检查删除原有的mysql(可以不做，自己记录)

1、 下载

MySQL :: Download MySQL Community Server (Archived Versions)

wget https://cdn.mysql.com/archives/mysql-8.0/mysql-server_8.0.32-1ubuntu20.04_amd64.deb-bundle.tar

2、解压到指定目录下 

tar xvf mysql-server_8.0.32-1ubuntu20.04_amd64.deb-bundle.tar -C /opt/mysql-8.0.32/

3、安装依赖

sudo apt install -y libaio1 libmecab2 man-db libc-bin

4、安装mysql

dpkg -i mysql-community-client-plugins_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-community-client-core_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-common_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-community-client_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-client_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-community-server-core_8.0.32-1ubuntu20.04_amd64.deb
dpkg -i mysql-community-server_8.0.32-1ubuntu20.04_amd64.deb

确认完密码后，有个选项，我选的第一个，第二个好像是mysql5啥的。完了后就可以登录了。

5、远程连接

使用远程连接工具报错

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '你的密码';systemctl restart mysql # 重启mysql

远程连接正常

6、开机自启动

参考博客：Ubuntu/Linux安装JDK、Mysql、Redis、Rabbitmq、Nginx 并设置开机自启动_ubuntu service mysql start 自动启动-CSDN博客

在centos中开机自启动命令 systemctl enable mysqld
在buntu中是 systemctl enable mysqlsystemctl restart mysql # 重启
systemctl status mysql  # 查看状态