5.1. Create a New Database and User in MariaDB

This section describes the procedure to create a new database and a new user in MariaDB.

Before we operate on MariaDB, we need to generate a password for this new MariaDB user. To generate a random password, we can run cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w N | head -1, where N is the length of the password. A password with a length of at least 10 is recommended.

Then we need to enter the MariaDB container shell:

ne mariadb

Inside the shell of the MariaDB container, run the following command to start MariaDB shell:

mysql -u root -p

After entering the MariaDB root password, we should now be in the MariaDB shell. Run the following SQL commands, after replacing newuser with the new user’s user name, userhost with the host from which the user connects (if you followed Set up Dnsmasq, this should be simply the name of the container of the Internet app), newdb with the name of the new database to be created, and PASSWORD with the password generated earlier in this section:

GRANT ALL PRIVILEGES ON newdb.* TO 'newuser'@'userhost';

The SQL commands above creates a new user newuser with a password of PASSWORD and a new database newdb, and grants newuser the privilege to perform all operations on the database newdb.

Press Ctrl-D twice to exit the MariaDB shell and the container shell.