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== Install ==
=Install=
pip install Celery
==Create Virtual Host and User==
sudo rabbitmqctl add_user <username> <password>
sudo rabbitmqctl add_vhost <vhostname>
sudo rabbitmqctl set_permissions -p <vhostname> <username> ".*" ".*" ".*"
==With RabbitMQ==
sudo apt-get install rabbitmq-server
# Create rabbitmq user
sudo rabbitmqctl add_user myuser mypassword
# Create rabbitmq vhost
sudo rabbitmqctl add_vhost myvhost
sudo rabbitmqctl set_user_tags myuser mytag
sudo rabbitmqctl set_permissions -p myvhost myuser ".*" ".*" ".*"
Starting/Stopping the RabbitMQ server
To start the server:
$ sudo rabbitmq-server
you can also run it in the background by adding the -detached option (note: only one dash):
$ sudo rabbitmq-server -detached
Never use kill to stop the RabbitMQ server, but rather use the rabbitmqctl command:
$ sudo rabbitmqctl stop
=Workers=
==Launch==
celery -A {ProjectName} worker -l info --queues=queuename1,queuename2
== SystemD ==
=== Service File ===
<syntaxhighlight lang="bash">
[Unit]
Description=CIA Celery Scheduler
After=network.target
[Service]
User=tenkaichi
Group=tenkaichi
EnvironmentFile=/etc/default/celerybeat
WorkingDirectory=/home/tenkaichi/CIA
ExecStart=/bin/sh -c '${CELERY_BIN} -A ${CELERY_APP} beat --loglevel=${CELERYBEAT_LOGLEVEL} --scheduler=${CELERYBEAT_SCHEDULER} --logfile=${CELERYBEAT_LOG_FILE}'
Restart=always
RestartSec=3
[Install]
WantedBy=multi-user.target
</syntaxhighlight>
=== /etc/default/celerybeat ===
<syntaxhighlight lang="bash">
CELERY_BIN="/home/tenkaichi/.virtualenvs/cia/bin/celery"
CELERY_APP="CIA"
CELERYBEAT_CHDIR="/home/tenkaichi/CIA"
CELERYBEAT_SCHEDULER="django_celery_beat.schedulers:DatabaseScheduler"
CELERYBEAT_OPTS=""
CELERYBEAT_LOGLEVEL=debug
CELERYBEAT_LOG_FILE="/home/tenkaichi/CIA/logs/celery_beat.log"
DJANGO_SETTINGS_MODULE="CIA.settings"
</syntaxhighlight>
==Run task at specific time==
<source lang="Python">import datetime
import celery
@celery.shared_task(bind=True)
def add_tag(task, user_id, tag):
User.objects.filter(id=user_id, tags__ne=tag).update(push__tags=tag)
return True
user_id = '582ee32a5b9c861c87dc297e'
tag = 'new_tag'
started_at = datetime.datetime(2018, 3, 12, tzinfo=datetime.timezone.utc)
add_tag.apply_async((user_id, tag), eta=started_at)</source>
https://vinta.ws/code/run-a-celery-task-at-a-specific-time.html