1. 安装mysql5.6
    3. wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
    5. rpm -ivh mysql-community-release-el7-5.noarch.rpm
    7. yum install mysql-server -y
    9. service mysqld start
    11. service mysqld status
    13. systemctl enable mysqld.service
    15. grep "password" /var/log/mysqld.log找初始密码，如果报找不到文件那就试试grep "password" /var/log/mysql/mysqld.log
    17. mysqladmin -uroot -p password NewPassword回车输入初始密码来重置密码
    19. 安装mysql5.7
    21. wget http://repo.mysql.com/mysql57-community-release-el7-11.noarch.rpm
    23. rpm -ivh mysql57-community-release-el7-11.noarch.rpm
    25. yum install mysql-server -y
    27. service mysqld start
    29. service mysqld status
    31. systemctl enable mysqld.service
    33.  grep "password" /var/log/mysqld.log找初始密码，如果报找不到文件那就试试grep "password" /var/log/mysql/mysqld.log
    35.  mysqladmin -uroot -p password NewPassword回车输入初始密码来重置密码
    37. 安装mysql8.0
    39. wget http://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm
    41. rpm -ivh mysql80-community-release-el7-3.noarch.rpm
    43. yum install mysql-server -y
    45. service mysqld start
    47. service mysqld status
    49. systemctl enable mysqld.service
    51. grep "password" /var/log/mysql/mysqld.log找初始密码，如果报找不到文件那就试试grep "password" /var/log/mysqld.log
    53. mysqladmin -uroot -p password NewPassword回车输入初始密码来重置密码