一、安装

mysql官网找到你要安装的mysql版本
我安装的是mysql8

 wget https://repo.mysql.com/mysql80-community-release-el7-7.noarch.rpm

服务器上执行命令会下载文件到当前文件夹
然后执行命令

rpm -ivh mysql80-community-release-el7-7.noarch.rpm

然后就可以安装mysql-server

yum install mysql-server

开机启动mysql

systemctl enable mysqld.service
systemctl start mysqld.service

刚刚安装mysql是不知道初始密码的，所以需要获取初始密码

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

然后会给你一个密码

[Server] A temporary password is generated for root@localhost: t:-k9rLh(xXX

这样使用这个密码就可以登录mysql，然后修改我们自己的密码了

mysql -u root -p

登录进去后，进行操作，会提示我们修改密码

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement

修改密码

alter user user() identified by '你的密码';

二、连接mysql

安装完mysql之后，可能远程无法链接到你的服务器数据库
进入mysql

show databases;
use mysql;
update user set host='%' where user = 'root';
flush privileges;
select host, user from user;
+-----------+------------------+
| host      | user             |
+-----------+------------------+
| %         | root             |
| localhost | mysql.infoschema |
| localhost | mysql.session    |
| localhost | mysql.sys        |
+-----------+------------------+

这样就可链接服务器数据库了