RUN pip install: 确认 ssl 证书时出现问题：[SSL: CERTIFICATE_VERIFY_FAILED] 证书验证失败

Question

跟着[GitHub][1]的lab学习了更多关于Docker容器的知识，感觉有这个问题：

No matching distribution found for Flask==0.10.1 (from -r /usr/src/app/requirements.txt (line 1))
  Could not fetch URL https://pypi.python.org/simple/flask/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726) - skipping```


  [1]: https://github.com/docker/labs/blob/master/beginner/chapters/webapps.md

Answer 1

问题与我在 BlueCoat（一种防火墙）后面的网络中的事实有关，该网络检查并隐藏了我的桌面和互联网的几乎所有通信。

在谷歌搜索之后，我发现了忽略证书问题的命令：

只需将此添加到我的 dockerfile --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host=files.pythonhosted.org

# our base image
FROM alpine:3.5

# Install python and pip
RUN apk add --update py2-pip

# install Python modules needed by the Python app
COPY requirements.txt /usr/src/app/
RUN pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host=files.pythonhosted.org --no-cache-dir -r /usr/src/app/requirements.txt

# copy files required for the app to run
COPY app.py /usr/src/app/
COPY templates/index.html /usr/src/app/templates/

# tell the port number the container should expose
EXPOSE 5000

# run the application
CMD ["python", "/usr/src/app/app.py"]