在线环境安装MySQL8.0(yum安装)_yum install mysql8

1.下载安装包

wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

2.安装mysql的rpm包

yum -y install mysql80-community-release-el7-3.noarch.rpm

3.安装MySQL服务

yum install -y mysql-community-server --nogpgcheck

4.启动服务，设置自启动

systemctl start mysqld.service
systemctl enable mysqld.service

5.修改密码

grep "password" /var/log/mysqld.log    #查看初始密码

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

sudo mysql_secure_installation

会有多个步骤： （注意这里设置密码，默认密码复杂度是中，需要 大写字母，小写字母，数字）

Enter password for user root:
输入刚刚得到的密码
New password:
输入新的密码
Re-enter new password:
重复输入新的密码
Change the password for root ? ((Press y|Y for Yes, any other key for No)
是否想改变root的密码，输入Y，重复设置密码。
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No)
输入Y
Remove anonymous users? (Press y|Y for Yes, any other key for No)
删除匿名用户，输入Y
Disallow root login remotely? (Press y|Y for Yes, any other key for No)
是否禁止远程登录，输入N（这个是允许远程登陆，但是设置好像不起效果）
Remove test database and access to it? (Press y|Y for Yes, any other key for No)
是否删除test数据库，输入Y
Reload privilege tables now? (Press y|Y for Yes, any other key for No)
是否重新加载到权限表，输入Y

6.登陆MySQL

mysql -u root -p

输入刚刚设置的密码进入mysql

7.密码规则，远程登陆设置

SHOW VARIABLES LIKE 'validate_password%';       #查看有哪些可用变量

SET GLOBAL validate_password.policy= 0;       #密码复杂度设置为低    1为中  2为高

set global validate_password.length = 6;    #设置密码最短长度

ALTER USER 'root'@'localhost' IDENTIFIED BY '密码';    # 再次修改密码

create user root@"%" identified by "密码";      #新增允许远程root用户

grant all privileges on *.* to root@"%" with grant option;     #为新增的用户赋权  

8.测试远程登陆数据库

navicat连接测试