I'm trying to stop the Mosquitto broker service on a centos 7 server.
I've stopped the service with
sudo systemctl stop mosquitto.service
then I've disabled it with
sudo systemctl disable mosquitto.service
with ps I still get
/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
if I kill it, it autorestarts automatically and even after a reboot It's still running.
The process is owned by an other user (admin). How can I stop it definitively?
This has nothing to do with mosquitto but how systemd manages its services.
systemctl disable only affects the autostart of the service but a disabled service will still get started if another service depends on it.
Lets say you have got a service mqtt-client depending on mosquitto with e.g. Wants=mosquitto. Every time mqtt-client is started the mosquitto service gets started as well, even if it is disabled.
So one way is either to prevent mqtt-client from starting as well (and all other services which depend on mosquitto) or remove the dependency.
Another approach is to totally prevent the service from being loaded by masking it:
systemctl mask mosquitto - this way you can neither start it manually nor by another service.
I would recommend reworking your dependencies in the long run since masking will just create a symlink to dev/null so nothing happens if service gets loaded and you are not able to start it by yourself without unmasking it first.