Gunicorn: Gunicorn doesn't print access log to stdout/stderr

I'm using Gunicorn with Amazon ECS and --access-logfile - works exactly as documented; it prints the accesslog to stderr.

closing issue as "work as documented". Feel free to open a new one if you want to discuss a possible change of the current behaviour.

Hi! I hope this is the proper place to ask about it; I'm using gunicorn (v19.7.1) and failing at finding logs in stdoutput. The command, as I understand the documentation is:

gunicorn -b 0.0.0.0:6007 --access-logfile - --error-logfile - --log-level debug 'wsgi:load_application()' 

Then, when I make any http request to the application I cannot see any log in the gunicorn terminal (although the application is responding properly to the request).
I've also tried with export PYTHONUNBUFFERED with same result.

Am I using gunicorn wrong? Could anyone provide a hint? Thanks in advance!!

@yamila-moreno I just tried the command you pasted with examples/test.py and I was able to see access logs in the terminal:

$ gunicorn -b 0.0.0.0:6007 --access-logfile - --error-logfile - --log-level debug test:app
[2018-03-22 17:42:29 +0300] [24642] [DEBUG] Current configuration:
[...snipped...]
[2018-03-22 17:42:29 +0300] [24642] [INFO] Starting gunicorn 19.7.1
[2018-03-22 17:42:29 +0300] [24642] [DEBUG] Arbiter booted
[2018-03-22 17:42:29 +0300] [24642] [INFO] Listening at: http://0.0.0.0:6007 (24642)
[2018-03-22 17:42:29 +0300] [24642] [INFO] Using worker: sync
[2018-03-22 17:42:29 +0300] [24645] [INFO] Booting worker with pid: 24645
[2018-03-22 17:42:29 +0300] [24642] [DEBUG] 1 workers
[2018-03-22 17:42:32 +0300] [24645] [DEBUG] GET /
127.0.0.1 - - [22/Mar/2018:17:42:32 +0300] "GET / HTTP/1.1" 200 14 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36"
[2018-03-22 17:42:33 +0300] [24645] [DEBUG] GET /favicon.ico
127.0.0.1 - - [22/Mar/2018:17:42:33 +0300] "GET /favicon.ico HTTP/1.1" 200 14 "http://0.0.0.0:6007/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36"
[2018-03-22 17:42:39 +0300] [24645] [DEBUG] GET /
127.0.0.1 - - [22/Mar/2018:17:42:39 +0300] "GET / HTTP/1.1" 200 14 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36"
[2018-03-22 17:42:40 +0300] [24645] [DEBUG] GET /favicon.ico
127.0.0.1 - - [22/Mar/2018:17:42:40 +0300] "GET /favicon.ico HTTP/1.1" 200 14 "http://0.0.0.0:6007/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36"

@berkerpeksag thanks for your answer. I was hoping I just misunderstood the documentation. At least I can stop looking there, and find the error in another place. When (if) I finally find the solution, I'll paste here, so it may be useful for someone.

@berkerpeksag sorry for bothering with this, but could you paste also the first part of your gunicorn command? the part "...snipped..."; I'd like to check if there is anything different that I could use as a hint.

thanks!!

Here it is:

  keepalive: 2
  pidfile: None
  config: None
  keyfile: None
  enable_stdio_inheritance: False
  threads: 1
  preload_app: False
  initgroups: False
  worker_abort: <function WorkerAbort.worker_abort at 0x7fd287b241e0>
  post_request: <function PostRequest.post_request at 0x7fd287b24620>
  nworkers_changed: <function NumWorkersChanged.nworkers_changed at 0x7fd287b24ae8>
  cert_reqs: 0
  statsd_prefix: 
  ssl_version: 2
  suppress_ragged_eofs: True
  ciphers: TLSv1
  worker_connections: 1000
  max_requests: 0
  on_exit: <function OnExit.on_exit at 0x7fd287b24c80>
  timeout: 30
  chdir: /home/berker/projects/gunicorn/examples
  raw_env: []
  group: 1000
  forwarded_allow_ips: ['127.0.0.1']
  accesslog: -
  capture_output: False
  pre_exec: <function PreExec.pre_exec at 0x7fd287b24378>
  worker_tmp_dir: None
  post_fork: <function Postfork.post_fork at 0x7fd287b1cc80>
  secure_scheme_headers: {'X-FORWARDED-PROTOCOL': 'ssl', 'X-FORWARDED-SSL': 'on', 'X-FORWARDED-PROTO': 'https'}
  default_proc_name: test:app
  worker_int: <function WorkerInt.worker_int at 0x7fd287b24048>
  errorlog: -
  loglevel: debug
  syslog_prefix: None
  syslog_facility: user
  on_starting: <function OnStarting.on_starting at 0x7fd287b1c620>
  worker_exit: <function WorkerExit.worker_exit at 0x7fd287b24950>
  paste: None
  backlog: 2048
  sendfile: None
  user: 1000
  workers: 1
  syslog_addr: udp://localhost:514
  limit_request_fields: 100
  statsd_host: None
  proc_name: None
  check_config: False
  when_ready: <function WhenReady.when_ready at 0x7fd287b1c950>
  child_exit: <function ChildExit.child_exit at 0x7fd287b247b8>
  proxy_protocol: False
  limit_request_field_size: 8190
  raw_paste_global_conf: []
  reload: False
  spew: False
  ca_certs: None
  proxy_allow_ips: ['127.0.0.1']
  limit_request_line: 4094
  reload_engine: auto
  daemon: False
  umask: 0
  tmp_upload_dir: None
  logger_class: gunicorn.glogging.Logger
  pre_fork: <function Prefork.pre_fork at 0x7fd287b1cae8>
  post_worker_init: <function PostWorkerInit.post_worker_init at 0x7fd287b1ce18>
  worker_class: sync
  pre_request: <function PreRequest.pre_request at 0x7fd287b24510>
  logconfig: None
  do_handshake_on_connect: False
  max_requests_jitter: 0
  certfile: None
  graceful_timeout: 30
  bind: ['0.0.0.0:6007']
  on_reload: <function OnReload.on_reload at 0x7fd287b1c7b8>
  access_log_format: %(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"
  pythonpath: None
  syslog: False

Hi there!! @berkerpeksag thanks for your help. I realised that the problem was the configuration with the logging package.
Then I found this post which helped me to configure this properly.

@berkerpeksag @benoitc Hey guys, is there a way to disable the current configuration from being printed out when on DEBUG log level? (similar to the snipped section above).

FYI, if you use logging.config.fileConfig() or logging.config.dictConfig(), then you should set disable_existing_loggers to False. If it's True, it will disable gunicorn logger. For detail please see Logging HOWTO — Python 3.8.1rc1 documentation.

@dave4jr nope, why?

I'm using Gunicorn with Amazon ECS and --access-logfile - works exactly as documented; it prints the accesslog to stderr.

@romabysen interesting. Do you still have the command?

I'm using the container with my gunicorn in ecs, and I have a startup.sh in docker file with this command to start the server, but it's not delivering the log to stdout.

This is my dockerfile:

This is the server :

@msoedov did you find the solution to print the log in stdout using the containerized gunicorn?