自2014年提出这个问题以来，发生了许多情况，许多事情发生了变化。今天我再次讨论这个话题，这是我第12次编辑这个问题，以反映最新的变化。这个问题可能看起来很长，但它是按倒序排列的，所以最新的变化在顶部，你可以随时停止阅读。

我想解决的问题是——如何在构建过程中将主机卷挂载到Dockerfile中的docker容器中，即在docker构建过程中让docker运行-v /export:/export功能。

对我来说，这背后的一个原因是，当在Docker中构建东西时，我不希望那些(apt-get install)缓存被锁定在单个Docker中，而是共享/重用它们。

这就是我问这个问题的主要原因。我今天面临的另一个原因是试图利用来自主机的巨大私有回购，否则我必须使用我的私有ssh密钥从docker中的私有回购中做git克隆，我不知道如何，也没有研究过。

最新更新:

@BMitch回答中的Buildkit

使用RUN——mount语法，你还可以从build-context…

它现在已经内置在docker(我认为是第三方工具)中，只要你的版本超过18.09。我的现在是20.10.7 https://docs.docker.com/develop/develop-images/build_enhancements/

要启用BuildKit构建 重新安装docker最简单的方法是在调用docker build命令时设置DOCKER_BUILDKIT=1环境变量，例如: $ DOCKER_BUILDKIT=1个docker build。

否则，你会得到:

——mount选项需要BuildKit。参考https://docs.docker.com/go/buildkit/了解如何在启用BuildKit的情况下构建图像

因此，它将是我上面解释的第二个用例的完美解决方案。

截至2019年5月7日更新:

在docker v18.09之前，正确的答案应该是以:

有一种方法可以在构建期间挂载卷，但它不涉及Dockerfiles。

然而，这是一个陈述不当、组织不当和支持不足的回答。当我重新安装我的docker contains时，我碰巧发现了以下文章:

Dockerize apt-cache -ng服务 https://docs.docker.com/engine/examples/apt-cacher-ng/

这是码头工人对这个/我的问题的解决方案，不是直接的，而是间接的。这是docker建议我们做的正统方法。我承认这比我在这里想问的要好。

另一种方法是，新接受的答案，例如，v18.09中的Buildkit。

挑一个适合你的。

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Was:曾经有一个解决方案- rocker，这不是来自Docker，但现在rocker已经停止，我将答案再次回复为“不可能”。

---

Old Update: So the answer is "Not possible". I can accept it as an answer as I know the issue has been extensively discussed at https://github.com/docker/docker/issues/3156. I can understand that portability is a paramount issue for docker developer; but as a docker user, I have to say I'm very disappointed about this missing feature. Let me close my argument with a quote from aforementioned discussion: "I would like to use Gentoo as a base image but definitely don't want > 1GB of Portage tree data to be in any of the layers once the image has been built. You could have some nice a compact containers if it wasn't for the gigantic portage tree having to appear in the image during the install." Yes, I can use wget or curl to download whatever I need, but the fact that merely a portability consideration is now forcing me to download > 1GB of Portage tree each time I build a Gentoo base image is neither efficient nor user friendly. Further more, the package repository WILL ALWAYS be under /usr/portage, thus ALWAYS PORTABLE under Gentoo. Again, I respect the decision, but please allow me expressing my disappointment as well in the mean time. Thanks.

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原问题详情:

From

通过卷共享目录 http://docker.readthedocs.org/en/v0.7.3/use/working_with_volumes/

它说数据卷功能“从Docker远程API的版本1开始就可以使用”。我的docker是1.2.0版本，但我发现上面文章中给出的例子不起作用:

# BUILD-USING:        docker build -t data .
# RUN-USING:          docker run -name DATA data
FROM          busybox
VOLUME        ["/var/volume1", "/var/volume2"]
CMD           ["/usr/bin/true"]

在Dockerfile中，通过VOLUME命令将主机挂载的卷装入docker容器的正确方法是什么?

