1、检测下系统有没有自带的mysql：yum list installed | grep mysql，
如果已经有的话执行命令yum -y remove mysql-libs.x86_64卸载已经安装的mysql。
http://dev.mysql.com/downloads/mysql/
2、先到mysql官网下载5.7.11的安装包，download-yum选择Red Hat Enterprise Linux 7 / Oracle Linux 7 (ArchitectureIndependent), RPM Package ，
进入系统下载安装包：
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#wget http://repo.mysql.com//mysql57-community-release-el7-7.noarch.rpm
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如果新的系统还没有wget命令的话可以先：
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#yum install wget
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3、添加选择yum源：
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#yum localinstall mysql57-community-release-el7-7.noarch.rpm
Running transaction
正在安装 : mysql57-community-release-el7-7.noarch 1
/1
验证中 : mysql57-community-release-el7-7.noarch 1
/1
已安装:
mysql57-community-release.noarch 0:el7-7
完毕！
#yum repolist all | grep mysql
mysql-connectors-community
/x86_64
MySQL Connectors Community 启用: 21
mysql-connectors-community-
source
MySQL Connectors Community - Sourc 禁用
mysql-tools-community
/x86_64
MySQL Tools Community 启用: 36
mysql-tools-community-
source
MySQL Tools Community - Source 禁用
mysql55-community
/x86_64
MySQL 5.5 Community Server 禁用
mysql55-community-
source
MySQL 5.5 Community Server - Sourc 禁用
mysql56-community
/x86_64
MySQL 5.6 Community Server 禁用
mysql56-community-
source
MySQL 5.6 Community Server - Sourc 禁用
mysql57-community
/x86_64
MySQL 5.7 Community Server 启用: 110
mysql57-community-
source
MySQL 5.7 Community Server - Sourc 禁用
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4、安装mysql：
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#yum install mysql-community-server
已安装:
mysql-community-libs.x86_64 0:5.7.14-1.el7 mysql-community-libs-compat.x86_64 0:5.7.14-1.el7 mysql-community-server.x86_64 0:5.7.14-1.el7
作为依赖被安装:
mysql-community-client.x86_64 0:5.7.14-1.el7 mysql-community-common.x86_64 0:5.7.14-1.el7
替代:
mariadb-libs.x86_64 1:5.5.44-2.el7.centos
完毕！
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5、安装完成之后会自动在log中生成连接的密码，
启动mysql：
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#systemctl start mysqld
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查看密码：
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[root@mysqlA ~]
# cat /var/log/mysqld.log |grep password
2016-08-23T02:33:48.872073Z 1 [Note] A temporary password isgenerated
for
root@localhost: %IrczkB+J7Ez
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你必须重新设置密码才能执行语句
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[root@mysqlA ~]
# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 4
Server version: 5.7.14
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> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
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6、其实想要重置 5.7 的密码很简单，就一层窗户纸：
1) 修改/etc/my.cnf，在 [mysqld] 小节下添加一行：skip-grant-tables=1
这一行配置让 mysqld 启动时不对密码进行验证
2) 重启mysqld 服务：systemctl restart mysqld
3) 使用 root 用户登录到 mysql：mysql -uroot
4) 切换到mysql数据库，更新 user 表：
update user set authentication_string = password('123456'),password_expired = 'N', password_last_changed = now() where user = 'root';
在之前的版本中，密码字段的字段名是 password，5.7版本改为了 authentication_string
5) 退出 mysql，编辑 /etc/my.cnf 文件，删除 skip-grant-tables=1的内容
7、重启mysqld 服务，再用新密码登录即可
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[root@mysqlA ~]
# mysql -V
mysql Ver 14.14 Distrib5.7.14,
for
Linux (x86_64) using EditLine wrapper
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8、允许远程连接
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mysql>
select
user,host from mysql.user;
+-----------+-----------+
| user | host |
+-----------+-----------+
| mysql.sys | localhost |
| root | localhost |
+-----------+-----------+
2 rows
in
set
(0.00 sec)
mysql>grant all privileges on *.* to
'root'
@
'%'
identified by
'r0b0t.RQB'
with grant option;
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9、修改密码多种方法
方法1： 用SET PASSWORD命令
mysql -u root
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');
方法2：用mysqladmin
mysqladmin -u root password "newpass"
如果root已经设置过密码，采用如下方法
mysqladmin -u root password oldpass "newpass"
方法3： 用UPDATE直接编辑user表
mysql -u root
mysql> use mysql;
mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
mysql> FLUSH PRIVILEGES;
在丢失root密码的时候，可以这样
mysqld_safe --skip-grant-tables&
mysql -u root mysql
mysql> UPDATE user SET password=PASSWORD("new password") WHERE user='root';
mysql> FLUSH PRIVILEGES;