Add a Rotating Log to your Django Project

Use the RotatingFileHandler a log handler that comes with Python

In your django settings file:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'file': {
            'level': 'DEBUG',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': os.path.join(BASE_DIR, 'debug.log'),
            'maxBytes': 1024 * 1024 * 15, # 15MB
            'backupCount': 10,
        },
    },
    'loggers': {
        'django': {
            'handlers': ['file', ],
            'level': 'INFO',
            'propagate': True,
        },
    },
}

Source: