Arch Linux

When using UNIX sockets in listen directives, Nginx fails on restarts with "[emerg] 2865#2865: bind() to unix:/run/nginx-example.net.sock failed (98: Address already in use)"

Sample config:

server {
listen unix:/run/nginx-example.net.sock;
...
}

The reason for this is using
KillSignal=SIGQUIT
in nginx systemd service file (where master process doesn't clean up its sockets)

While it would suffice to use the default SIGTERM.

Two other points:
* 'KillMode=mixed' already sends SIGTERM signal to main process and SIGKILL to other processes in the control group
* If SIGTERM fails, the termination request is repeated with SIGKILL

https://www.freedesktop.org/software/systemd/man/systemd.kill.html