問題描述：系統更新時提示
The GPG keys listed for the "MySQL 5.7 Community Server" repository are already installed but they a ...
解決辦法：
rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
運行這個后，再次執行更新就ok了
參考鏈接：https://blog.csdn.net/b_ingram/article/details/122761408