而对于我的项目运行像我得到的错误。在这里，我想我的dockerize应用

Question

db_url = os.environ['OPENSHIFT_MYSQL_DB_URL']
  File "/usr/local/lib/python2.7/UserDict.py", line 40, in __getitem__
  raise KeyError(key)
  KeyError: 'OPENSHIFT_MYSQL_DB_URL'

My Dockerfile look like:
 FROM python:2.7.13
 RUN apt-get update && apt-get install -y libsasl2-dev python-dev 
 libldap2-dev
 RUN apt-get install -y gcc libc-dev unixodbc-dev libffi-dev
 RUN apt-get install -y apt-utils
 RUN apt-get install -y libmysqlclient-dev libssl-dev netcat
 RUN pip install --upgrade pip
 COPY . /LAE-python
 WORKDIR /LAE-python
 RUN pwd
 #RUN pip install -r requirements.txt
 RUN python setup.py develop
 ENTRYPOINT ["pserve"]
 CMD ["development.ini","--reload"]


My Code :
import os
import sys
import transaction
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session
from sqlalchemy.orm import sessionmaker
from sqlalchemy import create_engine
from sqlalchemy import Column,Integer, String,ForeignKey

from mtools.settings import mysql_user,mysql_passowrd,database_name

db_session = 
scoped_session(sessionmaker(autocommit=False,autoflush=False))
db_url = os.environ['OPENSHIFT_MYSQL_DB_URL']
engine_string = db_url+database_name

我收到错误“db_url = os.environ [‘OPENSHIFT_MYSQL_DB_URL’]”行，我的问题是如何设置这些环境变量中的一个dockerfile，这样我就可以建立图像和运行它。莱城服务器早期的教代码现在我们正在向一些containerize基于服务器。

Answer 1

你的问题是关系到一个ENV配置设置，所以，我已经去除了一切向您展示问题的所在：

这与ENV设定dockerfile

FROM python:2.7.13
RUN apt-get update && apt-get install -y libsasl2-dev python-dev libldap2-dev
RUN apt-get install -y gcc libc-dev unixodbc-dev libffi-dev
RUN apt-get install -y apt-utils
RUN apt-get install -y libmysqlclient-dev libssl-dev netcat
RUN pip install --upgrade pip

ENV OPENSHIFT_MYSQL_DB_URL "your URL"

COPY . /LAE-python
WORKDIR /LAE-python

CMD ["python","-u", "setup.py"]

这是setup.py：

import os
import sys

db_url = os.environ['OPENSHIFT_MYSQL_DB_URL']
print db_url

现在，您可以访问您的os.environ变量。

参考：

https://vsupalov.com/docker-arg-env-variable-guide/