How Can I Add to Django's Default Logging? - django

Question

I'm using Django 1.6 and would like to add to—not replace—Django's default logging. Specifically, I want to make it so that in addition to Django's default logging behavior, any log record with a log level of DEBUG or higher gets written to a log file that gets automatically rotated.
Based on what I've found through searches and my own experimenting, it seems like you have to redefine all of the logging (Django's defaults plus my rotating file logging), even when using 'disable_existing_loggers': False. I figure I'm probably doing something wrong.
I'd like to see an example of what to put in my settings.py file that will allow me to accomplish this.

Answer 1

settings.py is just Python, so we can do:
from django.utils.log import DEFAULT_LOGGING
# Use defaults as the basis for our logging setup
LOGGING = DEFAULT_LOGGING
# We need some formatters. These ones are from the docs.
LOGGING['formatters'] = {
'verbose': {
'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
},
'simple': {
'format': '%(levelname)s %(message)s'
},
}
# A log file handler that rotates periodically
LOGGING['handlers'].update({
'rotate': {
'level': 'DEBUG',
'class': 'logging.handlers.RotatingFileHandler',
'formatter': 'verbose',
'filename': '/tmp/debug.log',
}
})
# The default 'django' logger is a catch-all that does nothing. We replace it with
# a rotating file handler.
LOGGING['loggers'].update({
'django': {
'handlers': ['rotate'],
'propagate': True,
'level': 'DEBUG',
}
})
# If you don't want to completely replace the django handler, you could do something
# like this instead:
#LOGGING['loggers']['django']['handlers'] += ['rotate']
This will add your rotating file handler to the existing handlers, define the basic formatters, and replace the catch-all logger (which does nothing) with one that replace the default logger

Answer 2

Based on your comments I tried this. It seems to do what you're asking.
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'handlers': {
'rotate': {
'level': 'DEBUG',
'class': 'logging.handlers.RotatingFileHandler',
'filename': '/tmp/debug.log',
}
},
'loggers': {
'django': {
'handlers': ['rotate'],
'propagate': True,
'level': 'DEBUG',
}
},
}