一、下载mysql 5.7 安装包

下载地址

(1)选择Looking for previous GA versions

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(2)选择 Red Hat Enterprise Linux / Orical Linux

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(3)进行下载

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二、 删除原有的mariadb，不然装不进msyql

(1)查询：rpm -qa | grep mariadb

(2)卸载mariadb：rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64

三、开始安装

(1)检查安装libaio环境：

rpm -qa|grep libaio

(2)没有则安装，上传后安装命令：

rpm -ivh libaio-0.3.107-10.el6.x86_64.rpm

(3)下载mysql5.7的tar压缩包

mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar

(4)将安装包上传到centos7系统，测试地址为：

/root/tools/mysql_tools

(5)解压：

tar -xvf mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar

(6)安装mysql-community-common-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-common-5.7.27-1.el7.x86_64.rpm --force --nodeps

(7)安装mysql-community-libs-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-5.7.27-1.el7.x86_64.rpm --force --nodeps

(8)安装mysql-community-devel-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-devel-5.7.27-1.el7.x86_64.rpm --force --nodeps

(9)安装mysql-community-libs-compat-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-compat-5.7.27-1.el7.x86_64.rpm --force --nodeps

(10)安装mysql-community-client-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.27-1.el7.x86_64.rpm --force --nodeps

(11)安装mysql-community-server-5.7.27-1.el7.x86_64.rpm

rpm -ivh mysql-community-server-5.7.27-1.el7.x86_64.rpm --force --nodeps

(12)关闭mysql服务：

service mysqld stop

(13)修改配置文件：

vim /etc/my.cnf

(14)设置免密码登录：在mysqld标签内添加skip-grant-tables

(15)修改/var/lib/mysql权限，不然会打开服务不成功：

chown mysql:mysql -R /var/lib/mysql

(16)打开服务：service mysqld start

(17)空密码登录：mysql -u root

(18)修改密码：依次执行

flush privileges; # 更新权限

set password for root@localhost = password('123456'); # 设置root密码为123456;

use mysql;

update user set host = '%' where user ='root'; # 配置可远程登录

flush privileges; # 更新权限

exit; # 退出

(19)测试登录：mysql -u root -p

输入密码：123456

(20)设置mysql开机自启：systemctl enable mysqld