redhat6.5安装mysql5.7

参考来源：

http://blog.csdn.net/liyf155/article/details/61419623

1.下载：

wget http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.12-1.el6.x86_64.rpm-bundle.tar

2.安装：

[root@localhost Desktop]# rpm -qa|grep mysql　　# 查看是否已安装
mysql-libs-5.1.61-4.el6.x86_64
[root@localhost Desktop]# rpm -e --nodeps mysql-libs-5.1.61-4.el6.x86_64　　#卸载

解压：tar -xf mysql-5.7.12-1.el6.x86_64.rpm-bundle.tar

顺序依次安装：

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

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

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

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

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

安装最后一个包的时候报错：

error: Failed dependencies:
 libnuma.so.1()(64bit) is needed by mysql-community-server-5.7.12-1.el6.x86_64

缺少依赖包：

numactl

下载：wget http://mirror.centos.org/centos/6/os/x86_64/Packages/numactl-2.0.9-2.el6.x86_64.rpm

安装：rpm -ivh numactl-2.0.9-2.el6.x86_64.rpm

安装成功

继续上次安装完成

启动mysql服务：service mysqld start

[root@localhost mysql5.7]# service mysqld start
Initializing MySQL database:                               [  OK  ]
Installing validate password plugin:                       [  OK  ]
Starting mysqld:                                           [  OK  ]
[root@localhost mysql5.7]# 

登陆:mysql -u root -p，初次登录密码为空，直接回车

[root@localhost mysql5.7]# mysql -u root -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

为什么会出现这个错误，原因是因为MySQL5.7中的mysql.user 表中没有Password字段，所以要以安全方式登录，然后修改密码。
解决方法如下：
修改MySQL配置文件：vim /etc/my.cnf，在文件末尾加上：skip-grant-tables，保存后重启MySQL服务：service mysqld restart，然后重新登录。

[root@localhost mysql5.7]# service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]
[root@localhost mysql5.7]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
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.

mysql> 

修改密码：

use mysql；

update user set password_expired='N' where user='root’; 

update user set authentication_string=password('123456') where user=’root‘;

flush privileges;

修改MySQL配置文件：vim /etc/my.cnf，去掉文件末尾：skip-grant-tables

重启MySQL服务：service mysqld restart

其他：

1. 编码设置：vim /etc/my.cnf，文件末尾加上编码内容default-character-set=utf8
2. 允许远程访问MySQL：
   赋予任何主机访问数据的权限：grant all on *.* to "root"@"%" identified by "123456";
3. 修改密码策略（可以使用简单密码）：

　　set global validate_password_policy=0;

　　set global validate_password_mixed_case_count=0;  

　　set global validate_password_number_count=3;

　　set global validate_password_special_char_count=0;

　　 set global validate_password_length=3;

　　SHOW VARIABLES LIKE 'validate_password%';