Installing uwsgi via apt in Ubuntu 22.04 creates all necessary config files for systemd. /run/systemd/generator.late/uwsgi.service calls /etc/init.d/uwsgi to start/stop the service, which in turn reads the configured apps from /etc/uwsgi/apps-enabled/.

So far, so good, but I fail to see

• why the file in /etc/init.d/ is created (and called by /run/systemd/generator.late/uwsgi.service) instead of having a systemd configuration file in /etc/systemd/system/)
• when the existing service files /lib/systemd/system/[email protected] and /lib/systemd/system/[email protected] are read/used, and
• why /lib/systemd/system/[email protected] refers to configured apps in /etc/uwsgi/apps-available/ instead of /etc/uwsgi/apps-enabled/.

I was under the impression that /etc/init.d/ dates back to SysVInit, which was superseded by systemd, and the combination of configuration files from both approaches is quite confusing.