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Redis – Pass env variable to docker-compose

I have create a sample docker app with python and redis. Python is connected to the redis to store data. I want to pass the password servername to redis as an environment variable in docker-compose file. How can I achieve that?
Docker-compose:

version: "3.7"
services:
  nginx_app:
    image: nginx:latest 
    depends_on:
      - flask_app
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf
    ports:
      - 8082:80
    networks:
      - my_project_network
  flask_app:
    build:
      context: .
      dockerfile: Dockerfile
    expose:
      - 5000
    depends_on:
      - redis_app
    networks:
      - my_project_network
  redis_app:
    image: redis:latest
    command: redis-server --requirepass pass123 --appendonly yes
    volumes:
      - ./redis-vol:/data 
    expose:
      - 6379
    networks:
      - my_project_network
networks:
  my_project_network:

from flask import Flask
from redis import Redis

app = Flask(__name__)
redis = Redis(host='redis_app', port=6379, password='pass123')
@app.route('/')
def hello():
    redis.incr('hits')
    return 'Hello World! I have been seen %s times.' % redis.get('hits')
if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True)
Tags:

2

Answers


  1. 0

    just define environement variables in flask app and do os.getenv of them in python application, than add them to your flask app service in docker compose file:

    flask_app:
  environment:
    RABBIT_USER: guest
    RABBIT_PASSWORD: pass123

    In your python file place following:

    import os

redis = Redis(host='redis_app', port=6379, password=os.getenv('RABBIT_PASSWORD'))
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  2. 0

    As @AndriyIvaneyko says, in your docker-compose:

    flask_app:
  environment:
    - PASSWORD=password

    Another way that you can get this value is by setting an env variable in your shell export PASSWORD="password" and importing it into your docker-compose:

    flask_app:
  environment:
    - PASSWORD

    This is the approach I would recommend since it ensures that your credentials are not available in plain text in the docker-compose file. Moreover, collaboration becomes simpler as the env variable can be configured independently.

    In your python:

    from flask import Flask
from redis import Redis
import os

app = Flask(__name__)
redis = Redis(host='redis_app', port=6379, password=os.getenv('PASSWORD'))
@app.route('/')
def hello():
    redis.incr('hits')
    return 'Hello World! I have been seen %s times.' % redis.get('hits')
if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True)

    You can do the same thing with other env variables. Here is the documentation.

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