celery -A tasks worker --loglevel=info  # run the worker

celery worker --help  # list command-line options available

celery multi start w1 -A proj -l info  # start one or more workers in the background

celery multi restart w1 -A proj -l info  # restart workers

celery multi stop w1 -A proj -l info  # stop workers aynchronously

celery multi stopwait w1 -A proj -l info  # stop after executing tasks are completed

celery multi start w1 -A proj -l info --pidfile=/var/run/celery/%n.pid --logfile=/var/log/celery/%n%I.log  # create pid and log files in the current directory