利用django-crontab來佈署系統cron jobs¶

安裝 django-crontab Django application¶

$ pip install django-crontab

settings.py 設定¶

CRONJOBS = [
        ('58 23 * * *', 'family.cron.generate_trans_report_job', '>> %s 2>&1' % os.path.join(_PATH, os.path.pardir, 'family_cronjob.log')),
]

cron function 範例¶

cron job related model:

class Cron_Job_Log(models.Model):
STATUS_CHOICES = (
    ('1', _('cron_job_success')),
    ('2', _('cron_job_failed')),
)
title = models.CharField(max_length=48, default='', verbose_name=_('cron_job_title'))
exec_time = models.DateTimeField(auto_now_add=True, verbose_name=_('cron_job_exec_time'))
status_code = models.CharField(default='1', max_length=1, choices=STATUS_CHOICES, verbose_name=_('cron_job_status'))
def success(self):
    self.status_code = '1'
def failed(self):
    self.status_code = '2'

cron job python function:

logger = logging.getLogger('family.cronjob')
#
#
def generate_trans_report_job():
    translation.activate('zh_TW')
    job = Cron_Job_Log()
    job.title = generate_trans_report_job.__name__
    try:
        #your logic here

    except:
        logger.warning("Error when perform cron job %s" % sys._getframe().f_code.co_name, exc_info=1)
        job.failed()
        # raise again
        raise
    else:
        job.success()
    finally:
        job.save()
        translation.deactivate()

execution
- add the cron jobs to the system crontab:
```
$ python manage.py crontab add
```
- linux command to list system crontab:
```
$ crontab -u your_username -l
```
- linux command to remove system crontab:
```
$ crontab -u your_username -r
```