Centos7.5  刚安装的mariadb数据库报错

报错:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

原因一:没有启动数据库

解决方法:    systemctl start mariadb    systemctl enable mariadb

原因二:未知

解决方法:[root@db01 ~]# vim /etc/my.cnf[mysqld]datadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockskip-grant-tables  #在配置文件中加入这一条[root@db01 ~]# systemctl restart mariadb    #重启数据库[root@db01 ~]# mysql  #登录成功Welcome to the MariaDB monitor.  Commands end with ; or \g.Your MariaDB connection id is 2Server version: 5.5.60-MariaDB MariaDB ServerCopyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]>