Celery 看不到 redis 代理

Question

我正在嘗試將 Celery 與 Redis 一起使用。

這是我的celery.py文件：

from __future__ import absolute_import
from celery import Celery

celery=Celery(include=[ 'tasks.chatterbox' ])

# import celery config file
celery.config_from_object('celeryconfig')

if __name__ == '__main__':
    celery.start()

這是我的celeryconfig.py文件：

BROKER_URL = 'redis://localhost:6379/0'

# redis backend
CELERY_RESULT_BACKEND = 'redis://'

當我運行時：

celery -A broker.celery worker -l info

我收到此錯誤：

Traceback (most recent call last):
  File "/usr/local/bin/celery", line 9, in <module>
    load_entry_point('celery==3.1.11', 'console_scripts', 'celery')()
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/__main__.py", line 30, in main
    main()
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/celery.py", line 81, in main
    cmd.execute_from_commandline(argv)
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/celery.py", line 769, in execute_from_commandline
    super(CeleryCommand, self).execute_from_commandline(argv)))
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/base.py", line 306, in execute_from_commandline
    return self.handle_argv(self.prog_name, argv[1:])
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/celery.py", line 761, in handle_argv
    return self.execute(command, argv)
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/celery.py", line 693, in execute
    ).run_from_argv(self.prog_name, argv[1:], command=argv[0])
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/worker.py", line 179, in run_from_argv
    return self(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/base.py", line 269, in __call__
    ret = self.run(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/bin/worker.py", line 212, in run
    state_db=self.node_format(state_db, hostname), **kwargs
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/worker/__init__.py", line 100, in __init__
    self.setup_instance(**self.prepare_args(**kwargs))
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/worker/__init__.py", line 126, in setup_instance
    self.should_use_eventloop() if use_eventloop is None
  File "/usr/local/lib/python2.7/dist-packages/celery-3.1.11-py2.7.egg/celery/worker/__init__.py", line 245, in should_use_eventloop
    self._conninfo.is_evented and not self.app.IS_WINDOWS)
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/connection.py", line 836, in is_evented
    return self.transport.supports_ev
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/connection.py", line 786, in transport
    self._transport = self.create_transport()
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/connection.py", line 518, in create_transport
    return self.get_transport_cls()(client=self)
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/transport/redis.py", line 916, in __init__
    self.connection_errors, self.channel_errors = self._get_errors()
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/transport/redis.py", line 954, in _get_errors
    return get_redis_error_classes()
  File "/usr/local/lib/python2.7/dist-packages/kombu-3.0.16-py2.7.egg/kombu/transport/redis.py", line 78, in get_redis_error_classes
    from redis import exceptions
ImportError: No module named redis

最后是我的項目結構：

.
├── __init__.py
├── celeryconfig.py
├── broker
│   ├── celery.py
│   ├── __init__.py    
├── tasks
    ├── chatterbox.py
    ├── __init__.py

我在用：

• 芹菜 3.1.11
• Redis 2.8.8

Answer 1

錯誤跟蹤清楚地說明了原因（像往常一樣，自下而上閱讀）

ImportError: No module named redis

您可以檢查是否安裝了redis

使用pip

$ pip freeze

輸出應包含以redis=開頭的行

安裝redis：

$ pip install redis

我使用virtualenv有時忘記切換到適當的環境。 在這些情況下，我會錯過我希望出現的模塊。 然后我只需切換到適當的虛擬環境或安裝缺少的模塊。

PS：成為專家的基本技巧是閱讀錯誤消息並遵循它。

Answer 2

您可以使用 celery[redis] 包一次性安裝 Celery 和 Redis (python) 依賴項

$ pip install -U celery[redis]

參考

• Celery - 使用 Redis 作為代理
• 可用的 Celery 捆綁包

Answer 3

我遇到了這個問題並通過使用 python3 安裝 redis 來修復它。 有時，如果您不指定，您的系統默認使用 python2。 在命令行或終端中，輸入

python3 -m pip install redis

那應該為您下載 Python3 中的 redis，它對我有用。