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如何让 Docker 写入本地目录？

tag-icon • tag-icon python docker django
如何让 Docker 写入本地目录？

我正在尝试设置 wagtail（django 扩展，http://wagtail.io/) 网站，它似乎已经起作用了，但据我所知，它将网站隐藏在 Docker 内部的某个地方，我实际上无法使用它。

我的目录设置如下：

dir
|- docker-compose.yml
|- web
    |- Dockerfile
    |- requirements.txt

我的 docker-compose.yml

version: '2'
services:
  db:
    restart: always
    image: postgres
  web:
    build: ./web
    command: python3 manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db
    restart: always

我的Dockerfile：

FROM python:3.5
MAINTAINER

RUN apt-get update -y

ENV PYTHONBUFFERED 1

RUN mkdir /code
WORKDIR /code

ADD requirements.txt /code/

RUN pip3 install -r requirements.txt

ADD . /code/

当我运行它时……

$docker-compose run web wagtail start site .
Building web
Step 1 : FROM python:3.5
 ---> 64869b3b2083
Step 2 : MAINTAINER 
 ---> Using cache
 ---> 2a539247021e
Step 3 : RUN apt-get update -y
 ---> Using cache
 ---> 6d1094098071
Step 4 : ENV PYTHONBUFFERED 1
 ---> Using cache
 ---> 12a153c417cd
Step 5 : RUN mkdir /code
 ---> Using cache
 ---> 4cc21041c1c8
Step 6 : WORKDIR /code
 ---> Using cache
 ---> eaca96927442
Step 7 : ADD requirements.txt /code/
 ---> Using cache
 ---> 2f1977d72542
Step 8 : RUN pip3 install -r requirements.txt
 ---> Using cache
 ---> a73e7640aa35
Step 9 : ADD . /code/
 ---> 31bd3c0432cd
Removing intermediate container 66e4fa5b074f
Successfully built 31bd3c0432cd
Creating a wagtail project called site
CommandError: /code/requirements.txt already exists, overlaying a project or app into an existing directory won't replace conflicting files

（我第一次运行它时，它“运行”得很完美。）

这些神秘的文件是在哪里创建的？我该如何清除它们并让它与我实际可以看到/编辑的目录一起工作？

编辑：此方法基于 Docker 文档中的 Django 示例（https://docs.docker.com/compose/django/我已经尝试过该示例（逐字使用文件），但遇到了同样的问题：

$ docker-compose run web django-admin.py startproject composeexample .
Creating network "dockerdjangotest_default" with the default driver
Creating dockerdjangotest_db_1
Building web
Step 1 : FROM python:2.7
2.7: Pulling from library/python
efd26ecc9548: Already exists
a3ed95caeb02: Pull complete
d1784d73276e: Already exists
72e581645fc3: Already exists
9709ddcc4d24: Already exists
2d600f0ec235: Already exists
de1491f1bbd4: Pull complete
4becc568d2ff: Pull complete
Digest: sha256:ee46fc8b96ed0d1f1af71d0859ce6ba5f9be3b587f5a608193599b48d0a157c2
Status: Downloaded newer image for python:2.7
 ---> a3b29970a425
Step 2 : ENV PYTHONUNBUFFERED 1
 ---> Running in 35a6721182b3
 ---> d8424740fce4
Removing intermediate container 35a6721182b3
Step 3 : RUN mkdir /code
 ---> Running in d1c7e92821ab
 ---> 1c0b1da9e9d3
Removing intermediate container d1c7e92821ab
Step 4 : WORKDIR /code
 ---> Running in 120bb2d0e5dd
 ---> 72725e994f0e
Removing intermediate container 120bb2d0e5dd
Step 5 : ADD requirements.txt /code/
 ---> ef891d60690b
Removing intermediate container 862a5e314f2f
Step 6 : RUN pip install -r requirements.txt
 ---> Running in f51b2bc2ca48
Collecting Django (from -r requirements.txt (line 1))
  Downloading Django-1.9.5-py2.py3-none-any.whl (6.6MB)
Collecting psycopg2 (from -r requirements.txt (line 2))
  Downloading psycopg2-2.6.1.tar.gz (371kB)
Building wheels for collected packages: psycopg2
  Running setup.py bdist_wheel for psycopg2: started
  Running setup.py bdist_wheel for psycopg2: finished with status 'done'
  Stored in directory: /root/.cache/pip/wheels/e2/9a/5e/7b620848bbc7cfb9084aafea077be11618c2b5067bd532f329
Successfully built psycopg2
Installing collected packages: Django, psycopg2
Successfully installed Django-1.9.5 psycopg2-2.6.1
 ---> 349d20d9823e
Removing intermediate container f51b2bc2ca48
Step 7 : ADD . /code/
 ---> 38190d0f4c65
Removing intermediate container 0da1169b5cfa
Successfully built 38190d0f4c65

但是没有composeexample创建目录（与文档所说的这个目录现在的样子相反）：

$ ls -l
total 24
-rw-r--r--  1 user  wheel  146 Apr 17 17:50 Dockerfile
-rw-r--r--  1 user  wheel  209 Apr 17 17:51 docker-compose.yml
-rw-r--r--  1 user  wheel   16 Apr 17 17:50 requirements.txt

但 docker 似乎仍然相信一切都正常；那么那些文件在……某个地方？

$ docker-compose run web django-admin.py startproject composeexample .
CommandError: /code/manage.py already exists, overlaying a project or app into an existing directory won't replace conflicting files

答案1

要访问这些文件，您需要：

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