polkitd
 

I just statlled centos 7.5 .

and found that a mysqld process run by polkitd , I tried kill this process , but found that another mysqld process will be generated , even stopped polkitd service , this process is still running .

Just wonder why this mysqld process cannot be killed , the polkitd is to keep the process running ?

thanks

polkitd isn't a mysqld process. for an explanation.

Look at Post by coredump. He gives a good explanation of /proc/<pid>. It should help you identify what is starting mysqld.

most probably mysqld is a service and configured that way (=auto restart if died).
So you need to stop the service instead of killing the process.
But I'm not really sure if that was a good idea.