The host environment you're running Docker in still needs a services to be execu...

adtac · on March 13, 2019

I just ran `docker run -it alpine /bin/sh` and when inside, I ran top. It looks like `/bin/sh` ran as PID 1. No init, just sh (busybox in this case).

Edit: Ah you meant the host OS. I can't reply to wezm down below for whatever reason (there's no "reply" button), so I'll just edit this to say I didn't realise that he was using alpine as your host OS as well. I haven't seen many people running it outside Docker, so it's quite interesting.

krferriter · on March 13, 2019

There's no init and only one process by default in alpine's docker image but you can add them and run more processes if you want.

Scarbutt · on March 13, 2019

He means the host OS.

adtac · on March 13, 2019

Host operating systems need a init, of course. I was just startled by the irrelevant discussion on alpine's init system when it isn't involved anywhere.

wezm · on March 13, 2019

Yeah my host is running Alpine as well the containers so it's init needs to start docker, cron, etc.