1.下载MySQL源
wget http://dev.MySQL.com/get/mysql57-community-release-el7-7.noarch.rpm
2.安装MySQL源
rpm -ivh mysql57-community-release-el7-7.noarch.rpm
3.安装mysql-community-server
yum install mysql-community-server -y
4.重启mysql
systemctl restart mysqld
注：自动启动服务用 systemctl enable mysql
5.查看临时密码
grep 'A temporary password' /var/log/mysqld.log
2015-12-24T08:04:50.296020Z 1 [Note] A temporary password is generated for root@localhost: I(eKs9PyklP_
6.用临时密码登录mysql并修改root密码，新增用户，打开远程访问
>mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 15
Server version: 5.7.10 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, 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.
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;
mysql> alter user 'root'@'localhost' identified by 'root'; // 备注：这里换成自己的密码
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> create user hadoop identified by 'root';
Query OK, 0 rows affected (0.00 sec)
mysql>grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option; //备注：这里是为了可以远程访问数据库
Query OK, 0 rows affected, 1 warning (0.00 sec)
附（在应用的时候会遇到的错误信息，及解决办法）：
1.用group by的时候报错，需要改配置文件
/etc/my.cnf
在最后加入
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
然后重启mysql
systemctl restart mysqld
2.导入失败，报错
MySQL Got a packet bigger than 'max_allowed_packet' bytes错误
修改方法
2.1、修改配置文件
可以编辑my.cnf来修改（windows下my.ini）,在[mysqld]段或者mysql的server配置段进行修改。
max_allowed_packet = 20M
如果找不到my.cnf可以通过
mysql --help | grep my.cnf
去寻找my.cnf文件。
linux下该文件在/etc/下。
2.2、在mysql命令行中修改
在mysql 命令行中运行
set global max_allowed_packet = 2*1024*1024*10
然后退出命令行，重启mysql服务，再进入。
show VARIABLES like '%max_allowed_packet%';