Background A MySQL server stop working. You’re confused as this is a new Virtualmin installation and everything went smooth. You start troubleshooting: # service mariadb status Redirecting to /bin/systemctl status mariadb.service ● mariadb.service – MariaDB database server Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled) Active: inactive (dead) since Tue 2019-03-05 05:12:56 UTC; 3h 43min ago … Continue reading MySQL stops working: InnoDB: Fatal error: cannot allocate memory for the buffer pool