from
docker run -t -i → can be detached with ^P^Q and reattached with docker attach
docker run -i → cannot be detached with ^P^Q; will disrupt stdin
docker run → cannot be detached with ^P^Q; can SIGKILL client; can reattach with docker attach
所以不要在用docker run -d了，要用-it,通过 ^P^Q 退出（保持后台）和再连接。