Django + Mongo + Docker mendapatkan pymongo.errors.ServerSelectionTimeoutError

Oct 30 2020

Saya telah berjuang untuk menjalankan aplikasi sederhana menggunakan Django, Djongo, Mongo, dan Docker Compose. Pengaturan saya terlihat seperti ini:

docker-compose.yml

services:
  mongodb:
    image: mongo:latest
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: mongoadmin
      MONGO_INITDB_DATABASE: django_mongodb_docker
    ports:
      - 27017:27017

  web:
    build: ./src
    restart: always
    command: python src/manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - 8000:8000
    links:
      - mongodb

Dockerfile

FROM python:3
ENV PYTHONUNBUFFERED=1
RUN mkdir /code
COPY . /code/
WORKDIR /code
COPY requirements.txt /code/
RUN pip install -r requirements.txt

settings.py

DATABASES = {
    'default': {
        'ENGINE': 'djongo',
        'HOST': 'mongodb',
        'PORT': 27017,
        'USER': 'root',
        'PASSWORD': 'mongoadmin',
        'AUTH_SOURCE': 'admin',
        'AUTH_MECHANISM': 'SCRAM-SHA-1',
    }
}

Yang mengganggu adalah saya dapat menggunakan pymongo dari penampung web saya untuk terhubung ke penampung yang menjalankan mongo. Itu bekerja sebagai berikut.

from pymongo import MongoClient

c = MongoClient(
    'mongodb://mongodb:27017',
    username='root',
    password='mongoadmin',
    authSource='admin',
    authMechanism='SCRAM-SHA-1')

print(c.server_info())

Masalahnya adalah ketika saya menjalankan migrasi dari dalam wadah web saya, saya mendapatkan kesalahan berikut.

Traceback (most recent call last):
  File "/code/src/manage.py", line 22, in <module>
    main()
  File "/code/src/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 85, in wrapped
    res = handle_func(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 92, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/loader.py", line 53, in __init__
    self.build_graph()
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/loader.py", line 216, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/recorder.py", line 77, in applied_migrations
    if self.has_table():
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/recorder.py", line 56, in has_table
    tables = self.connection.introspection.table_names(cursor)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/introspection.py", line 48, in table_names
    return get_names(cursor)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/introspection.py", line 43, in get_names
    return sorted(ti.name for ti in self.get_table_list(cursor)
  File "/usr/local/lib/python3.9/site-packages/djongo/introspection.py", line 47, in get_table_list
    for c in cursor.db_conn.list_collection_names()
  File "/usr/local/lib/python3.9/site-packages/pymongo/database.py", line 863, in list_collection_names
    for result in self.list_collections(session=session, **kwargs)]
  File "/usr/local/lib/python3.9/site-packages/pymongo/database.py", line 825, in list_collections
    return self.__client._retryable_read(
  File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1460, in _retryable_read
    server = self._select_server(
  File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1278, in _select_server
    server = topology.select_server(server_selector)
  File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 241, in select_server
    return random.choice(self.select_servers(selector,
  File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 199, in select_servers
    server_descriptions = self._select_servers_loop(
  File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 215, in _select_servers_loop
    raise ServerSelectionTimeoutError(
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused, Timeout: 30s, Topology Description: <TopologyDescription id: 5f9ecaa5bbdc0433baa13966, topology_type: Single, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('localhost:27017: [Errno 111] Connection refused')>]>

Selain itu, saya telah mencoba membuat model Djongo dan menyimpannya untuk melihat apakah mungkin masalahnya khusus untuk migrasi (pada dasarnya hanya mencoba membuat koneksi ke mongo menggunakan djongo).

Django + Mongo + Docker mendapatkan pymongo.errors.ServerSelectionTimeoutError

Jawaban