一、查看以后环境是否装置MySQL，如有装置MySQL或者Mariadb，能够卸载；

rpm -qa | grep mysqlpm -qa |grep mariadbyum remove mariadb-libs-5.5.64-1.el7.x86_64

二、下载并装置
1、国内用户思考切换yum源为阿里云；

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repoyum makecacheyum update -y

2、下载对应版本的MySQL RPM安装包，下载地址http://mirrors.ustc.edu.cn/mysql-ftp/Downloads

# server包wget https://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-server-5.7.31-1.el7.x86_64.rpm# client包wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-client-5.7.31-1.el7.x86_64.rpm# common包wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-common-5.7.31-1.el7.x86_64.rpm# lib包wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-libs-5.7.31-1.el7.x86_64.rpm

3、装置依赖包

yum install -y perl libaio net-tools

4、装置对应版本的MySQL（按程序）

rpm -ivh mysql-community-common-5.7.31-1.el7.x86_64.rpm --force --nodepsrpm -ivh mysql-community-libs-5.7.31-1.el7.x86_64.rpm --force --nodepsrpm -ivh mysql-community-client-5.7.31-1.el7.x86_64.rpmrpm -ivh mysql-community-server-5.7.31-1.el7.x86_64.rpm

5、启动MySQL

systemctl start mysqld.servicesystemctl status mysqld.service

6、登陆MySQL更新默认明码，

# 获取默认root明码cat /var/log/mysqld.log | grep 'password'# 登陆mysql，更改默认明码mysql -u root -pset password=password('xxxxxx')# 开启近程连贯use mysql;update user set Host = '%' where Host = 'localhost' and User='root';flush privileges;