How to write to log in python with nginx + uwsgi

Question

I have a server running nginx + UWSGI + python. UWSGI is running as a daemon with the flag set: --daemonize /var/log/uwsgi.log which logs all application errors.

I've noticed that on error if I use a python print statement it will write to the log but only on an error. The standard python logging library doesn't seem to affect the log in any situation.

How do I point the python logging libraries to use the UWSGI log?

Solution 1

use logging.StreamHandler as logging handler

Solution 2

uWSGI is a wsgi server, and as such passes a stream in the environ dict passed to the application callable it hosts, using the key wsgi.errors. If you are writing a bare wsgi app, then writing to that stream should do the job. If you are using a framework that abstracts the wsgi interface out (and by the sound of it, you are, print would ordinarily write to sys.stdout, which gets closed on a daemonized process and would never make it to any log file), you will probably need to look into how that framework handles error logging.

Comments

[elkelk]

Although your answer was not detailed, it led me down the right path. This answer describes the method I used: stackoverflow.com/questions/1383254/…

[Michel Müller]

@elkelk: Could you extend? I don't need the filters and tried to log with this method - it still doesn't print anything into the file.

[msgre]

I have similar problem but in regards with Docker containers. Take a look at stackoverflow.com/questions/35511839/…