gunicorn.conf.py

import multiprocessing
import os

workers_per_core_str = os.getenv("WORKERS_PER_CORE", "1")
max_workers_str = os.getenv("MAX_WORKERS")
use_max_workers = None
if max_workers_str:
    use_max_workers = int(max_workers_str)
web_concurrency_str = os.getenv("WEB_CONCURRENCY", None)

host = os.getenv("HOST", "0.0.0.0")
port = os.getenv("PORT", "8000")
use_loglevel = os.getenv("LOG_LEVEL", "info")
use_bind = f"{host}:{port}"

accesslog_var = os.getenv("ACCESS_LOG", "-")
use_accesslog = accesslog_var or None
errorlog_var = os.getenv("ERROR_LOG", "-")
use_errorlog = errorlog_var or None
graceful_timeout_str = os.getenv("GRACEFUL_TIMEOUT", "120")
timeout_str = os.getenv("TIMEOUT", "120")
keepalive_str = os.getenv("KEEP_ALIVE", "5")

cores = multiprocessing.cpu_count()
workers_per_core = float(workers_per_core_str)
default_web_concurrency = workers_per_core * cores
if web_concurrency_str:
    web_concurrency = int(web_concurrency_str)
    assert web_concurrency > 0
else:
    web_concurrency = max(int(default_web_concurrency), 2)
    if use_max_workers:
        web_concurrency = min(web_concurrency, use_max_workers)

# Gunicorn config variables
loglevel = use_loglevel
workers = web_concurrency
bind = use_bind
errorlog = use_errorlog
accesslog = use_accesslog
graceful_timeout = int(graceful_timeout_str)
timeout = int(timeout_str)
keepalive = int(keepalive_str)