基本Docker容器报告运行级别未知 [英] Basic Docker container reports runlevel unknown

问题描述

当我运行一个基本的Docker容器（来自Google Cloud Shell）时，如此

When I run a basic Docker container (from within Google Cloud Shell) like so

docker pull debian
docker run -i -t debian:wheezy /bin/bash

然后键入 runlevel 在运行容器的shell提示符下，运行级别为 unknown 。我应该安装（ apt-get ）特定的包，以增加对运行级别的支持。如果是这样，哪些还有什么可能是错的？

and then type runlevel at the running container's shell prompt, the run level is unknown. Am I supposed to install (apt-get) particular packages in order to add support for run levels. If so, which ones, or what else could be wrong?

推荐答案

Docker是一个应用程序隔离工具，而不是一个操作系统虚拟化工具。运行级别在操作系统级别，操作系统出现，挂载目录，并启动服务以实现运行级别。在容器中，您的应用程序启动，结束。您可以假定容器处于单一用户运行级别，因为您是访问环境的唯一用户，但安装应用程序确实不重要。

Docker is an application isolation tool, not an OS virtualization tool. Runlevel's are at the OS level, the OS comes up, mounts directories, and starts services to achieve a runlevel. In a container, your application is launched, the end. You can assume the container is at a single user run level, since you're the only user accessing the environment, but it really shouldn't matter for installing applications.

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