root@mariadb:~# journalctl -xeu mariadb.service
-- A start job for unit mariadb.service has begun execution.
-- A start job for unit mariadb.service has begun execution.
--
-- The job identifier is 914.
Apr 27 09:52:35 mariadb sh[735]: [103B blob data]
Apr 27 09:52:35 mariadb sh[735]: Fatal error in defaults handling. Program aborted
Apr 27 09:52:35 mariadb mariadbd[738]: [95B blob data]
Apr 27 09:52:35 mariadb mariadbd[738]: Fatal error in defaults handling. Program aborted
Apr 27 09:52:35 mariadb systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit mariadb.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Apr 27 09:52:35 mariadb systemd[1]: mariadb.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit mariadb.service has entered the 'failed' state with result 'exit-code'.
Apr 27 09:52:35 mariadb systemd[1]: Failed to start mariadb.service - MariaDB 11.3.2 database server.root@mariadb:/etc/mysql# id mysql
uid=103(mysql) gid=112(mysql) groups=112(mysql),10000(lxc_shares)
root@mariadb:/etc/mysql# ls -ald /mnt/data/
drwxrwx--- 2 root lxc_shares 0 Apr 26 20:12 /mnt/data/
root@mariadb:/etc/mysql#
root@mariadb:~# ps ax | grep mysql
631 pts/1 S+ 0:00 grep mysql
root@mariadb:~#