无法连接到redis容器

Question

我正在尝试使用环境变量将 redis 容器连接到 python 应用程序容器。我将密码作为环境变量传递但它没有连接，如果我不使用环境变量并对密码进行硬编码，它可以正常工作，否则它会给出redis.exceptions.ConnectionError

version: "3.7"
services:
  nginx_app:
    image: nginx:latest
    depends_on:
      - flask_app
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf
    ports:
      - 8090:80
    networks:
      - my_project_network

  flask_app:
    build:
      context: .
      dockerfile: Dockerfile
    expose:
      - 5000
    environment:
      - PASSWORD=pass123a
    depends_on:
      - redis_app
    networks:
      - my_project_network

  redis_app:
    image: redis:latest
    command: redis-server --requirepass ${PASSWORD} --appendonly yes
    environment:
      - PASSWORD=pass123a
    volumes:
      - ./redis-vol:/data 
    expose:
      - 6379
    networks:
      - my_project_network
networks:
  my_project_network:

index.py

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)

Answer 1

更新你的 docker-compose.yaml

环境是一个字符串列表：

docker-composer 对 ${ENV} 进行插值，其中 ENV 的值是从 .env 文件加载的

用途：

command: redis-server --requirepass $PASSWORD --appendonly yes

代替：

command: redis-server --requirepass ${PASSWORD} --appendonly yes

您可以通过以下方式验证容器内的环境变量：

docker-compose run --rm flask_app printenv | grep PASSWORD

应该返回：

PASSWORD=pass123a

docker-compose 环境变量示例：Here

Answer 2

您似乎错过了将环境变量传递给您的 Redis 容器。

试试这个：

version: "3.7"
services:
  nginx_app:
    image: nginx:latest 
    #LOCAL IMAGE
    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
    environment:
      - PASSWORD=pass123a
    depends_on:
      - redis_app
    networks:
      - my_project_network

  redis_app:
    image: redis:latest
    command: redis-server --requirepass ${PASSWORD} --appendonly yes
    environment:
      - PASSWORD=pass123a
    volumes:
      - ./redis-vol:/data 
    expose:
      - 6379
    networks:
      - my_project_network
networks:
  my_project_network: