去官网找到自己要安装的mysql版本，网址：https://dev.mysql.com/downloads/mysql/

找到对应版本，复制下载链接

然后用wget进行安装：

mkdir mysql
cd mysql
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.22-1.el8.x86_64.rpm-bundle.tar

下载完成后，使用tar命令进行解压，解压出来是散的，所以需要提前新建一个文件夹

tar -xvf mysql-8.0.22-1.el8.x86_64.rpm-bundle.tar

安装步骤，以下需要按顺序进行安装

# 安装依赖
yum install libaio net-tools perl
yum install perl-JSON.noarch -y

# 按顺序安装mysql的各个组件（需要按顺序安装，否则会安装失败）
rpm -ivh mysql-community-common-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-debugsource-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-libs-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-server-debug-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-server-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-client-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-client-plugins-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-client-plugins-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-test-debuginfo-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-client-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-server-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-server-debug-8.0.22-1.el8.x86_64.rpm
rpm -ivh mysql-community-test-8.0.22-1.el8.x86_64.rpm

如果出现错误可以根据日志内容来判断，如：

https://blog.csdn.net/aiyowei1106/article/details/88703746

如果没有启动使用cat来查看日志

cat /var/log/mysqld/log

查看服务是否启动

service mysqld status

正常启动的情况显示这样

查看mysql初始密码：

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

初始密码是最后面那个YZxd-*)q720J

进入mysql

mysql -u root -p
YZxd-*)q720J

修改密码

set password for 'root'@'localhost' = password('root123');

现在就可以正常使用了...