无法使用 docker-compose 连接到 MongoDB

Question

我在使用 docker 时遇到问题。docker 正在运行，并且主页正在运行。

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CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES\nc459b9b1b603        application_web     "python -u app.py"       41 seconds ago      Up 39 seconds       0.0.0.0:5000->5000/tcp   application_web_1\nbc51d72486b0        mongo:3.0.2         "/entrypoint.sh mong\xe2\x80\xa6"   42 seconds ago      Up 40 seconds       27017/tcp                application_db_1\n

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但是当我尝试访问一些有 MongoDB 应用程序的页面时，它显示以下内容：

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pymongo.errors.ServerSelectionTimeoutError\npymongo.errors.ServerSelectionTimeoutError: 127.0.0.1:27017: [Errno 111] Connection refused\n

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MongoDB 正在我的机器上运行，我可以使用POSTMAN访问。

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这是requirement.txt,docker-compose.yml和Dockerfile配置：

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Dockerfile

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FROM python:3.6.1-alpine\nWORKDIR /project\nADD . /project\nRUN pip install -r requirements.txt\nCMD ["python","app.py"]\n

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docker-compose.yml

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web:\n  build: .\n  command: python -u app.py\n  ports:\n    - "5000:5000"\n  volumes:\n    - .:/project\n  links:\n    - db\ndb:\n  image: mongo:3.0.2\n

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要求.txt

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Flask==1.1.1\nBootstrap-Flask==1.1.0\npymongo==3.9.0\n

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我使用以下方式构建和运行：

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$ docker-compose build\n$ docker-compose up\n

