Install mysql Server
  apt install mysql-server
  

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Edit /etc/mysql/mysql.conf.d/mysqld.cnf
  datadir=/mnt/volume-nyc1-01/mysql


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Edit /etc/apparmor.d/tunables/alias
  alias /var/lib/mysql/ -> /mnt/volume-nyc1-01/mysql/,
systemctl restart apparmor


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Benutzer anlegen, Rechte setzen
  mysql -u root -p
  CREATE USER 'benutzername'@'%' IDENTIFIED WITH mysql_native_password BY 'password';
  GRANT ALL PRIVILEGES ON *.* TO 'benutzername'@'%' WITH GRANT OPTION;
  FLUSH PRIVILEGES;