Get worker id from Gunicorn worker itself

Question

I run multiple gunicorn workers with workers=4 setting. So as I understand I have 5 different processes: one gunicorn master process and 4 other worker processes. Can I get information about which worker is serving request at the moment? So can I get any worker id from inside worker itself like for each request send back a response with content: this request was served by worker:worker_id?

Answer 1

Within a worker code just use

import os
print(os.getpid())

Process id is a good enough identifier for such a case. Another option which is overkill obviously is to create a worker-id-file for each worker at this point https://docs.gunicorn.org/en/stable/settings.html?highlight=hooks#post-worker-init and read from it when needed. Do not forget to remove this file on exit https://docs.gunicorn.org/en/stable/settings.html?highlight=hooks#worker-exit

Answer 2

For debugging purpose, you may use post_request hook to log the worker pid

def post_response(worker, req, environ, resp):
    worker.log.debug("%s", worker.pid)