of that, and run a shell there"

# from Justin Cormack
# Personally I mostly use screen, but then I also use 
docker run --privileged --pid=host justincormack/nsenter1
# too. That's my minimal nsenter image