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File: /home/prodcxja/public_html/questions/application/views/question.php
Line: 191
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
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Function: view

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Function: require_once

With my Procfile like this:

web: gunicorn app:app \
    --bind "$HOST:$PORT" \
    --debug --error-logfile "-" \
    --enable-stdio-inheritance \
    --reload \
    --log-level "debug" 

is it in any way possible to get python print statements to be logged to stdout / bash? I am using the bottle framework here as well, if that affects anything.

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    • The debug flag doesn't apply to gunicorn. It actually fails if you try to run it: gunicorn: error: unrecognized arguments: --debug

It turns out the print statements were actually getting through, but with delay.

The gunicorn docs for --enable-stdio-inheritance note to set the PYTHONUNBUFFERED, which I thought I had, but it seems with wrong syntax.

I solved it using a .env file with my foreman setup to set the variable like this:

  • 23
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In python 3, adding flush=True in each print statement works for my flask/gunicorn app.


gunicorn --bind server --log-level debug

No particular flags are required.

See if this helps.

  • 22
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Please try below command:

gunicorn --workers 3 --bind --error-logfile /var/log/gunicorn/error.log --access-logfile /var/log/gunicorn/access.log --capture-output --log-level debug

It did work for me.

Please specify log-level to debug(default info)http://docs.gunicorn.org/en/stable/settings.html#loglevel,

Also, specify capture-output flag (default false)http://docs.gunicorn.org/en/stable/settings.html#capture-output.

You should be able to watch logs in error log file.

  • 9
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I use Python3 along with Flask.

I use print('log info') directly instead of print('log info', flush=True).

I only set capture_output to True and set a errorlog file and it works.

Note that:


Redirect stdout/stderr to specified file in errorlog

I think it's that you need to specifiy a errorlog file to get the standard output.

Here's my config file gunicorn.config.py setting

accesslog = 'gunicorn.log'
errorlog = 'gunicorn.error.log'
capture_output = True

Then run with gunicorn app_py:myapp -c gunicorn.config.py

The equivaluent command line would be

gunicorn app_py:myapp --error-logfile gunicorn.error.log --access-logfile gunicorn.log --capture-output

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