centos 安装mysql 5.7

https://cloud.tencent.com/developer/article/1886339

如果安装的时候出现

Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql


The GPG keys listed for the "MySQL 5.7 Community Server" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.


 Failing package is: mysql-community-libs-5.7.44-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

　　则执行一下以下命令行，命令行的2022年份不要改

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022