Django Academy · 课时

使用 Celery Beat 调度任务

按计划运行周期性任务

使用 Celery Beat 调度任务 是 CoddyKit 上的免费 Django Academy 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Django Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Django Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Beyond One-Off Tasks

So far tasks run when you queue them. But some jobs should run on a clock: nightly reports, hourly cleanups, weekly digests. That is where Beat comes in. ⏰

What Celery Beat Is

Celery Beat is a scheduler. It is a separate process that wakes up on time and drops scheduled tasks onto the same queue your workers read.

Beat Plus Worker

Beat only queues jobs on schedule; it never runs them itself. You still need a worker running to actually execute what Beat enqueues.

Install the Scheduler

The django-celery-beat package stores your schedule in the database, so you can even edit it from the admin later. Install it first.

pip install django-celery-beat

Define a Beat Schedule

In settings, CELERY_BEAT_SCHEDULE is a dict mapping a name to a task path and how often to run it.

CELERY_BEAT_SCHEDULE = {
    "daily-report": {
        "task": "reports.tasks.send_report",
        "schedule": 86400.0,
    },
}

Intervals in Seconds

A plain number means "every N seconds". So 86400.0 is once a day and 3600.0 is once an hour. Simple, but a bit rigid for real calendars.

Crontab for Real Calendars

For "8am every Monday" use a crontab schedule. It reads like a cron line and handles days, hours, and minutes precisely.

from celery.schedules import crontab
schedule = crontab(hour=8, minute=0, day_of_week=1)

Wire Crontab In

Drop a crontab object straight into the schedule value to control exactly when a task fires.

"weekly-digest": {
    "task": "news.tasks.digest",
    "schedule": crontab(hour=8, minute=0, day_of_week="mon"),
}

Run the Beat Process

Start Beat in its own terminal, beside the worker. Now you have three processes: web server, worker, and the beat scheduler.

celery -A myproject beat -l info

Avoid Duplicate Beats

Run only one Beat process. Two schedulers means every job fires twice, which can double-send emails or double-bill users. 🚫

Edit Schedules from Admin

With django-celery-beat, schedules live in the database, so non-developers can add or pause periodic tasks right from the Django admin.

Quick Check

What is the relationship between Celery Beat and the worker?

Recap: Scheduled Jobs

Celery Beat queues tasks on a schedule using intervals or crontab. Run exactly one Beat plus a worker, and edit schedules from the admin. 🗓️

常见问题解答

「使用 Celery Beat 调度任务」课时是免费的吗？

是的 — 「使用 Celery Beat 调度任务」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Django Academy 课程的其余内容，请升级到 CoddyKit PRO。 Django Academy 课程共包含 4 节课。

「使用 Celery Beat 调度任务」这节课中我会学到什么？

按计划运行周期性任务你通过在浏览器中直接运行的动手代码来练习 Django Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Django Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Django Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「使用 Celery Beat 调度任务」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Django Academy 课中编写并运行代码吗？

能。每节 Django Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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