1.下载mysql安装包

wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.44-1.el7.x86_64.rpm-bundle.tar

2.解压安装包

tar -xvf mysql-5.7.44-1.el7.x86_64.rpm-bundle.tar

3. 解决冲突

rpm -qa|grep mariadb

rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64

4. vi /etc/sysconfig/selinux

SELINUX=enforcing 修改为SELINUX=disabled

5.setenforce 0

6.iptables -I INPUT -p tcp --dport 3306 -j ACCEPT

7.安装mysql

rpm -ivh mysql-community-common-5.7.44-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-5.7.44-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.44-1.el7.x86_64.rpm

rpm -ivh mysql-community-server-5.7.44-1.el7.x86_64.rpm --force --nodeps

8.修改 /etc/my.cnf 文件

lower_case_table_names=1  #数据库不区分大小写

datadir=/data/mysql/database #指定数据库目录

9.启动mysql

systemctl start mysqld.service

10.获取用户密码

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

11.连接mysql后修改用户密码
alter user 'root'@'localhost' identified by 'Rjtx@1234';

12.修改用户host

use mysql;

update user set Host ='%' where User ='root';

flush privileges;