How do I restart celery workers gracefully?

Question

While issuing a new build to update code in workers how do I restart celery workers gracefully?

Edit: What I intend to do is to something like this.

• Worker is running, probably uploading a 100 MB file to S3
• A new build comes
• Worker code has changes
• Build script fires signal to the Worker(s)
• Starts new workers with the new code
• Worker(s) who got the signal after finishing the existing job exit.

Answer 1

According to https://docs.celeryproject.org/en/master/userguide/workers.html#restarting-the-worker you can restart a worker by sending a HUP signal

 ps auxww | grep celeryd | grep -v "grep" | awk '{print $2}' | xargs kill -HUP