错误：
Repository epel is listed more than once in the configuration
bintray-rabbitmq-rpm 5.6 B/s | 10 B 00:01
Errors during downloading metadata for repository ‘bintray-rabbitmq-server‘:
- Status code: 403 for https://dl.bintray.com/rabbitmq/rpm/rabbitmq-server/v3.8.x/el/8/repodata/repomd.xml (IP: 34.215.63.224)
Error: Failed to download metadata for repo ‘bintray-rabbitmq-server‘: Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
解决方案
cd /etc/yum.repos.d/
删除
rm -rf rabbitmq_erlang.repo
rm -rf rabbitmq.repo
删除无用的repo或者报错的repo
阿里云 centos8 yum check_update 报错
原文：https://www.cnblogs.com/zdalongren/p/14821012.html