How to stop mysqld process?

/etc/init.d/mysql stop
service mysql stop
killall -KILL mysql mysqld_safe mysqld

When you see the following information, you success

mysql: no process found
mysqld_safe: no process found
mysqld: no process found

I use this to solve the installation problem of MySQL 5.6 in Ubuntu 15.10 using this link.

During this installation, I encounter the problem saying:

mysqld_safe A mysqld process already exists

Just completely stop the mysqld, mysqld_safe, mysql solves the problem

The mysql Upstart configuration has the respawn option:

$ grep respawn /etc/init/mysql.conf
respawn
respawn limit 2 5
        elif echo $statusnow | grep -q 'respawn/' ; then

The respawn option tells Upstart to restart the process if it exits or is killed. The limit is 2, so you can try killing of the processes twice, which will tell Upstart not to start them again, or use:

sudo service mysql stop

Run sudo /etc/init.d/mysql stop