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我正在尝试使用 celerybeat 设置一个 celery 任务队列，以便定期更新数据库。我的 celeryd 服务似乎运行良好，但 celerybeat 不断给我一个Connection error: [Errno 111]：

[2012-09-10 09:40:18,954: INFO/MainProcess] Celerybeat: Starting...
[2012-09-10 09:40:19,001: ERROR/MainProcess] Celerybeat: Connection error: [Errno 111] Connection refused. Trying again in 2.0 seconds...
[2012-09-10 09:40:22,004: ERROR/MainProcess] Celerybeat: Connection error: [Errno 111] Connection refused. Trying again in 4.0 seconds...
[2012-09-10 09:40:32,012: ERROR/MainProcess] Celerybeat: Connection error: [Errno 111] Connection refused. Trying again in 6.0 seconds...
[2012-09-10 09:40:53,030: ERROR/MainProcess] Celerybeat: Connection error: [Errno 111] Connection refused. Trying again in 8.0 seconds...
[2012-09-10 09:41:29,052: ERROR/MainProcess] Celerybeat: Connection error: [Errno 111] Connection refused. Trying again in 10.0 seconds...

这是我的 celeryconfig 文件：

from celery.schedules import crontab
import datetime

BROKER_URL = 'mongodb://localhost:27017/tasks'
CELERY_RESULT_BACKEND = 'mongodb'
CELERY_MONGODB_BACKEND_SETTINGS = {
    "host": "127.0.0.1",
    "port": 27017,
    "database": "celery",
    "taskmeta_collection": "celery_taskmeta",
}

CELERYBEAT_SCHEDULE = {
    'update-linked-calendars': {
        'task': 'tasks.initiateUpdate',
        'schedule': crontab(minute=0, hour='*/1')
    },
}

CELERY_IMPORTS = ('tasks',)

我已经为此工作了很长时间，但仍然对为什么会收到此错误感到困惑。我的 MongoDB 没有用户/密码（完美地用于我的应用程序）。任何帮助将不胜感激！

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