安装后，我运行systemctl enable mysqld.service 。 那么，输出是：
Failed to execute operation: Too many levels of symbolic links
在这个错误之后，我重启我的服务，然后检查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`; [ $? -eq 0 ] && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS) Process: 743 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS) Main PID: 813 (mysqld) Status: "Taking your SQL requests now..." CGroup: /system.slice/mariadb.service └─813 /usr/sbin/mysqld May 16 13:41:05 hostname mysqld[813]: 2017-05-16 13:41:05 140294373226752 [Note] InnoDB: Highest supported file format is Barracuda. May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] InnoDB: 128 rollback segment(s) are active. May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] InnoDB: Waiting for purge to start May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.35-80.0 started; log sequence number 1616859 May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140293647075072 [Note] InnoDB: Dumping buffer pool(s) not yet started May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] Plugin 'FEEDBACK' is disabled. May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] Server socket created on IP: '::'. May 16 13:41:06 hostname mysqld[813]: 2017-05-16 13:41:06 140294373226752 [Note] /usr/sbin/mysqld: ready for connections. May 16 13:41:06 hostname mysqld[813]: Version: '10.1.23-MariaDB' socket: '/var/lib/mysql/mysql.sock' port: 3306 MariaDB Server May 16 13:41:06 hostname systemd[1]: Started MariaDB database server.
无论如何要解决这个问题？
谢谢！
删除/etc/systemd/system的mysqld.service符号链接并再次启用mysqld.service ：
rm /etc/systemd/system/mysqld.service systemctl enable mysqld.service