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这是我得到的：

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Status: Downloaded newer image for mongo:3.0.2\nCreating application_db_1 ... done\nCreating application_web_1 ... done\nAttaching to application_db_1, application_web_1\ndb_1   | 2019-10-04T09:57:45.080+0000 I JOURNAL  [initandlisten] journal dir=/data/db/journal\ndb_1   | 2019-10-04T09:57:45.081+0000 I JOURNAL  [initandlisten] recover : no journal files present, no recovery needed\ndb_1   | 2019-10-04T09:57:45.213+0000 I JOURNAL  [durability] Durability thread started\ndb_1   | 2019-10-04T09:57:45.213+0000 I JOURNAL  [journal writer] Journal writer thread started\ndb_1   | 2019-10-04T09:57:45.215+0000 I CONTROL  [initandlisten] MongoDB starting : pid=1 port=27017 dbpath=/data/db 64-bit host=bc51d72486b0\ndb_1   | 2019-10-04T09:57:45.216+0000 I CONTROL  [initandlisten] db version v3.0.2\ndb_1   | 2019-10-04T09:57:45.216+0000 I CONTROL  [initandlisten] git version: 6201872043ecbbc0a4cc169b5482dcf385fc464f\ndb_1   | 2019-10-04T09:57:45.216+0000 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013\ndb_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\ndb_1   | 2019-10-04T09:57:45.216+0000 I CONTROL  [initandlisten] allocator: tcmalloc\ndb_1   | 2019-10-04T09:57:45.216+0000 I CONTROL  [initandlisten] options: {}\ndb_1   | 2019-10-04T09:57:45.216+0000 I INDEX    [initandlisten] allocating new ns file /data/db/local.ns, filling with zeroes...\ndb_1   | 2019-10-04T09:57:45.277+0000 I STORAGE  [FileAllocator] allocating new datafile /data/db/local.0, filling with zeroes...\ndb_1   | 2019-10-04T09:57:45.277+0000 I STORAGE  [FileAllocator] creating directory /data/db/_tmp\ndb_1   | 2019-10-04T09:57:45.280+0000 I STORAGE  [FileAllocator] done allocating datafile /data/db/local.0, size: 64MB,  took 0.001 secs\ndb_1   | 2019-10-04T09:57:45.285+0000 I NETWORK  [initandlisten] waiting for connections on port 27017\nweb_1  |  * Serving Flask app "app" (lazy loading)\nweb_1  |  * Environment: production\nweb_1  |    WARNING: This is a development server. Do not use it in a production deployment.\nweb_1  |    Use a production WSGI server instead.\nweb_1  |  * Debug mode: on\nweb_1  |  * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)\nweb_1  |  * Restarting with stat\nweb_1  |  * Debugger is active!\nweb_1  |  * Debugger PIN: 328-327-883\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:57:59] "GET / HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:00] "GET /favicon.ico HTTP/1.1" 404 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects HTTP/1.1" 500 -\nweb_1  | Traceback (most recent call last):\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2463, in __call__\nweb_1  |     return self.wsgi_app(environ, start_response)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2449, in wsgi_app\nweb_1  |     response = self.handle_exception(e)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1866, in handle_exception\nweb_1  |     reraise(exc_type, exc_value, tb)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise\nweb_1  |     raise value\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app\nweb_1  |     response = self.full_dispatch_request()\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request\nweb_1  |     rv = self.handle_user_exception(e)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception\nweb_1  |     reraise(exc_type, exc_value, tb)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise\nweb_1  |     raise value\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request\nweb_1  |     rv = self.dispatch_request()\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request\nweb_1  |     return self.view_functions[rule.endpoint](**req.view_args)\nweb_1  |   File "/project/app.py", line 24, in list_objects\nweb_1  |     return render_template(\'objects.html\', rows=object_list)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line 140, in render_template\nweb_1  |     ctx.app,\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/flask/templating.py", line 120, in _render\nweb_1  |     rv = template.render(context)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render\nweb_1  |     return original_render(self, *args, **kwargs)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render\nweb_1  |     return self.environment.handle_exception(exc_info, True)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception\nweb_1  |     reraise(exc_type, exc_value, tb)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise\nweb_1  |     raise value.with_traceback(tb)\nweb_1  |   File "/project/templates/objects.html", line 8, in top-level template code\nweb_1  |     {% extends "template.html" %}\nweb_1  |   File "/project/templates/template.html", line 46, in top-level template code\nweb_1  |     {% block content %}\nweb_1  |   File "/project/templates/objects.html", line 28, in block "content"\nweb_1  |     {% for row in rows %}\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/cursor.py", line 1156, in next\nweb_1  |     if len(self.__data) or self._refresh():\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/cursor.py", line 1050, in _refresh\nweb_1  |     self.__session = self.__collection.database.client._ensure_session()\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1807, in _ensure_session\nweb_1  |     return self.__start_session(True, causal_consistency=False)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1760, in __start_session\nweb_1  |     server_session = self._get_server_session()\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1793, in _get_server_session\nweb_1  |     return self._topology.get_server_session()\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 477, in get_server_session\nweb_1  |     None)\nweb_1  |   File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 205, in _select_servers_loop\nweb_1  |     self._error_message(selector))\nweb_1  | pymongo.errors.ServerSelectionTimeoutError: 127.0.0.1:27017: [Errno 111] Connection refused\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:31] "GET /objects?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 09:58:32] "GET /objects?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -\nweb_1  | 172.17.0.1 - - [04/Oct/2019 10:00:39] "GET / HTTP/1.0" 200 -\n

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Answer 1

pymongo.errors.ServerSelectionTimeoutError：127.0.0.1：27017：[Errno 111]连接被拒绝

似乎您正在尝试连接localhost容器web。

将应用程序中的连接字符串更新为

client = MongoClient('db', 27017)

另外，删除linkingdocker-compose 创建默认网络，然后您可以引用具有该名称的任何容器。

当 docker-compose 执行 V2 文件时，它将自动在文件中定义的所有容器之间构建网络，并且每个容器只需使用 docker-compose.yml 文件中定义的名称即可立即引用其他容器。

你需要添加depends_on:

web:
  build: .
  command: python -u app.py
  ports:
    - "5000:5000"
  depends_on:
    - db
  volumes:
    - .:/project
  links:
    - db
db:
  image: mongo:3.0.2

依赖于取决于

服务之间表达依赖关系，服务依赖关系会导致以下行为：

docker-compose up 按依赖顺序启动服务。在以下示例中，db 和 redis 在 web 之前启动。

撰写文件依赖