我有一个可以成功初始化并连接到 Postgresql 数据库的 flask 应用程序。但是,当我尝试 dockerize 这个应用程序时,我收到以下错误消息。 “SQLALCHEMY_DATABASE_URI”是正确的,我可以连接到它,所以我不知道我哪里出错了。
docker-compose 日志
app_1 | File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/url.py", line 60, in __init__
app_1 | self.port = int(port)
app_1 | ValueError: invalid literal for int() with base 10: 'None'
Postgres 数据库在 Docker 容器中连接成功
postgres_1 | LOG: database system is ready to accept connections
config.py
from os import environ
import os
RDS_USERNAME = environ.get('RDS_USERNAME')
RDS_PASSWORD = environ.get('RDS_PASSWORD')
RDS_HOSTNAME = environ.get('RDS_HOSTNAME')
RDS_PORT = environ.get('RDS_PORT')
RDS_DB_NAME = environ.get('RDS_DB_NAME')
SQLALCHEMY_DATABASE_URI = "postgresql+psycopg2://{username}:{password}@{hostname}:{port}/{dbname}"\
.format(username = RDS_USERNAME, password = RDS_PASSWORD, \
hostname = RDS_HOSTNAME, port = RDS_PORT, dbname = RDS_DB_NAME)
flask_app.py(入口点)
def create_app():
app = Flask(__name__, static_folder="./static", template_folder="./static")
app.config.from_pyfile('./app/config.py', silent=True)
register_blueprint(app)
register_extension(app)
with app.app_context():
print(db) -> This prints the correct path for SQLALCHEMY_DATABASE_URI
db.create_all()
db.session.commit()
return app
def register_blueprint(app):
app.register_blueprint(view_blueprint)
app.register_blueprint(race_blueprint)
def register_extension(app):
db.init_app(app)
migrate.init_app(app)
app = create_app()
if __name__ == '__main__':
app.run(host='0.0.0.0', port=8080, debug=True)
Dockerfile
FROM ubuntu
RUN apt-get update && apt-get -y upgrade
RUN apt-get install -y python-pip && pip install --upgrade pip
RUN mkdir /home/ubuntu
WORKDIR /home/ubuntu/celery-scheduler
ADD requirements.txt /home/ubuntu/celery-scheduler/
RUN pip install -r requirements.txt
COPY . /home/ubuntu/celery-scheduler
EXPOSE 5000
CMD ["python", "flask_app.py", "--host", "0.0.0.0"]
docker-compose.yml
version: '2'
services:
app:
restart: always
build:
context: .
dockerfile: Dockerfile
volumes:
- .:/app
depends_on:
- postgres
postgres:
restart: always
image: postgres:9.6
environment:
- POSTGRES_USER=${RDS_USERNAME}
- POSTGRES_PASSWORD=${RDS_PASSWORD}
- POSTGRES_HOSTNAME=${RDS_HOSTNAME}
- POSTGRES_DB=${RDS_DB_NAME}
ports:
- "5432:5432"
最佳答案
您需要在Dockerfile中设置环境变量RDS_USERNAME、RDS_PASSWORD、RDS_HOSTNAME、RDS_PORT和RDS_DB_NAME,例如ENV键值
,例如
ENV RDS_PORT 5432
关于python - docker , flask ,SQLAlchemy : ValueError: invalid literal for int() with base 10: 'None' ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52127228/