MariaDB

EASY BACKUP

1.
$ mysqldump -u root -p –all-databases > db.sql
$ mysql -u root -p db < db.sql
$ du -sh db.sql

2. 
$ dnf -y install mariadb-backup 
$ mariabackup --backup --target-dir /home/backup -u root -p password 

Find config files

$ locate my.cnf
$ whereis my.cnf
$ find / -name my.cnf

$ mysql --help --verbose | grep "my.cnf"
or
$ mysqld --help --verbose | grep "my.cnf"

Default options are read from the following files in the given order:
/etc/my.cnf
/etc/mysql/my.cnf
/usr/etc/my.cnf
~/.my.cnf

etc/my.cnf
/etc/mysql/my.cnf
$MYSQL_HOME/my.cnf
[datadir]/my.cnf
~/.my.cnf

SYSTEMCTL MARIADB

$ systemctl stop mariadb 
$ systemctl start mariadb 
$ systemctl restart mariadb 

INIT SECURE DB

$ mysql_secure_installation

CREATE NEW USER|GRANT ALL PRIVILEGES

mysql> CREATE USER 'newuser'@'%' IDENTIFIED BY 'password'; 
mysql> CREATE USER 'newuser'@'[IP|DOMAIN]' IDENTIFIED BY 'password'; 
mysql> CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; 

mysql> GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost'; 
mysql> FLUSH PRIVILEGES;