问题
I understand that a container will exit when the main process exit. My question is about the reason behind it, not how to get it to work. I of course know that I could pass the parameter -it to start with interactive mode.
The Ubuntu image will run /bin/bash when it starts according to the image Dockerfile. Shouldn't bash process wait for user input commands and not exit? (just like when you run /bin/bash in the host machine, it would start an interactive shell and wait for user inputs and not exit) Why would the Docker Ubuntu's bash exit right away?
回答1:
Without -it the container has no TTY, and no stdin attached, so bash starts and completes directly after.
You can keep the container running by adding the -d option (so docker run -dit ubuntu) to start it in detached mode
来源：https://stackoverflow.com/questions/37599263/whats-the-reason-docker-ubuntu-official-image-would-exit-immediately-when-you-r