Install MySql

sudo apt-get install mysql-server

sudo service mysql start

sudo ufw allow 3306/tcp

sudo nano /etc/mysql/mysql.conf.d/mysqld.cnf
bind-address = 0.0.0.0
Save (ctrl + o then ctrl+x) and restart MySql Server.

sudo service mysql restart

sudo mysql -u root

mysql> CREATE USER 'username'@'%' IDENTIFIED BY 'xxxxxxxx';
mysql> GRANT ALL PRIVILEGES ON * . * TO 'username'@'%';
mysql> FLUSH PRIVILEGES;