uWSGI Server log…permission denied to read file…which file?

Question

I have a server running Django/Nginx/uWSGI with uWSGI in emperor mode, and the error log for it (the vassal-level error log, not the emperor-level log) has a continual permi

Answer 1

The actual answer to this question appears to be this Ubuntu-specific bug:

https://bugs.launchpad.net/ubuntu/+source/libjpeg-turbo/+bug/1031718

You can work around the problem by putting the lines

setuid uwsgiuser
setgid uwsgiuser

into your upstart configuration file, and deleting the uid and gid settings from your uwsgi configuration.

Answer 2

You could try to strace the process and see what triggers the error message, something like:

UWSGI=/usr/bin/uwsgi LOGTO=/var/log/uwsgi/emperor.log strace -f -o strace.log -etrace=open,write $UWSGI --master --emperor /etc/uwsgi/vassals --die-on-term --auto-procname --no-orphans --logto $LOGTO --logdate