我在使用Docker时遇到问题。实际上，Docker正在运行，且首页也可以正常工作。
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c459b9b1b603 application_web "python -u app.py" 41 seconds ago Up 39 seconds 0.0.0.0:5000->5000/tcp application_web_1
bc51d72486b0 mongo:3.0.2 "/entrypoint.sh mong…" 42 seconds ago Up 40 seconds 27017/tcp application_db_1
但是当我尝试访问一些包含MongoDB应用程序的页面时，会显示以下内容：
pymongo.errors.ServerSelectionTimeoutError
pymongo.errors.ServerSelectionTimeoutError: 127.0.0.1:27017: [Errno 111] Connection refused
我的机器上正在运行MongoDB，我可以使用POSTMAN访问。
以下是requirement.txt、docker-compose.yml和Dockerfile的配置：
Dockerfile
FROM python:3.6.1-alpine
WORKDIR /project
ADD . /project
RUN pip install -r requirements.txt
CMD ["python","app.py"]
docker-compose.yml
web:
build: .
command: python -u app.py
ports:
- "5000:5000"
volumes:
- .:/project
links:
- db
db:
image: mongo:3.0.2
requirements.txt
Flask==1.1.1
Bootstrap-Flask==1.1.0
pymongo==3.9.0
我正在使用以下命令进行代码构建和运行:
$ docker-compose build
$ docker-compose up
这是我得到的内容：
Status: Downloaded newer image for mongo:3.0.2
Creating application_db_1 ... done
Creating application_web_1 ... done
Attaching to application_db_1, application_web_1
db_1 | 2019-10-04T09:57:45.080+0000 I JOURNAL [initandlisten] journal dir=/data/db/journal
db_1 | 2019-10-04T09:57:45.081+0000 I JOURNAL [initandlisten] recover : no journal files present, no recovery needed
db_1 | 2019-10-04T09:57:45.213+0000 I JOURNAL [durability] Durability thread started
db_1 | 2019-10-04T09:57:45.213+0000 I JOURNAL [journal writer] Journal writer thread started
db_1 | 2019-10-04T09:57:45.215+0000 I CONTROL [initandlisten] MongoDB starting : pid=1 port=27017 dbpath=/data/db 64-bit host=bc51d72486b0
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] db version v3.0.2
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] git version: 6201872043ecbbc0a4cc169b5482dcf385fc464f
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] build info: Linux ip-10-171-120-232 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 BOOST_LIB_VERSION=1_49
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] allocator: tcmalloc
db_1 | 2019-10-04T09:57:45.216+0000 I CONTROL [initandlisten] options: {}
db_1 | 2019-10-04T09:57:45.216+0000 I INDEX [initandlisten] allocating new ns file /data/db/local.ns, filling with zeroes...
db_1 | 2019-10-04T09:57:45.277+0000 I STORAGE [FileAllocator] allocating new datafile /data/db/local.0, filling with zeroes...
db_1 | 2019-10-04T09:57:45.277+0000 I STORAGE [FileAllocator] creating directory /data/db/_tmp
db_1 | 2019-10-04T09:57:45.280+0000 I STORAGE [FileAllocator] done allocating datafile /data/db/local.0, size: 64MB, took 0.001 secs
db_1 | 2019-10-04T09:57:45.285+0000 I NETWORK [initandlisten] waiting for connections on port 27017
web_1 | * Serving Flask app "app" (lazy loading)
web_1 | * Environment: production
web_1 | WARNING: This is a development server. Do not use it in a production deployment.
web_1 | Use a production WSGI server instead.
web_1 | * Debug mode: on
web_1 | * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
web_1 | * Restarting with stat
web_1 | * Debugger is active!
web_1 | * Debugger PIN: 328-327-883
web_1 | 172.17.0.1 - - [04/Oct/2019 09:57:59] "GET / HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:00] "GET /favicon.ico HTTP/1.1" 404 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects HTTP/1.1" 500 -
web_1 | Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2463, in __call__
web_1 | return self.wsgi_app(environ, start_response)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2449, in wsgi_app
web_1 | response = self.handle_exception(e)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1866, in handle_exception
web_1 | reraise(exc_type, exc_value, tb)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
web_1 | raise value
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
web_1 | response = self.full_dispatch_request()
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
web_1 | rv = self.handle_user_exception(e)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
web_1 | reraise(exc_type, exc_value, tb)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
web_1 | raise value
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
web_1 | rv = self.dispatch_request()
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
web_1 | return self.view_functions[rule.endpoint](**req.view_args)
web_1 | File "/project/app.py", line 24, in list_objects
web_1 | return render_template('objects.html', rows=object_list)
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line 140, in render_template
web_1 | ctx.app,
web_1 | File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line 120, in _render
web_1 | rv = template.render(context)
web_1 | File "/usr/local/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render
web_1 | return original_render(self, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render
web_1 | return self.environment.handle_exception(exc_info, True)
web_1 | File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
web_1 | reraise(exc_type, exc_value, tb)
web_1 | File "/usr/local/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
web_1 | raise value.with_traceback(tb)
web_1 | File "/project/templates/objects.html", line 8, in top-level template code
web_1 | {% extends "template.html" %}
web_1 | File "/project/templates/template.html", line 46, in top-level template code
web_1 | {% block content %}
web_1 | File "/project/templates/objects.html", line 28, in block "content"
web_1 | {% for row in rows %}
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/cursor.py", line 1156, in next
web_1 | if len(self.__data) or self._refresh():
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/cursor.py", line 1050, in _refresh
web_1 | self.__session = self.__collection.database.client._ensure_session()
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1807, in _ensure_session
web_1 | return self.__start_session(True, causal_consistency=False)
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1760, in __start_session
web_1 | server_session = self._get_server_session()
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1793, in _get_server_session
web_1 | return self._topology.get_server_session()
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 477, in get_server_session
web_1 | None)
web_1 | File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 205, in _select_servers_loop
web_1 | self._error_message(selector))
web_1 | pymongo.errors.ServerSelectionTimeoutError: 127.0.0.1:27017: [Errno 111] Connection refused
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
web_1 | 172.17.0.1 - - [04/Oct/2019 10:00:39] "GET / HTTP/1.0" 200 -