Django Logging with FileHandler not Working

Question

I am using the logging setup below with a django project (also using sentry/raven). The sentry/raven bit is working fine, but the file logging isn't. An empty logfile is created, but whenever I use logging.info('foo') nothing comes up in the log file (ie it remains empty). Any suggestions?

LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'root': {
        'level': 'WARNING',
        'handlers': ['sentry'],
    },
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
    },
    'handlers': {
        'sentry': {
            'level': 'ERROR',
            'class': 'raven.contrib.django.handlers.SentryHandler',
        },
        'file': {
            'level': 'INFO',
            'class': 'logging.FileHandler',
            'filename': '/var/log/django/breeding.log',
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose'
        }
    },
    'loggers': {
        'django.db.backends': {
            'level': 'ERROR',
            'handlers': ['console'],
            'propagate': False,
        },
        'raven': {
            'level': 'DEBUG',
            'handlers': ['console'],
            'propagate': False,
        },
        'sentry.errors': {
            'level': 'DEBUG',
            'handlers': ['console'],
            'propagate': False,
        },
    },
}

Answer 1

I ran into this same issue. It turned out to be a permissions problem. When I ran the development server for the first time after configuring logging, it created the file /var/log/django/request.log owned by my local user (stretch) with mode 644.

When I started the "production" server (nginx/uwsgi), the service would run as the www-data user and was unable to open /var/log/django/request.log for writing. Simply deleting the log file and restarting uwsgi was enough to get it going, but I'll have to come up with a more elegant long-term fix.

Answer 2

In order to make it work you have to add the ' file ' handler to each logger, like this:

'loggers': {
    'django.db.backends': {
        'level': 'ERROR',
        'handlers': ['file','console'],
        'propagate': False,
    },
    'raven': {
        'level': 'DEBUG',
        'handlers': ['file','console'],
        'propagate': False,
    },
    'sentry.errors': {
        'level': 'DEBUG',
        'handlers': ['file','console'],
        'propagate': False,
    },
},

Otherwise, the loggers won't write anything to the specified file.

Answer 3

This is a Quick Answer .

---

More complete:

In Django logging setting follow this script:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'formatters': {
        'verbose': {
            'format': '%(levelname)3.3s %(asctime)22.22s [%(name)s:%(funcName)s] {%(process)d} %(message)s'
        }
    },
    'handlers': {
        'sentry-warn': {
            'level': 'WARNING',
            'class': 'raven.contrib.django.raven_compat.handlers.SentryHandler',
        },
        'sentry-info': {
            'level': 'INFO',
            'class': 'raven.contrib.django.raven_compat.handlers.SentryHandler',
        },
        'sentry-error': {
            'level': 'ERROR',
            'class': 'raven.contrib.django.raven_compat.handlers.SentryHandler',
        },
        'console': {
            'level': 'WARNING',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose'
        },
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler',
        }
    },
    'loggers': {
        'sentry': {
            'level': 'DEBUG',
            'handlers': ['sentry-warn', 'console', 'file', 'sentry-info', 'sentry-error'],
            'propagate': False,
        },
        'sentry-warn': {
            'level': 'DEBUG',
            'handlers': ['sentry-warn', 'console', 'file'],
            'propagate': False,
        },
        'sentry-error': {
            'level': 'DEBUG',
            'handlers': ['console', 'file', 'sentry-error'],
            'propagate': False,
        },
        'sentry-info': {
            'level': 'DEBUG',
            'handlers': ['console', 'file', 'sentry-info'],
            'propagate': False,
        },
        'django': {
            'handlers': ['console', 'file', 'mail_admins'],
            'propagate': False,
        },
    },
    'root': {
        'handlers': ['console', 'file', 'mail_admins'],
        'level': 'INFO'
    },
}

Testing:

from logging import getLogger

logger = getLogger('sentry')
log_war = getLogger('sentry-warn')
log_inf = getLogger('sentry-info')
log_err = getLogger('sentry-error')

logger.warning('warn')
logger.info('info')
logger.error('error')

log_err.error('new error') 
log_war.warning('new warn')  
log_inf.info('new info')