我有一个Django-Celery-PostgreSQL项目，应该部分在Docker中运行。让 Redis 和 PostgreSQL 服务器在机器上本地运行，并为项目使用虚拟环境，一切运行顺利。但是当我尝试设置 Docker 实例时，Celery 似乎无法连接到 Postgres 数据库，而 Django 可以。
在Docker中运行项目时，我只将Django和Celery放入其中并设置network_mode: "host"。Redis 和 Postgres 保留在本地计算机上。Django 服务器本身可以完美地将数据读取和写入 Postgres 数据库，但是当我尝试运行 Celery 任务时 - 我收到以下异常(由django_celery_results抛出(：
[2019-08-13 11:26:24,815: ERROR/MainProcess] Pool callback raised exception: OperationalError('could not connect to server: No such file or directoryntIs the server running locally and acceptingntconnections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?n',)
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
connection = Database.connect(**conn_params)
File "/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py", line 126, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/billiard/pool.py", line 1750, in safe_apply_callback
fun(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/celery/worker/request.py", line 371, in on_failure
store_result=self.store_errors,
File "/usr/local/lib/python3.6/site-packages/celery/backends/base.py", line 160, in mark_as_failure
traceback=traceback, request=request)
File "/usr/local/lib/python3.6/site-packages/celery/backends/base.py", line 342, in store_result
request=request, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django_celery_results/backends/database.py", line 38, in _store_result
using=using,
File "/usr/local/lib/python3.6/site-packages/django_celery_results/managers.py", line 50, in _inner
return fun(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django_celery_results/managers.py", line 129, in store_result
defaults=fields)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 538, in get_or_create
return self.get(**kwargs), False
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 402, in get
num = len(clone)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 256, in __len__
self._fetch_all()
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 1242, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 55, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1098, in execute_sql
cursor = self.connection.cursor()
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 256, in cursor
return self._cursor()
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 233, in _cursor
self.ensure_connection()
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
connection = Database.connect(**conn_params)
File "/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py", line 126, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
Docker-compose：
version: '3'
services:
road_data_service:
build:
context: ./
dockerfile: ./_docker/backend/local_dev/Dockerfile
volumes:
- ./:/server
network_mode: "host"
ports:
- "8326:8000"
Dockerfile：
RUN apt-get update
&& apt-get install -y binutils libproj-dev gdal-bin
&& rm -rf /var/lib/apt/lists/*
WORKDIR ./
COPY ./ /server
COPY _docker/backend/local_dev/entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
WORKDIR /server/
CMD python3 manage.py runserver 0.0.0.0:8000 && celery -A worker_name
worker -l info
原来我搞砸了celery.pyDJANGO_SETTINGS_MODULE- Celery 获得了通用设置文件，而不是用于本地开发的设置文件。