CentOS 7安装MySQL 8.0.15

一.下载

#下载mysql安装包以及依赖的文件

wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-server-8.0.15-1.el7.x86_64.rpm
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-client-8.0.15-1.el7.x86_64.rpm
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-devel-8.0.15-1.el7.x86_64.rpm
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-common-8.0.15-1.el7.x86_64.rpm
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-libs-compat-8.0.15-1.el7.x86_64.rpm
wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-community-libs-8.0.15-1.el7.x86_64.rpm

二.安装

首先

#卸载Centos7自带的mariadb，不然安装mysql的时候会有冲突

yum remove mariadb-libs -y

其次，安装

#注意：安装顺序必须按照以下顺序，因为这些包之间也有依赖关系

rpm -ivh mysql-community-common-8.0.15-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.15-1.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.15-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-compat-8.0.15-1.el7.x86_64.rpm 
rpm -ivh mysql-community-client-8.0.15-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.15-1.el7.x86_64.rpm

三.重启MySQL

#启动mysql

systemctl start mysqld

#找到随机密码

grep "temporary password" /var/log/mysqld.log

#登陆mysql

mysql –u root –p  

输入获得的随机密码

四.修改密码

#在MySQL中‘；’代表语句输入结束

（1）查看MySQL密码策略

show variables like '%validate%';

（2）设置简单密码

注：global配置全局 相当于更改配置文件my.cnf

set global validate_password.policy=0；密码安全等级 0代表最弱
set global validate_password.mixed_case_count=0;大小写字母的最少个数
set global validate_password.number_count=0; 密码中数字的最少个数
set global validate_password.special_char_count=0; 特殊字符的最少个数
flush privileges; 

（3）修改密码

LTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密码';

五.重启MySQL

重启MySQL服务

systemctl restart mysqld;

#登陆mysql

mysql –u root –p  

输入你修改后的密码 ，检验是否操作成功。