CentOS下mysql忘记root密码解决办法,centOS7中Host is not allowed to connect

1，停止mysql服务命令            

systemctl stop mysqld

        2，修改配置文件/etc/my.cnf

            在[mysqld]下添加

           skip-grant-tables

            意思是忽略验证，保存并退出

        3，启动Mysql命令            

systemctl start mysqld

         4，修改密码

            执行命令：mysql

            Welcome to the MySQL monitor. Commands end with ; or g.

            Your MySQL connection id is 3 to server version: 3.23.56
            Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
            mysql> USE mysql ;
            Database changed
            mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ;
            Query OK, 0 rows affected (0.00 sec)
            Rows matched: 2 Changed: 0 Warnings: 0
            mysql> flush privileges ;
            Query OK, 0 rows affected (0.01 sec)

            mysql> quit

        5，改回配置 :删除 /etc/my.cnf 文件中的 skip-grant-tables，重启服务

            systemctl restart mysqld

centOS7中Host is not allowed to connect to this MySQL server解决方法

原因是Centos不允许远程登录mysql

解决办法：

登录 MySQL，执行：mysql -u root -p  (输入密码)
执行： use mysql
执行： update user set host ='%' where user = 'root'; 执行会报错，不影响结果 (如果你不是root登录，修改成你需要的账号)
执行： flush privileges;