Error logging with nginx and uWSGI

Prior to now, all the django projects I’ve worked on have used apache
and WSGI. With those, when an error occurred I went to
/var/log/httpd/error_log and details of the error were clearly there.

Now for the first time I am working on a project using nginx and
uWSGI. Here, the /var/log/nginx/error_log is always empty. And the
uWSGI logs have some messages, but nothing about any errors. In this
setup where would I go to find the errors that
/var/log/httpd/error_log logs? Is there some config setting that is
suppressing the nginx errors?

Hello!

On Fri, May 01, 2015 at 12:04:51PM -0400, Larry M. wrote:

Prior to now, all the django projects I’ve worked on have used apache
and WSGI. With those, when an error occurred I went to
/var/log/httpd/error_log and details of the error were clearly there.

Now for the first time I am working on a project using nginx and
uWSGI. Here, the /var/log/nginx/error_log is always empty. And the
uWSGI logs have some messages, but nothing about any errors. In this
setup where would I go to find the errors that
/var/log/httpd/error_log logs? Is there some config setting that is
suppressing the nginx errors?

The uwsgi protocol doesn’t include an error stream from an
application to nginx. That is, if you are looking for errors
generated by your application, you should look into uWSGI logs.

Own nginx logs can be controlled using the error_log directive,
see http://nginx.org/r/error_log. But I suspect it’s not what are
you looking for, see above.


Maxim D.
http://nginx.org/

Hello!

On Tue, May 05, 2015 at 08:08:42AM -0400, Larry M. wrote:

uWSGI. Here, the /var/log/nginx/error_log is always empty. And the
see http://nginx.org/r/error_log. But I suspect it’s not what are
you looking for, see above.

When my app has, for example, a syntax error, then yes, that appears
in the uWSGI log. But what I was talking about are the HTTP errors
like a 500 or a 400. When I get those there’s nothing in the logs.

If an error is returned by your application and/or uWSGI, then its
reasons are expected to be in your application logs (or the uWSGI
logs).

If an error is returned by nginx (e.g., because a client sent an
invalid request and nginx returned 400), then reasons should be in
nginx error log. Client-related errors, though, are usually
logged at the “info” level, and won’t be visible in error log by
default, see http://nginx.org/r/error_log.

Note well that nginx error logs are highly customizeable, and it
is possible that you are looking into a wrong file. In
particular, please note that default error log can be redefined
during compilation (see “nginx -V” output to find out which one is
used by default), and can also be redefined on a per-server or a
per-location basis (check your configs to find out if it’s the
case).


Maxim D.
http://nginx.org/

On Sun, May 3, 2015 at 8:18 AM, Maxim D. [email protected] wrote:

uWSGI logs have some messages, but nothing about any errors. In this
you looking for, see above.
When my app has, for example, a syntax error, then yes, that appears
in the uWSGI log. But what I was talking about are the HTTP errors
like a 500 or a 400. When I get those there’s nothing in the logs.

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