$ apt-cache policy lxc-docker
lxc-docker:
  Installed: 1.2.0
  Candidate: 1.2.0
  Version table:
 *** 1.2.0 0
        500 https://get.docker.io/ubuntu/ docker/main amd64 Packages
        100 /var/lib/dpkg/status

$ cat Dockerfile 
FROM          debian:sid

VOLUME        ["/export"]
RUN ls -l /export
CMD ls -l /export

$ docker build -t data .
Sending build context to Docker daemon  2.56 kB
Sending build context to Docker daemon 
Step 0 : FROM          debian:sid
 ---> 77e97a48ce6a
Step 1 : VOLUME        ["/export"]
 ---> Using cache
 ---> 59b69b65a074
Step 2 : RUN ls -l /export
 ---> Running in df43c78d74be
total 0
 ---> 9d29a6eb263f
Removing intermediate container df43c78d74be
Step 3 : CMD ls -l /export
 ---> Running in 8e4916d3e390
 ---> d6e7e1c52551
Removing intermediate container 8e4916d3e390
Successfully built d6e7e1c52551

$ docker run data
total 0

$ ls -l /export | wc 
     20     162    1131

$ docker -v
Docker version 1.2.0, build fa7b24f

echo 'WARMACHINEROX' > mysecret.txt
docker build --secret id=mysecret,src=mysecret.txt .

# syntax = docker/dockerfile:1.0-experimental
FROM alpine

# shows secret from default secret location:
RUN --mount=type=secret,id=mysecret cat /run/secrets/mysecret

# shows secret from custom secret location:
RUN --mount=type=secret,id=mysecret,dst=/foobar cat /foobar

host=%COMPUTERNAME%
set domainAndUser=whoami
set "pswd=<host-password>"
set "shareName=tmpSmbShare"
set netPath=\\%COMPUTERNAME%\%shareName%
set "localPath=C:/Users/tester/Desktop/docker/Java11/winsrvcore/installers"

powershell New-SmbShare -Name %shareName% -Path %localPath% -FullAccess "Everyone"
docker build ^
--build-arg domainAndUser=%domainAndUser% ^
--build-arg pswd=%pswd% ^
--build-arg netPath=%netPath% ^
-t <docker-username>/java-11.0.16-winsrvcore.ltsc2019:1.0 .
powershell Remove-SmbShare -Name %shareName% -Force

FROM mcr.microsoft.com/windows/servercore:ltsc2019-amd64

ARG domainAndUser
ARG pswd
ARG netPath

RUN powershell New-SMBMapping -LocalPath "R:" -RemotePath "$env:netPath" -UserName "$env:domainAndUser" -Password "$env:pswd" \
    && dir "R:/" \
    && copy "R:/jdk-11.0.16_windows-x64_bin.exe" "C:/" \
    && powershell Start-Process -filepath 'C:/jdk-11.0.16_windows-x64_bin.exe' -Wait -PassThru -ArgumentList "/s,/L,install64.log" \
    && powershell Remove-SMBMapping -LocalPath "R:" -Force \
    && del "C:/jdk-11.0.16_windows-x64_bin.exe" 

ENV JAVA_HOME "C:\Program Files\Java\jdk-11.0.16"

echo 'WARMACHINEROX' > mysecret.txt
docker build --secret id=mysecret,src=mysecret.txt .

# syntax = docker/dockerfile:1.0-experimental
FROM alpine

# shows secret from default secret location:
RUN --mount=type=secret,id=mysecret cat /run/secrets/mysecret

# shows secret from custom secret location:
RUN --mount=type=secret,id=mysecret,dst=/foobar cat /foobar

FROM foo
COPY ./m2/ /root/.m2
RUN stuff

docker build . -t barImage
container="$(docker run -d barImage)"
rm -rf ./m2
docker cp "$container:/root/.m2" ./m2
docker rm -f "$container"

$ docker inspect --format "{{ .Volumes }}" <ID>
map[/export:/var/lib/docker/vfs/dir/<VOLUME ID...>]

docker run -v /export:/export data