SHELL

prevent mysql from running on every boot or restart

cd /etc/init
nano mysql.conf
comment out the "start on" line near the top of the file by adding a #
	e.g
    #start on runlevel [2345]
    
  run the following to start the server at any time
service mysql start

prevent mysql from running on every boot or restart

sudo systemctl disable mysql

 # to revert
sudo systemctl enable mysql
sudo systemctl start mysql