安装mysql 

1）rpm安装mysql5.7

mysql-community-devel-5.7.12-1.el6.x86_64.rpm

mysql-community-libs-5.7.12-1.el6.x86_64.rpm

mysql-community-test-5.7.12-1.el6.x86_64.rpm

mysql-community-client-5.7.12-1.el6.x86_64.rpm

mysql-community-common-5.7.12-1.el6.x86_64.rpm

mysql-community-server-5.7.12-1.el6.x86_64.rpm

如果有冲突的安装，先卸载，如：

rpm -e mysql-libs-5.1.66-2.el6_3.x86_64 --nodeps

2）启动mysql

service mysqld start

3）修改mysql 的root用户密码

如果在/etc/my.cnf修改了socket文件位置，则也应该同时修改[mysql]的socket文件位置；

#mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

#mysql -u root mysql

//mysql5.6

// mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';

//mysql5.7

mysql> UPDATE user SET authentication_string=PASSWORD('aaa123') where USER='root';

//使用desc user查看表字段描述

mysql> FLUSH PRIVILEGES;

mysql> quit

重新执行：

Mysql>SET PASSWORD = PASSWORD('123456');

或者

Mysql>alter user root@localhost identified by ‘aaAA1234!@#$’;

*rpm安装，basedir为/usr

4）root用户登录mysql

[root@vm1 ~]# mysql -uroot -p

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

Your MySQL connection id is 5

Server version: 5.7.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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