Configuring root logger in python

Question

I have the following logging configuration in in my Django settings.

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format':
              '%(levelname)s|%(asctime)s|%(name)s>> %(message)s',
        },
    },
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose',
        }
    },
    'loggers': {
         '': {
            'handlers': ['console'],
            'level': 'ERROR',
            'propagate': True,
         },
        'apps': {
            'handlers': ['console'],
            'level': 'DEBUG',
        },
    }
}

With this configuration I expect my 'apps' to log at DEBUG level and any other modules to log only ERROR and above. But I see DEBUG messages from other modules. How do I fix it?

Rafa Viotti · Accepted Answer · 2014-01-09 15:41:28Z

11

Are you using an empty string key in LOGGING['loggers'] to match the root logger? If so, you could try this instead.

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format':
              '%(levelname)s|%(asctime)s|%(name)s>> %(message)s',
        },
    },
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose',
        }
    },
    'loggers': {
        'apps': {
            'handlers': ['console'],
            'level': 'DEBUG',
        }
    },
    'root': {
       'handlers': ['console'],
       'level': 'ERROR'
    }
}

answered Jan 9, 2014 at 15:41

Rafa Viotti

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6 Comments

Chamindu Over a year ago

I tried this but it did not work. Still seeing DEBUG messages from other modules.

Quentin Pradet Over a year ago

@Chamindu did you try changing '' to 'root' instead of moving it out of loggers? (I'm a bit late to the party, sorry!)

Chamindu Over a year ago

I did not try it. This was from a long time back I don't even remember where i tried to do this :)

Teddy Markov Over a year ago

I set the root and it helped. But actually I cannot explain to myself why does root has to be configured? I mean what's its purpose.

sox supports the mods Over a year ago

I had the opposite problem: using 'root' it showed only WARNING and above, while setting it to the empty string showed also DEBUG and INFO messages.

|

PalmChou · Accepted Answer · 2018-12-27 02:35:10Z

1

I had a similar issue, with root logger configured a level at INFO but seeing DEBUG log message.

Turns out I should not set 'propagate': True for my other logger which is at level DEBUG, since that those logs will be passed to the root logger no matter what level root at.

So my guess here to the original question is that there might be some other modules' logger with propagate turned on. set disable_existing_loggers to True maybe solve this.

answered Dec 27, 2018 at 2:35

PalmChou

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