uwsgi.ini

[uwsgi]
socket = /tmp/uwsgi.sock
chown-socket = nginx:nginx
chmod-socket = 664
# Graceful shutdown on SIGTERM, see https://github.com/unbit/uwsgi/issues/849#issuecomment-118869386
hook-master-start = unix_signal:15 gracefully_kill_them_all

module = run
callable = application

uid = nginx
gid = nginx

env = HOME=/home/nginx

# Python venv
if-env = VIRTUAL_ENV
virtualenv = %(_)
endif =

### Worker scaling
# maximum number of workers
processes = 16

# https://uwsgi-docs.readthedocs.io/en/latest/Cheaper.html#busyness-cheaper-algorithm
cheaper-algo = busyness

# Time window for tracking average busyness
cheaper-overload = 20

# Number of idle cycles before stopping a worker
cheaper-busyness-multiplier = 3

# Minimum number of workers
cheaper = 8

# Start with 8 workers
cheaper-initial = 8

# Spawn at most 8 workers at once
cheaper-step = 8

# Start spawning more workers at 60% busyness
cheaper-busyness-max = 60

# Start killing workers if busyness falls below 20%
cheaper-busyness-min = 20


### Reloads and limitations
# max socket listen queue length - requires net.somaxconn increase
listen = 4096

# Max request header size
buffer-size = 65535

# Don't spawn new workers if total memory over 6 GiB
cheaper-rss-limit-soft = 6442450944

# Reload worker after serving X requests
max-requests = 5000

# Grace period for single worker to reload/shutdown
worker-reload-mercy = 600

# Grace period for all workers and processes to reload/shutdown
reload-mercy = 605

# Kill stuck/unresponsive processes after 20 minutes
harakiri = 1200


### Misc
# Maintain Python thread support
enable-threads = true

# Required for cheaper-rss-limit-soft
memory-report = true

# Additional log output for harakiri
harakiri-verbose = true


### Logging
# Filter our properly pre-formated app messages and pass them through
logger = app stdio
log-route = app ^{.*"source":.*}$

# Capture known / most common uWSGI messages
logger = uWSGIdebug stdio
logger = uWSGIwarn stdio

log-route = uWSGIdebug ^{address space usage
log-route = uWSGIwarn \[warn\]

log-encoder = json:uWSGIdebug {"source":"uWSGI","time":"${strftime:%Y-%m-%dT%H:%M:%S.000Z}","severity":"debug","message":"${msg}"}
log-encoder = nl:uWSGIdebug
log-encoder = json:uWSGIwarn {"source":"uWSGI","time":"${strftime:%Y-%m-%dT%H:%M:%S.000Z}","severity":"warning","message":"${msg}"}
log-encoder = nl:uWSGIwarn

# Treat everything else as error message of unknown origin
logger = unknown stdio

# Creating our own "inverse Regex" using negative lookaheads, which makes this
# log-route rather cryptic and slow... Unclear how to get a simple
# "fall-through" behavior for non-matching messages, otherwise.
log-route = unknown ^(?:(?!^{address space usage|\[warn\]|^{.*"source".*}$).)*$

log-encoder = json:unknown {"source":"unknown","time":"${strftime:%Y-%m-%dT%H:%M:%S.000Z}","severity":"error","message":"${msg}"}
log-encoder = nl:unknown

log-4xx = true
log-5xx = true
disable-logging = true