2019-03-23－初次使用mysql数据库安装，用户名和密码等问题

mysql问题

mysql安装

wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql-community-server
systemctl start mysqld.service
yum -y remove mysql57-community-release-el7-10.noarch

mysql初始密码查找

grep "password" /var/log/mysqld.log

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修改初始密码

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';

授予权限

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mysql远程连接

问题：
ERROR 1130 (HY000): Host '223.87.33.93' is not allowed to connect to this MySQL server
解决办法:
update user set host = '%' where user = 'root';
flush privileges;

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忘记密码处理：

• vim /etc/my.cnf, 在mysqld增加skip-grant-tables
• 重启mysql服务
• 登陆mysql
• 修改密码：

1. use mysql;
2. update user set authentication_string=password('root') where User='root';
3. flush privileges;
4. quit

• 或者授权
  此处省略1000字
• 删除skip-grant-tables配置
• 重启mysql