Kronos makes it really easy to schedule tasks with cron.
$ pip install django-kronos
... and add kronos to INSTALLED_APPS.
Kronos collects tasks from cron modules in your project root and each of your applications:
# app/cron.py import kronos import random @kronos.register('0 0 * * *') def complain(): complaints = [ "I forgot to migrate our applications's cron jobs to our new server! Darn!", "I'm out of complaints! Damnit!" ] print random.choice(complaints)
If you have a task in a Django Command you can register it doing:
# app/management/commands/task.py from django.core.management.base import NoArgsCommand import kronos @kronos.register('0 0 * * *') class Command(NoArgsCommand): def handle_noargs(self, **options): print('command task')
Run tasks manually
$ python manage.py runtask complain I forgot to migrate our applications's cron jobs to our new server! Darn!
Keep in mind that if the registered task is a django command you have to run it in the normal way:
$ python manage.py task
List all registered tasks
$ python manage.py showtasks * List of tasks registered in Kronos * >> Kronos tasks >> my_task_one >> my_task_two >> Django tasks >> my_django_task
Register tasks with cron
$ python manage.py installtasks Installed 1 task.
You can review the crontab with a crontab -l command:
$ crontab -l 0 0 * * * /usr/bin/python /path/to/manage.py runtask complain --settings=myprpoject.settings $KRONOS_BREAD_CRUMB 0 0 * * * /usr/bin/python /path/to/manage.py task --settings=myprpoject.settings $KRONOS_BREAD_CRUMB
Usually this line will work pretty well for you, but there can be some rare cases when it requires modification. You can achieve it with a number of settings variables used by kronos:
- Python interpreter to build a crontab line (defaults to the interpreter you used to invoke the management command).
- Management command to build a crontab line (defaults to manage.py in the current working directory).
- Extra path which will be added as a --pythonpath option to the management command.
- Extra string added at the end of the command. For dirty thinks like '> /dev/null 2>&1'
Define these variables in your settings.py file if you wish to alter crontab lines.
The env variable $KRONOS_BREAD_CRUMB is defined to detect which tasks have to be deleted after being installed.
- Fork the repository.
- Do your thing.
- Open a pull request.
- Receive cake.
I love you
Johannes Gorset made this. You should tweet me if you can't get it to work. In fact, you should tweet me anyway.