How i can reset mariadb?

General system Newbie
5

now after i install with sudo pacman -S mariadb mariadb-clients mariadb-libs
i use this command sudo mariadb-install-db --user=mysql --basedir=/usr --datadir=/var/lib/mysql but my next step is sudo mysql_secure_installation where i see this message:

Enter current password for root (enter for none): 
ERROR 2002 (HY000): Can't connect to local server through socket '/run/mysqld/mysqld.sock' (2)
Enter current password for root (enter for none):