Docker：如何获取 virtualenv 并安装 requirements.txt？

Question

我不确定我在这里遗漏了什么。 canonicaliser_api 包含我的代码和 requirements.txt.

FROM ubuntu:14.04.2
RUN rm /bin/sh && ln -s /bin/bash /bin/sh
RUN apt-get -y update && apt-get upgrade -y
RUN apt-get install python build-essential python-dev python-pip python-setuptools -y
RUN apt-get install libxml2-dev libxslt1-dev python-dev -y
RUN apt-get install libpq-dev postgresql-common postgresql-client -y
RUN apt-get install openssl openssl-blacklist openssl-blacklist-extra -y
RUN apt-get install nginx -y
RUN pip install virtualenv uwsgi

ADD canonicaliser_api /home/ubuntu
RUN virtualenv /home/ubuntu/canonicaliser_api/venv
RUN source /home/ubuntu/canonicaliser_api/venv/bin/activate && pip install -r /home/ubuntu/canonicaliser_api/requirements.txt

RUN echo "daemon off;" >> /etc/nginx/nginx.conf
EXPOSE 80

CMD service nginx start

当我尝试构建它时，一切正常，直到第 11 步：

Step 11 : RUN source /home/ubuntu/canonicaliser_api/venv/bin/activate && pip install -r /home/ubuntu/canonicaliser_api/requirements.txt
 ---> Running in 7aae5bd92b70
/home/ubuntu/canonicaliser_api/venv/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
Could not open requirements file: [Errno 2] No such file or directory: '/home/ubuntu/canonicaliser_api/requirements.txt'
The command '/bin/sh -c source /home/ubuntu/canonicaliser_api/venv/bin/activate && pip install -r /home/ubuntu/canonicaliser_api/requirements.txt' returned a non-zero code: 1

但这没有意义，我已经通过 ADD 在 Dockerfile 中添加了整个代码目录。我在这里错过了什么吗？

bash-3.2$ ls canonicaliser_api/requirements.txt 
canonicaliser_api/requirements.txt
bash-3.2$

Answer 1

复制目录时要小心，尤其是当目标目录不存在时。简而言之，这行不通：

ADD canonicaliser_api /home/ubuntu

但这应该：

ADD canonicaliser_api /home/ubuntu/canonicaliser_api

一般来说，最好避免使用 ADD 指令，而使用 COPY 代替。在这种情况下，它只是直接替换。

将来，调试此类事情的一种方法是获取最后一个成功构建的图像（在本例中，来自 ADD 行的图像）并从中启动一个容器。然后你可以尝试运行有问题的指令并找出问题所在。

Answer 2

用法是：ADD [源目录或URL] [目标目录]

您需要将文件夹名称添加到目的地：

ADD canonicaliser_api /home/ubuntu/canonicaliser_api

Docker：如何获取 virtualenv 并安装 requirements.txt？

Docker: How to source a virtualenv and install requirements.txt?

python

docker

virtualenv