uWSGI: --master with --emperor spawns two emperors
uwsgi
Solution
Here is what official documentation says:
The emperor should generally not be run with --master, unless master features like advanced logging are specifically needed.
If you're wondering what `master` option does, here is the answer:
master
uWSGI’s built-in prefork+threading multi-worker management mode, activated by flicking the master switch on. For all practical serving deployments it’s not really a good idea not to use master mode.
So, to summarize:
- Use `--master` for usual uWSGI instance,
- Do not use `--master` for uWSGI Emperor.
Problem
I can see that if I start uwsgi like this: ``` sudo /usr/local/bin/uwsgi --emperor /etc/uwsgi/vassals --uid www --gid www ``` it creates one emperor copy. But if I start it with `--master` additionally (as recommended here), it creates two emperor copies. Does it make sense to use `--master` with `--emperor`? I would say no, but if I run it without that option I get this warning: `*** WARNING: you are running uWSGI without its master process manager ***`