1. 在生成鏡像時，安裝指定python包時報錯
> RUN pip install -i https://doubanio.com/simple/ -r requirement.txt
ERROR: Could not install packages due to an EnvironmentError: [Errno 39] Directory not empty: '/usr/local/python3/lib/python3.6/site-packages/certifi-2018.11.29.dist-info/'
解決方案
發現還是權限問題，故需加入參數--user解決
RUN pip install --user -i https://doubanio.com/simple/ -r requirement.txt