安装后，我运行systemctl enable mysqld.service. 然后，输出是：
Failed to execute operation: Too many levels of symbolic links
出现此错误后，我重新启动了我的服务，并检查了 mysqld.service 的状态。 systemctl status mysqld.service -l
输出是
? mariadb.service - MariaDB database server
Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/mariadb.service.d
??migrated-from-my.cnf-settings.conf
Active: active (running) since Tue 2017-05-16 13:41:06 UTC; 8min ago
Process: 1930 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
Process: 767 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= || VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ] && systemctl set-environment …