[Python] Python error log location

I am developing a python application on flask framework. And I use .wsgi to deploy it. I got confused by error log locations. It looks like Python errors and debug information are put into different log files.

First of all, I specify both access and error log locations in the apache vhost file.

<VirtualHost *:myport>
...
CustomLog /homedir/access.log common
ErrorLog /homedir/error.log
...
</VirtualHost>


I also know there is another apache error log, /var/log/httpd/error_log. My access logs were printed into the right place, /homedir/access.log.

But, error log looks weird. The Python errors, like SyntaxError, uncaught exceptions went to the log file specified in vhost file (/homedir/error.log). But, any log messages generated by python logging module, went to the "default" error log (/var/log/httpd/error_log).

Can anyone explain why this is happening and how to fix it? I want these two logs go to the same place.


Thanks for the comments. Here is the code I set up logger

import logging

# I didn't specify the stream, so it suppose to be stderr
# Don't know why stderr points to apache /var/log/*, rather than my error log

stream_handler = logging.StreamHandler()
formatter = logging.Formatter("%(levelname)s : %(pathname)s:%(lineno)s - %(msg)s")
stream_handler.setFormatter(formatter)

logger = logging.getLogger('foo')
logger.addHandler(stream_handler)
logger.setLevel(logging.DEBUG)


Then, I logged messages in this way.

import logging
logger = logging.getLogger('foo.bar')

logger.debug('Some debug information')


But, the log goes to /var/log/httpd/error_log, rather than the log specified in apache vhost file.

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