root@I152:~# systemctl status mariadb.service
● mariadb.service - MariaDB 10.2.27 database server
   Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           └─migrated-from-my.cnf-settings.conf
   Active: failed (Result: exit-code) since Mon 2019-10-21 06:13:21 CDT; 37s ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/
  Process: 1305 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
  Process: 1300 ExecStartPost=/etc/mysql/debian-start (code=exited, status=0/SUCCESS)
  Process: 11106 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)
  Process: 11093 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_P
  Process: 11089 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
  Process: 11083 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
 Main PID: 11106 (code=exited, status=1/FAILURE)
   Status: "MariaDB server is down"

Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [Note] InnoDB: Starting shutdown...
Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [ERROR] Plugin 'InnoDB' init function returned error.
Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [Note] Plugin 'FEEDBACK' is disabled.
Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [ERROR] Unknown/unsupported storage engine: InnoDB
Oct 21 06:13:21 I152 mysqld[11106]: 2019-10-21  6:13:21 140398860073152 [ERROR] Aborting
Oct 21 06:13:21 I152 systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
Oct 21 06:13:21 I152 systemd[1]: Failed to start MariaDB 10.2.27 database server.