Even if there are no other services, this container will remain open after it is created. /即使没有任何服务，本容器创建以后也会保持开启状态。
docker run -d \
--name alpine \
nevinee/alpine-s6
Then enter the container, you can do anything you want to do. /然后进入容器，你可以做任何你想做的事情。
docker exec -it alpine bash