报错：
[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
