1. 環境

python==2.7

djang==1.11.2  # 1.8, 1.9, 1.10應該都沒問題

celery-with-redis==3.0  # 需要用到redis作為中間人服務(Broker)
celery==3.1.25  # 安裝上面的會自動安裝
kombu==3.0.37
billiard==3.3.0.23

django-celery==3.2.2  # celery外掛, 實現定時任務

celery>=4.0 對此環境會有報錯, 暫不建議在此環境下使用

2. 安裝

pip install django==1.11.2 celery-with
 
-redis==3.0 django-celery==3.2.2

3. 安裝Redis, 用作Broker (RabbitMQ 官方推薦, 但安裝麻煩點)

教程很多, 略

4. 新建django專案

官方文件

- Demo
  - Demo
    setting.py
    wsgi.py
    urls.py
  - app
    - migrations
    models.py
    views.py
    ...

• 配置settings.py

INSTALLED_APPS = (
    ...
    'app',
    'djcelery'
 
,# django-celery 可以在admin後臺定義定時任務, 開始前需要直接migrate
)


BROKER_URL = 'redis://127.0.0.1:6379/0'
BROKER_TRANSPORT = 'redis'

CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler'  # 資料庫排程

• 新建檔案Demo/Demo/celery.py

from __future__ import absolute_import

import os

from celery import Celery

# set the default Django settings module for the 'celery' program.
 

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'Demo.settings')

from django.conf import settings  # noqa

app = Celery('Demo')

# Using a string here means the worker will not have to
# pickle the object when using Windows.
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)


@app.task(bind=True)
def debug_task(self):
    print('Request: {0!r}'.format(self.request))

• 新建Demo/app/tasks.py

from Demo.celery import app

@app.task
def cus_task(*arg):
    print('This is a test task')

• 編輯Demo/app/views.py

from django.shortcuts import render, HttpResponse

from .tasks import cus_task


def index(request):
    cus_task.delay()
    return HttpResponse("Test async task")

• 啟動django和celery

# django
python manage.py runserver

# celery
celery -A Demo worker -l debug

admin後臺中配置celery計劃

• 配置

# 如上settings.py中的設定, 後執行
python manage.py migrate djcelery

• 登陸admin後臺進行配置

# Djcelery模組列表

Crontabs  # 同linux crontab
Intervals  # 間隔
Periodic tasks  # 週期任務
Tasks
Workers

配置一個periodic task任務內容 app.tasks.cus_task 用crontab或interval設定每5s執行一次

• 啟動django和celery, 並檢視日誌

celery -A Demo worker -l debug

# 另一個視窗
celery -A Demo beat -l debug --max-interval=10  # 每10s掃描一次djcelery任務