python - 链接 python app docker 和 postgres docker

Question

我有两个通过以下命令运行的 docker 容器:

• docker run --name postgres -v "/Users/xxx/Desktop/Coding/DockerMounting":/home/-e POSTGRES_PASSWORD=xyz -d postgres

• docker run -it -v "/Users/xxx/Desktop/Coding/DockerMounting":/home/t -p 5000:5000 --name some-app --link postgres:postgres -d xxx/ubuntu:最新

我已经在我的 postgres (psql) 容器中创建了必要的用户、数据库和表。

我正在尝试运行 python 脚本:

import os

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker

engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))

def main():
    flights = db.execute("SELECT origin, destination, duration FROM flights").fetchall()
    for flight in flights:
        print(f"{flight.origin} to {flight.destination}, {flight.duration} minutes.")

if __name__ == "__main__":
    main()

我收到以下错误:

  File "list.py", line 6, in <module>
    engine = create_engine(os.getenv("DATABASE_URL"))
  File "/usr/local/lib/python3.6/dist-packages/sqlalchemy/engine/__init__.py", line 435, in create_engine
    return strategy.create(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/sqlalchemy/engine/strategies.py", line 56, in create
    plugins = u._instantiate_plugins(kwargs)

我知道一个问题是我需要设置 DATABASE_URL env - 但我不确定该值应该是多少

Answer 1

基于documentation DATABASE_URL 环境变量应该是这样的:postgresql://postgres:xyz@postgres:5432/postgres