解决办法:
[root@localhost mysql]# vi /etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf
[Service]
ProtectHome=false
[root@localhost mysql]# systemctl daemon-reload
[root@localhost mysql]# vi /etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf
[Service]
ProtectHome=false
[root@localhost mysql]# systemctl daemon-reload
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