想用django做一个自动运维平台，利用netsnmp来获取交换机及服务器信息，但是snmpget任务需要在后台实时运行，为了不影响html响应，利用celery来结合django做异步任务队列。

一、环境准备
1.首先安装celery
pip3 install celery
2.安装djcelery
pip3 install django-celery
3.安装一个broker
我们必须拥有一个broker消息队列用于发送和接收消息。Celery官网给出了多个broker的备选方案：RabbitMQ、Redis、Database（不推荐）以及其他的消息中间件。本次我们利用redis

sudo apt-get install redis

redis-server
启动redis服务， 端口假设为6379
redis-cli 查看redis 状态
[email protected]:~/Desktop/webserver/myserver# redis-cli
127.0.0.1:6379>

二、django 配置
配置settings.py
首先，在Django工程的settings.py文件中加入如下配置代码：

celery 配置信息 start

#############################
import djcelery

celery 配置

djcelery.setup_loader()
BROKER_URL = ‘redis://127.0.0.1:6379/1‘
CELERY_TIMEZONE = ‘Asia/Shanghai‘
CELERYBEAT_SCHEDULER = ‘djcelery.schedulers.DatabaseScheduler‘
CELERY_IMPORTS = (‘serverapp.task‘)
#############################

celery 配置信息 end

#############################

当djcelery.setup_loader()运行时，Celery便会去查看INSTALLD_APPS下包含的所有app目录中的tasks.py文件，找到标记为task的方法，将它们注册为celery task

? BROKER_URL：broker是代理人，它负责分发任务给worker去执行。我使用的是Redis作为broker

? 没有设置 CELERY_RESULT_BACKEND，默认没有配置，此时Django会使用默认的数据库(也是你指定的orm数据库)。

CELERY_IMPORTS：是导入目标任务文件

CELERYBEAT_SCHEDULER：使用了django-celery默认的数据库调度模型,任务执行周期都被存在默认指定的orm数据库中．

CELERYBEAT_SCHEDULE：设置定时的时间配置， 可以精确到秒，分钟，小时，天，周等。

3.在主工程的配置文件settings.py 中应用注册表INSTALLED_APPS中加入 djcelery

INSTALLED_APPS = [
‘django.contrib.admin‘,
‘django.contrib.auth‘,
‘django.contrib.contenttypes‘,
‘django.contrib.sessions‘,
‘django.contrib.messages‘,
‘django.contrib.staticfiles‘,
‘djcelery‘, #加入djcelery
]

4.（3）创建应用实例

? 在主工程目录添加celery.py， 添加自动检索django工程tasks任务

? vim artproject/celery.py

#目的是拒绝隐士引入，celery.py和celery冲突。
from future import absolute_import

import os

from celery import Celery, platforms
platforms.C_FORCE_ROOT = True

os.environ.setdefault(‘DJANGO_SETTINGS_MODULE‘, ‘myserver.settings‘)
#Specifying the settings here means the celery command line program will know where your Django project is.
#This statement must always appear before the app instance is created, which is what we do next:
from django.conf import settings

app = Celery(‘serverapp‘)

app.config_from_object(‘django.conf:settings‘)
#This means that you don’t have to use multiple configuration files, and instead configure Celery directly from the Django settings.
#You can pass the object directly here, but using a string is better since then the worker doesn’t have to serialize the object.

app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
#With the line above Celery will automatically discover tasks in reusable apps if you define all tasks in a separate tasks.py module.
#The tasks.py should be in dir which is added to INSTALLED_APP in settings.py.
#So you do not have to manually add the individual modules to the CELERY_IMPORT in settings.py.

@app.task(bind=True)
def debug_task(self):
print(‘Request: {0!r}‘.format(self.request)) #dumps its own request information

5.(4) 创建任务 tasks

每个任务本质上就是一个函数，在tasks.py中，写入你想要执行的函数即可。

在应用art中添加我们需要提供的异步服务和定时服务

vim art/tasks.py

#!/usr/bin/env python

encoding: utf-8

from future import absolute_import
import time
from django.core.mail import send_mail
from celery.utils.log import get_task_logger
from artproject.celery import app
?
from art.utils.send_mail import pack_html, send_emailbr/>?
@app.task
def tsend_email():
url = "http://1000phone.com"
receiver = ‘[email protected]‘
content = pack_html(receiver, url)

http://127.0.0.1:8000/art/add?x=188&y=22

#!/usr/bin/env python
#-- coding:utf-8 --
#written by zhouguangyou
#发送邮件(wd_email_check123账号用于内部测试使用，不要用于其他用途)
?
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.header import Header
import time
?
sender = ‘[email protected]‘
subject = u‘api开放平台邮箱验证‘
smtpserver = ‘smtp.163.com‘
username = ‘wwwwww‘
password = ‘wwwww1234‘
mail_postfix="163.com"
?
def send_email(receiver, content):
try:
me = username+"<"+username+"@"+mail_postfix+">"
msg = MIMEText(content, ‘html‘, ‘utf-8‘)
msg[‘Subject‘] = subject
msg[‘From‘] = sender
msg[‘To‘] = receiver
smtp = smtplib.SMTP()
smtp.connect(smtpserver)
smtp.login(username, password)
smtp.sendmail(sender, receiver, msg.as_string())
smtp.quit()
return True
except Exception as e:
print(‘send_email has error with : ‘ + str(e))
return False
?
?
def pack_html(receiver, url):
html_content = u"<html><div>尊敬的用户<font color=‘#0066FF‘>%s</font> 您好！</div><br>" \
"<div>感谢您关注我们的平台 ，我们将为您提供最贴心的服务，祝您购物愉快。</div><br>" \
"<div>点击以下链接，即可完成邮箱安全验证：</div><br>" \
"<div><a href=‘%s‘>%s</a></div><br>" \
"<div>为保障您的帐号安全，请在24小时内点击该链接; </div><br>" \
"<div>若您没有申请过验证邮箱 ，请您忽略此邮件，由此给您带来的不便请谅解。</div>" \
"</html>" % (receiver, url, url)
html_content = html_content
return html_content
?
?
if name == "main":
url = "http://xxxx.com"
receiver = ‘[email protected]‘
#content = pack_html(receiver, url)
content = ‘this is email content. at %s.‘%int(time.time())
send_email(receiver, content)

至此，在celery ui界面可以看到两类，定时器处理和异步处理。

原文地址：http://blog.51cto.com/lianlongfei/2315530