===== Install MariaDB =====
To install MariaDB, run the command below;
   # apt-get install mariadb-server mariadb-client
When installed, MariaDB is started and enabled to run on system boot.
   # systemctl is-enabled mariadb
   enabled   
   # systemctl status mariadb
   
   ● mariadb.service - MariaDB 10.3.15 database server
      Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
      Active: active (running) since Thu 2019-07-18 15:31:35 EDT; 9min ago
        Docs: man:mysqld(8)
              https://mariadb.com/kb/en/library/systemd/
    Main PID: 2356 (mysqld)
      Status: "Taking your SQL requests now..."
       Tasks: 31 (limit: 1150)
      Memory: 76.4M
      CGroup: /system.slice/mariadb.service
              └─2356 /usr/sbin/mysqld
After installing MariaDB database server, the commands below can be used to stop, start and enable MariaDB service to always start up when the server boots.
    # systemctl stop mariadb.service
    # systemctl start mariadb.service
    # systemctl enable mariadb.service

==== Database location ====
Database is located at:
    # cd /var/lib/mysql/

==== Check location used config file ====
The location of the used config file can be found by:
   /usr/sbin/mysqld --verbose --help | grep -A 1 "Default options"

==== MariaDB initial Security ====
By default, MariaDB uses unix_socket plugin for authentication and thus, it doesn’t require password to login. You can simply run mysql or mysql -u root to login to MariaDB server.
   # mysql

   Welcome to the MariaDB monitor.  Commands end with ; or \g.
   Your MariaDB connection id is 48
   Server version: 10.3.15-MariaDB-1 Debian 10
   Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
   Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
   MariaDB [(none)]>

You can now run the mysql_secure_installation script to remove MariaDB test databases, anonymous users and disallow remote root login. To run the script, just run the command below
   # mysql_secure_installation

When prompted, answer the questions below by following the guide.

Enter current password for root (enter for none): Just press the Enter
  * Set root password? [Y/n]: Y
  * New password: Enter password
  * Re-enter new password: Repeat password
  * Remove anonymous users? [Y/n]: Y
  * Disallow root login remotely? [Y/n]: Y
  * Remove test database and access to it? [Y/n]:  Y
  * Reload privilege tables now? [Y/n]:  Y
  * Restart MariaDB server

To test if MariaDB is installed, type the commands below to logon to MariaDB server

    # sudo mysql -u root -p

Then type the password you created above to sign on… if successful, you should see MariaDB welcome message

==== Remote Access ====
By default the remote access is disabled. In order to enable remote access make the following changes to the configuration file:
<code>
# nano /etc/mysql/mariadb.conf.d/50-server.cnf

Disabled the line: bind-address = 127.0.0.1. 
#bind-address            = 127.0.0.1

#And add 2 new lines:
skip-networking=0
skip-bind-address
</code>