uWSGI: --master with --emperor spawns two emperors

Question

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 empero

Answer 1

I'd like to add some specific information for using harakiri mode for vassals running under emperor. If master is not also in the config for the vassals harakiri will have no effect regardless of whether master/harakiri is specified in the emperor config. Given an example emperor config:

[uwsgi]
emperor = ...
daemonize = ...
emperor-pidfile = ...
vassal-set = enable-metrics=1
emperor-stats = 127.0.0.1:6000

The vassals will need the following for harakiri to work:

[uwsgi]
strict
processes = 4
stats = 127.0.0.1:5000
memory-report
daemonize = ...
pidfile = ...
close-on-exec
py-tracebacker = /tmp/tbsocket
master
harakiri = 5
harakiri-verbose

Note that master and harakiri are both present in the vassal and setting them in emperor config would have no effect on the vassals for uwsgi version 2.0.12