Docker Flask 应用程序环境变量

Question

I'm starting a docker container the following way:

docker run -e IP_AD=192.168.99.100 -p 80:80 flask_app

I'm simply trying to pass an IP Address to the flask application so that something can be loaded from my application. This resource will change from environment to environment, so this is the reason I would like to pass it as an environment variable.

Later, I would like to use this variable but from the context of the running flask application. How can I load IP_AD from my flask application and use it as a python variable?

I've tried doing this:

import os
os.environ.get('IP_AD')

But it does not seem to be loading anything. What is the correct way to load IP_AD passed from docker run -e

Answer 1

create file .env like this

model_path=./model/data_fs.csv

then install library .env by doing

pip3 install python-dotenv==0.17.1

add this to your code to load all your .env variable

from dotenv import load_dotenv
load_dotenv()

so you can access it

if os.getenv("model_path", None) is not None:
    return os.getenv("model_path", None)
# otherwise raise an exception
raise Exception("no .env file found")

Answer 2

you can try like this

import os
os.environ["IP_AD"]