1. Environment

python==2.7

djang==1.11.2  # 1.8, 1.9, 1.10应该都没问题

celery-with-redis==3.0  # 需要用到redis作为中间人服务(Broker)
celery==3.1.25  # 安装上面的会自动安装
kombu==3.0.37
billiard==3.3.0.23

django-celery==3.2.2  # celery插件, 实现定时任务

Celery>=4.0 does not support windows, please refer to the official documentation for details

2. Installation

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

3. Install Redis as a Broker (officially recommended by RabbitMQ, but troublesome to install)

教程很多, 略

4. Create a new django project

official documentation

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

configuresettings.py

INSTALLED_APPS = (
    ...
    'app',
    'djcelery',# django-celery 可以在admin后台定义定时任务, 开始前需要直接migrate
)


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

CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler'  # 数据库调度

create a new fileDemo/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))

newDemo/app/tasks.py

from Demo.celery import app

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

编辑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")


- 启动`django`和`celery`

django

python manage.py runserver

celery

celery -A Demo worker -l debug


#### admin后台中配置`celery`计划

- 配置

The settings in settings.py above, and then execute

python manage.py migrate djcelery


- 登陆admin后台进行配置

List of Djcelery modules

Crontabs # Same as linux crontab
Intervals # Interval
Periodic tasks # Periodic tasks
Tasks
Workers


> 配置一个`periodic task`任务内容 `app.tasks.cus_task` 用`crontab`或`interval`设置每5s执行一次

- 启动django和celery, 并查看日志

celery -A Demo worker -l debug

another window

celery -A Demo beat -l debug --max-interval=10 # Scan djcelery tasks every 10s




### 补充

- [ ] 安装`flower`

pip install flower


- [ ] 启动flower(默认启动一个webserver:5555)

python manage.py celery flower
```

[ ] Open the browser to http://localhost:5555view details

django -- Celery implements asynchronous tasks