在尝试使用Yum安装MySQL社区服务器时遇到了错误，提示Repository epel被多次列出并过滤了所有匹配项。解决方案是先执行'yum module disable mysql'，然后执行'yum -y install mysql-community-server'来成功安装。
[root@MyDevelopECS ~]# yum install -y mysql-community-server
Repository epel is listed more than once in the configuration
Last metadata expiration check: 0:05:17 ago on Tue 24 Aug 2021 11:17:14 AM CST.
All matches were filtered out by modular filtering for argument: mysql-community-server
Error: Unable to find a match: mysql-community-server
解决方法：
先执行：yum module disable mysql
再执行：yum -y install mysql-community-server
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