运行 docker 时无法将“app.server”解析为属性名称或函数调用

Question

我正在尝试从 docker 运行我的应用程序，并且我从docker logs 收到此错误消息，用于我的仪表板。我搜索了很多，但找不到任何东西。请帮忙！

来自docker logs 的破折号图像的日志消息

[2020-08-22 06:44:32 +0000] [1] [INFO] Starting gunicorn 20.0.4
[2020-08-22 06:44:32 +0000] [1] [INFO] Listening at: http://0.0.0.0:8050 (1)
[2020-08-22 06:44:32 +0000] [1] [INFO] Using worker: sync
[2020-08-22 06:44:32 +0000] [8] [INFO] Booting worker with pid: 8
Failed to parse 'app.server' as an attribute name or function call.
[2020-08-22 06:44:33 +0000] [8] [INFO] Worker exiting (pid: 8)
[2020-08-22 06:44:33 +0000] [1] [INFO] Shutting down: Master
[2020-08-22 06:44:33 +0000] [1] [INFO] Reason: App failed to load.

我的 API 工作正常

[2020-08-22 06:44:31 +0000] [1] [INFO] Starting gunicorn 20.0.4
[2020-08-22 06:44:31 +0000] [1] [INFO] Listening at: http://0.0.0.0:5000 (1)
[2020-08-22 06:44:31 +0000] [1] [INFO] Using worker: sync
[2020-08-22 06:44:31 +0000] [8] [INFO] Booting worker with pid: 8

这是我的 Dash 应用程序。文件名为app.py，位于dash 文件夹内。

app = dash.Dash(
    __name__,
    external_stylesheets=external_stylesheets,
    meta_tags=[
        {"name": "viewport", "content": "width=device-width, initial-scale=1"}
    ],
    suppress_callback_exceptions=True
)

if __name__ == '__main__':
    ENVIRONMENT = os.environ.get("ENVIRONMENT", "dev")
    DEBUG = ENVRIONMENT == "dev"
    HOST = '0.0.0.0' if ENVIRONMENT == "prod" else 'localhost'
    app.run_server(debug=DEBUG, host=HOST)

这是我的Dockerfile Dash

FROM python:3.7

ADD requirements.txt /app/
WORKDIR /app
RUN pip install -r requirements.txt

ADD . /app

EXPOSE 8050

CMD ["gunicorn", "-b", "0.0.0.0:8050", "app:app.server"]

这是我的docker-compose.yml 文件

version: '3'
services:
  api:
    build:
      context: src/api
      dockerfile: Dockerfile
    environment:
      - ENVIRONMENT=prod
    restart: always
  dash:
    build:
      context: src/dash
      dockerfile: Dockerfile
    ports:
      - "8050:8050"
    environment:
      - ENVIRONMENT=prod
      - API_URL=http://api:5000/api
    depends_on:
      - api
    restart: always

这是我在api文件夹中的app.py文件的api代码

app = Flask(__name__)
api = Blueprint('api', __name__)

app.register_blueprint(api, url_prefix='/api')

if __name__ == "__main__":
    ENVIRONMENT = os.environ.get("ENVIRONMENT", "dev")
    DEBUG = ENVIRONMENT == "dev"
    HOST = '0.0.0.0' if ENVIRONMENT == "prod" else 'localhost'
    app.run(debug=DEBUG, host=HOST)

这是我的Dockerfile api

FROM python:3.7

ADD requirements.txt /app/
WORKDIR /app

RUN pip install -r requirements.txt

ADD . /app

EXPOSE 5000

CMD ["gunicorn", "-b", "0.0.0.0:5000", "app:app"]

这是我运行docker-compose up --build -d后得到的结果

Step 5/7 : ADD . /app
 ---> 5f1b89f2daeb
Step 6/7 : EXPOSE 5000
 ---> Running in 74a03831d03e
Removing intermediate container 74a03831d03e
 ---> cab01af5bfee
Step 7/7 : CMD ["gunicorn", "-b", "0.0.0.0:5000", "app:app"]
 ---> Running in 606197aae6fd
Removing intermediate container 606197aae6fd
 ---> 35be6754e766
Successfully built 35be6754e766
Successfully tagged appname_api:latest
Building dash
.
.
.

Step 5/7 : ADD . /app
 ---> c1111dca7a60
Step 6/7 : EXPOSE 8050
 ---> Running in ef1a216db216
Removing intermediate container ef1a216db216
 ---> a84d1d8ce503
Step 7/7 : CMD ["gunicorn", "-b", "0.0.0.0:8050", "app:app.server"]
 ---> Running in afc121660ddc
Removing intermediate container afc121660ddc
 ---> 600011a005ca
Successfully built 600011a005ca
Successfully tagged appname_dash:latest
Creating appname_api_1 ... done
Creating appname_dash_1 ... done

Answer 1

我在同事的应用程序中修复了此错误，他们在app.py 中有以下内容：

server = Flask(__name__) # define flask app.server
app = dash.Dash(
    __name__,
    server=server,
)

然后在index.py 他们正在做：

from app import app

server = app.server # I add this part here

然后 Docker CMD 是：

CMD ["gunicorn", "index:server", "-b", ":8050"]

它奏效了。

Answer 2

我有一个稍微不同的错误，但谷歌把我带到了这里，所以我为处于类似情况的其他人发帖。我有以下错误：

未能将 '' 解析为属性名称或函数调用。

我的问题是，在我的 Procfile 中，“wsgi:”和“app”之间有一个空格。下面是 Procfile 的正确语法。

网站：gunicorn wsgi:app

Answer 3

问题在于您传递给 gunicorn 的参数。根据您在此处显示的内容，我建议您尝试更改：

CMD ["gunicorn", "-b", "0.0.0.0:8050", "app:app.server"] 至：

CMD ["gunicorn", "-b", "0.0.0.0:8050", "app:server"]