python watchdog module doesn't work with django/mod_wsgi under redhat server

Question

We use django (1.7.5) with mod_wsgi under apache2 in redhat server, and try to use watchdog to monitor the files.

It works fine locally using python manager.py runserver command, while the event is not triggerred in wsgi mode when I deploy it into product environment

 # wsgi.py from django.core.wsgi import get_wsgi_application application = get_wsgi_application() LOGGER.debug("Starting to watch for config file changes.") fw = FileWatcher()

 # filewatcher path = settings.PROJECT_ROOT filename = 'config.json' class ConfigHandler(FileSystemEventHandler): def on_modified(self, event): if not event.is_directory and event.src_path.endswith(filename): LOGGER.debug("The config has changed!, Reloading") class FileWatcher(object): _instance = None _watching = False def __new__(cls, *args, **kwargs): if not cls._instance: LOGGER.debug("Creating new FileWatcher") cls._instance = super(FileWatcher, cls).__new__(cls, *args, **kwargs) cls.start_watching() return cls._instance @classmethod def start_watching(cls): if not cls._watching: LOGGER.debug("Starting to monitor the file: %s", os.path.join(path, filename)) event_handler = ConfigHandler() observer = Observer() observer.schedule(event_handler, path=path, recursive=False) observer.start() cls._watching = True

Could you share your code how you integrated watchdog into django project locally and with wsgi? From the above code, I can't get where your FileWatcher class initialised and works with views.py. — karjaubayev
– karjaubayev, Commented Jun 16, 2020 at 10:09

Larry Cai · Accepted Answer · 2017-01-11 08:50:15Z

Found the route cause, the default Observer (inotify.InotifyObserver) doesn't work in old redhat server with old linux kernel

It is stated in http://pythonhosted.org/watchdog/api.html#module-watchdog.observers

 inotify.InotifyObserver Linux 2.6.13+ inotify(7) based observer polling.PollingObserver Any fallback implementation

Therefore I changed it to generic one

 from watchdog.observers.polling import PollingObserver # http://pythonhosted.org/watchdog/api.html#module-watchdog.observers observer = PollingObserver()

Collectives™ on Stack Overflow

python watchdog module doesn't work with django/mod_wsgi under redhat server

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related