How do I print accesslog to STDOUT?

[lamroger]

Hi,

http://docs.gunicorn.org/en/stable/settings.html#accesslog is telling me '-' will output to stderr but we prefer STDOUT for logging purposes. Is there a way to do that?

Thanks!

[berkerpeksag]

The relevant line is here: https://github.com/benoitc/gunicorn/blame/master/gunicorn/glogging.py#L335 logging.StreamHandler() defaults to sys.stderr. Perhaps we could change accesslog to accept "stdout" and "stderr" as valid values and pass to logging.StreamHandler().

[berkerpeksag]

Another but less flexible solution:

The console handler already prints to sys.stdout: https://github.com/benoitc/gunicorn/blob/master/gunicorn/glogging.py#L64 We could set the handler to "console" for gunicorn.accesslog as we already did for gunicorn.error in https://github.com/benoitc/gunicorn/blob/master/gunicorn/glogging.py#L55

[benoitc]

I'm confused. Doesn't the StreamHandler already log on sys.stdout?

[berkerpeksag]

No, the default value is sys.stderr: https://github.com/python/cpython/blob/master/Lib/logging/__init__.py#L955

[benoitc]

OK I understand now. Originally we were printing logs to stdout. IMO the access log should default to STDOUT. Thoughts?

[tilgovi]

@benoitc 👍

Access log on stdout
Error log on stderr

[mannysz]

any updates on this request?

[suriya]

@benoitc I am not sure this commit addresses this issue. Let us say I run, gunicorn myapp:app with no additional arguments. Is the expectation that gunicorn should log access records to standard output? If so, gunicorn doesn't do that.

In https://github.com/benoitc/gunicorn/blob/master/gunicorn/glogging.py#L302 without any command line arguments self.cfg.accesslog is None and the function returns early. As far as I can tell, there seems to be no way to log to stdout without specifing --log-config or --log-syslog. Is this correct?

[benoitc]

by default access log is disabled if this is what you mean?

[suriya]

@benoitc Yes. The discussion above seems to indicate that access logs will go to stdout and error logs to stderr. However, it looks like access logging is disabled by default.

BTW, with Python 2.7 I used to be able to do --access-log /dev/stdout --error-log /dev/stderr and that would work. With Python 3, passing /dev/stdout as an argument fails in

gunicorn/gunicorn/util.py

Line 498 in f722a6e

f = open(path, 'a')

[amilstead]

👍 @suriya I think I'm looking for the same behavior you are -- I'd like to run --capture-log and enable --access-logfile=<something>, but I'd prefer my access log lines go to stdout not stderr.

EDIT: To clarify, this appears to just be a problem with Python3. Using python3.5.1, passing --access-logfile=/dev/stdout to gunicorn fails to start the server.