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@@ -29,6 +29,48 @@ type:
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logger = self.get_logger(\*\*kwargs)
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logger.info("Execute every Monday at 7:30AM.")
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+The syntax of these crontab expressions is very flexible. Some examples:
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+
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++-------------------------------------+--------------------------------------------+
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+| **Example** | **Meaning** |
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++-------------------------------------+--------------------------------------------+
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+| crontab() | Execute every minute. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, hour=0) | Execute daily at midnight. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, | Execute every three hours---at midnight, |
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+| | 3am, 6am, 9am, noon, 3pm, 6pm, 9pm. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, | Same as previous. |
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+| hour=[0,3,6,9,12,15,18,21]) | |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute="\*/15") | Execute every 15 minutes. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(day_of_week="sunday") | Execute every minute (!) at sundays. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute="*", | Same as previous. |
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+| hour="*", | |
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+| day_of_week="sun") | |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute="\*/10", | Execute every ten minutes, but only |
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+| hour="3,17,22", | between 3-4 am, 5-6 pm and 10-11 pm on |
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+| day_of_week="thu,fri") | thursdays or fridays. |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, hour="\*/2,\*/3") | Execute every even hour, and every hour |
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+| | divisable by three. This means: |
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+| | at every hour *except*: 1am, |
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+| | 5am, 7am, 11am, 1pm, 5pm, 7pm, |
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+| | 11pm |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, hour="\*/5") | Execute hour divisable by 5. This means |
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+| | that it is triggered at 3pm, not 5pm |
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+| | (since 3pm equals the 24-hour clock |
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+| | value of "15", which is divisable by 5). |
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++-------------------------------------+--------------------------------------------+
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+| crontab(minute=0, hour="\*/3,8-17") | Execute every hour divisable by 3, and |
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+| | every hour during office hours (8am-5pm). |
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++-------------------------------------+--------------------------------------------+
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+
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If you want to use periodic tasks you need to start the ``celerybeat``
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service. You have to make sure only one instance of this server is running at
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any time, or else you will end up with multiple executions of the same task.
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Vincent Driessen