Celery beat as daemon

django_celery_beat is extension enables you to store the periodic task schedule in the database, and presents a convenient admin interface to manage periodic tasks at runtime.

Install Extension

see using custom scheduler classes for more information.

Use pip to install the package:

 (kapany_env)$ pip3 install django-celery-beat

Config settings.py:

 # Path to change directory to at start.
 CELERYD_CHDIR="/opt/django_projects/kapany_proj/"
 # django_celery_beat
 INSTALLED_APPS += ['django_celery_beat']

Apply Django database migrations:

 (kapany_env)$ python manage.py migrate
 Running migrations:
 Applying django_celery_beat.0001_initial... OK
 Applying django_celery_beat.0002_auto_20161118_0346... OK
 Applying django_celery_beat.0003_auto_20161209_0049... OK
 Applying django_celery_beat.0004_auto_20170221_0000... OK
 Applying django_celery_beat.0005_add_solarschedule_events_choices_squashed_0009_merge_20181012_1416... OK
 Applying django_celery_beat.0006_periodictask_priority... OK
 (kapany_env)$

Start the celery beat service manual

 (kapany_env)$ celery -A kapany_proj beat -l info --scheduler django_celery_beat.schedulers:DatabaseScheduler
 celery beat v4.2.1 (windowlicker) is starting.
 __    -    ... __   -        _
 LocalTime -> 2019-03-13 09:55:20
 Configuration ->
     . broker -> amqp://guest:**@localhost:5672//
     . loader -> celery.loaders.app.AppLoader
     . scheduler -> django_celery_beat.schedulers.DatabaseScheduler

     . logfile -> [stderr]@%INFO
     . maxinterval -> 5.00 seconds (5s)
 [2019-03-13 09:55:20,161: INFO/MainProcess] beat: Starting...
 [2019-03-13 09:55:20,162: INFO/MainProcess] Writing entries...
 [2019-03-13 09:55:25,320: INFO/MainProcess] Writing entries...

Ctrl + C to stop celery-beat

Visit the Django-Admin interface to set up some periodic tasks.

Create celerybeat configuration file

Create the empty /etc/default/celerybeat configuration file for the init script

  $ sudo touch /etc/default/celerybeat
  $ sudo vim /etc/default/celerybeat

Copy example configuration and paste to /etc/default/celerybeat
Edit the configuration option according to your project.
- project name : kapany_proj
- project directory : /opt/django_projects/kapany_proj/
- project env : /opt/django_projects/kapany_proj/kapany_env/
```
  # Extra arguments to celerybeat
  CELERYBEAT_OPTS="--schedule=django_celery_beat.schedulers:DatabaseScheduler"
```

Create the init script

Create the init script in /etc/init.d/celerybeat.See the extra/generic-init.d/ directory Celery distribution.

# create init script
$ sudo touch /etc/init.d/celerybeat

# edit
$ sudo vim /etc/init.d/celerybeat

# copy and past content from
# https://github.com/celery/celery/blob/3.1/extra/generic-init.d/celerybeat

# executable
$ sudo chmod +x /etc/init.d/celerybeat

Enable Permission

add the celery user to your user group or group which running django server.

$ sudo usermod -a -G celery your_user_group

Verbose the init-scripts

$ sudo sh -x /etc/init.d/celerybeat start
$ sudo sh -x /etc/init.d/celerybeat status
...
+ kill -0 23093
+ [  ]
+ echo celerybeat (pid 23093) is up...
celerybeat (pid 23093) is up...
+ [  ]
+ exit 0
...

Enable the daemon

$ sudo update-rc.d celerybeat defaults
$ sudo service celerybeat start

Remove the daemon

$ sudo update-rc.d -f celerybeat remove
$ sudo rm -f /etc/init.d/celerybeat
$ sudo rm -f /etc/default/celerybeat

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