supervisord logs don't show my output
Python output is buffered. Setting the environment variable PYTHONUNBUFFERED=1 in you supervisord.conf will disable buffering and show log messages sooner:
[program:x]environment = PYTHONUNBUFFERED=1or add the -u command-line switch to python command:
[program:x]command = python -u file.pyAlternatively you can flush the sys.stdout handler explicitly:
sys.stdout.flush()On python 3.3 and up, you can add the flush=True parameter to have the function do this for you:
print(something, flush=True)
You can run your program like this:
python -u file.pythis will produce unbuffered output
If you have python based script that you can't or don't want to change to flush output on a regular base then you can use unbuffer from the Expect package.
For a Django application in a docker container I've lately used it like that (from a shell script run from supervisord):
unbuffer python -u manage.py runserver 0.0.0.0:11000 2>&1 >> /var/log/django.log