Linux系统：centos7

• 安装mysql5.7

  yum install mysql-server -y
  

• centos7修改密码为admin

  systemctl status mysqld

  systemctl start mysqld

  show global variables like "%password%";

  set global validate_password_length=3;
  

  set global validate_password_policy=LOW;

  quit

  mysql -uroot -padmin