一、环境准备
1.Mysql8.0下载地址：
2.选择DOWNLOADS---选择MySQL Community (GPL) Downloads---选择MySQL Community Server---选择如图---选择No thanks, just start my download.
3.下载和整理需要的文件放在安装文件夹中 
需要安装的文件：
二、安装软件
1.安装目录/tmp赋权，检查依赖软件是否安装
[root@localhost ~]# chmod -R 777 /tmp
[root@localhost ~]# rpm -qa |grep libaio
[root@localhost ~]# rpm -qa |grep net-tools
net-tools没有安装，需要安装
[root@localhost ~]# yum -y install net-tools
2.将安装包拷贝到/tmp目录下，运行rpm命令安装安装包
[root@localhost ~]# cd /tmp
[root@localhost tmp]# ls
3.安装顺序
首先 mysql-community-common-8.0.29-1.el7.x86_64.rpm
然后mysql-community-client-plugins-8.0.29-1.el7.x86_64.rpm
然后mysql-community-libs-8.0.29-1.el7.x86_64.rpm
然后mysql-community-client-8.0.29-1.el7.x86_64.rpm
最后mysql-community-server-8.0.29-1.el7.x86_64.rpm
①[root@localhost tmp]# rpm -ivh mysql-community-common-8.0.29-1.el7.x86_64.rpm
②[root@localhost tmp]# rpm -ivh mysql-community-client-plugins-8.0.29-1.el7.x86_64.rpm
③[root@localhost tmp]# rpm -ivh mysql-community-libs-8.0.29-1.el7.x86_64.rpm
提示报错：
[root@localhost tmp]# yum remove mysql-libs
[root@localhost tmp]# rpm -ivh mysql-community-libs-8.0.29-1.el7.x86_64.rpm
④[root@localhost tmp]# rpm -ivh mysql-community-client-8.0.29-1.el7.x86_64.rpm
⑤[root@localhost tmp]# rpm -ivh mysql-community-server-8.0.29-1.el7.x86_64.rpm
提示报错：需要安装yum源和rpm文件
[root@localhost tmp]# yum install -y perl-Module-Install.noarch
[root@localhost tmp]# rpm -ivh mysql-community-icu-data-files-8.0.29-1.el7.x86_64.rpm
[root@localhost tmp]# rpm -ivh mysql-community-server-8.0.29-1.el7.x86_64.rpm
安装完成
4.检查安装包是否安装完成
[root@localhost tmp]# rpm - qa | grep -i mysql
5.服务初始化
[root@localhost tmp]# mysqld --initialize --user=mysql
6.查看密码
[root@localhost tmp]# cat /var/log/mysqld.log
7.查看数据库服务状态
查看状态：[root@localhost tmp]# systemctl status mysqld.service
8.启动服务
启动：[root@localhost tmp]# systemctl start mysqld.service
查看状态：[root@localhost tmp]# systemctl status mysqld.service
9.设置mysql自启动
查看状态：[root@localhost tmp]# systemctl list-unit-files | grep mysqld.service
（enabled：开机自启动，disable：开机不启动）
设置自启动：[root@localhost tmp]# systemctl enable mysqld.service
设置自启动关闭：[root@localhost tmp]# systemctl disable mysqld.service
10.登录
[root@localhost tmp]# mysql -uroot -p
Enter password: 此处密码是前面查看的密码
11.修改密码和重新登录
改密：mysql> alter user 'root'@'localhost' identified by 'abc123';
登出：mysql> quit
登录：[root@localhost tmp]# mysql -uroot -p
输入密码：Enter password: abc123
12.此处修改host为%对应root，为了使用软件可以连接上数据库
mysql> show databases
-> ;
mysql> use mysql
mysql> select user,host from user;
mysql> update user set host = '%' where user = 'root';
mysql> flush privileges
-> ;
mysql> select user,host from use
13.关闭防火墙
查看状态：[root@localhost tmp]# systemctl status firewalld
关闭：[root@localhost tmp]# systemctl stop firewalld
关闭开机自启动：[root@localhost tmp]# systemctl disable firewalld
12.使用Navicat Permium 15连接mysql，设置
