Docker如何在macOS主机下运行Linux内核? [英] How does Docker run a Linux kernel under macOS host?

问题描述

我如下所示在我的macOS Sierra上安装了Docker.注意我没有安装VirtualBox.

I installed Docker on my macOS Sierra as follows. Note I don't have VirtualBox installed.

brew cask uninstall virtualbox
brew cask install docker

我的macOS详细信息.

My macOS details.

$ uname -a
Darwin m-C02QG7TRG8WN.local 16.5.0 Darwin Kernel Version 16.5.0: Fri Mar  3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64 x86_64

$ docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Tue Mar 28 00:40:02 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.03.1-ce
 API version:  1.27 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Fri Mar 24 00:00:50 2017
 OS/Arch:      linux/amd64
 Experimental: true

一旦我从启动板运行Docker，就能够运行Docker容器.

Once I run Docker from launchpad, I am able to run Docker containers.

$ docker run -it ubuntu
root@2351d4222a4e:/# uname -a
Linux 2351d4222a4e 4.9.13-moby #1 SMP Sat Mar 25 02:48:44 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

我的问题是Docker如何在macOS中运行Linux内核?我认为Docker至少需要运行boot2docker或其他一些类似的Linux内核，以便它可以借助它来创建Ubuntu的文件系统.但是以上输出似乎表明事实并非如此. Linux内核从何而来?

My question is how does Docker manage to run a Linux kernel within macOS? I thought Docker would at least require boot2docker or some other such Linux kernel running so that it can create the Ubuntu's filesystem with the help of it. But the above output seems to indicate that it is not so. Where does the Linux kernel come from then?

推荐答案

虽然其他有关虚拟机管理程序的答案是正确的，但它们并未回答您的特定问题.

While the other answers are correct about the hypervisor, they don't answer your specific question.

答案是适用于Mac的Docker [Desktop]"运行Linux主机VM，并替换了boot2docker-由Docker开发和维护的 LinuxKit ，目的是进行轻量级发行.

The answer is "Docker [Desktop] for Mac" does run a Linux host VM with a replacement for boot2docker - LinuxKit developed and maintained by Docker for the purpose of making lightweight distributions.

https://blog.docker.com/2017/04/introducing-linuxkit-container-os-toolkit/

您看到的uname中没有关键字，但现在似乎已包含该关键字，例如从Docker for Mac 18.03.1中可以看到:

The uname you saw didn't have the keyword in it, but it seems to be included now, e.g. from Docker for Mac 18.03.1 I see:

Linux a8e079429a51 4.9.87-linuxkit-aufs #1 SMP Wed Mar 14 15:12:16 UTC 2018 x86_64 Linux

您可以在发行页面上看到包含版本的链接. https://docs.docker.com/docker-for-mac/release-笔记/

You can see links to the included versions on the release pages. https://docs.docker.com/docker-for-mac/release-notes/

因此与过去天Docker Machine + VirtualBox + boot2docker，

在新的日子里， provisioning is done internally通过"Docker [Desktop] for Mac" and VirtualBox is replaced by Apple's Hyperkit， 和the "default VM" is a bit more tucked away.

for the new days, it's just the provisioning is done internally by "Docker [Desktop] for Mac" and VirtualBox is replaced by Apple's Hyperkit, and the "default VM" is a bit more tucked away.

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