CentOS8和前面的不太一样，准备推出dnf（下一代yum）了，所以epel结构也和之前的CentOS7 不一样。
这里经过测试给出了CentOS8 下面可用的epel几个文件，分别/etc/yum.repos.d/目录下的：
epel.repo
epel-playground.repo
epel-testing.repo
epel-testing-modular.rep
epel-modular.rep
下面以epel.repo为例，其他都是一样的，把metalink注释掉，baseurl换成阿里云的，vi /etc/yum.repos.d/epel.repo
[epel]
name=Extra Packages for Enterprise Linux $releasever - $basearch
baseurl=https://mirrors.aliyun.com/epel/$releasever/Everything/$basearch
#metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-$releasever&arch=$basearch&infra=$infra&content=$contentdir
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-8
[epel-debuginfo]
name=Extra Packages for Enterprise Linux $releasever - $basearch - Debug
baseurl=https://mirrors.aliyun.com/epel/$releasever/Everything/$basearch/debug
#metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-$releasever&arch=$basearch&infra=$infra&content=$contentdir
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-8
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux $releasever - $basearch - Source
baseurl=https://mirrors.aliyun.com/epel/$releasever/Everything/SRPMS
#metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-source-$releasever&arch=$basearch&infra=$infra&content=$contentdir
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-8
gpgcheck=1
修改把这些网址修改之后，再运行： dnf repolist epel -v
[root@localhost yum.repos.d]# dnf repolist epel -v
Loaded plugins: builddep, changelog, config-manager, copr, debug, debuginfo-install, download, generate_completion_cache, needs-restarting, playground, repoclosure, repodiff, repograph, repomanage, reposync
DNF version: 4.2.17
cachedir: /var/cache/dnf
User-Agent: constructed: 'libdnf (CentOS Linux 8; generic; Linux.x86_64)'
repo: using cache for: AppStream
AppStream: using metadata from Thu 16 Jul 2020 09:44:25 PM EDT.
repo: using cache for: aliyun-BaseOS
aliyun-BaseOS: using metadata from Thu 16 Jul 2020 09:44:21 PM EDT.
repo: using cache for: extras
extras: using metadata from Fri 10 Jul 2020 10:19:28 AM EDT.
repo: using cache for: epel-modular
epel-modular: using metadata from Thu 09 Jul 2020 09:04:51 PM EDT.
repo: downloading from remote: epel
Extra Packages for Enterprise Linux 8 - x86_64 4.8 MB/s | 7.4 MB 00:01
epel: using metadata from Wed 22 Jul 2020 08:46:16 PM EDT.
Last metadata expiration check: 0:00:01 ago on Fri 24 Jul 2020 12:15:48 PM EDT.
Completion plugin: Generating completion cache...
Repo-id : epel
Repo-name : Extra Packages for Enterprise Linux 8 - x86_64
Repo-status : enabled
Repo-revision : 1595465144
Repo-updated : Wed 22 Jul 2020 08:46:16 PM EDT
Repo-pkgs : 6,105
Repo-available-pkgs: 6,104
Repo-size : 7.8 G
Repo-baseurl : https://mirrors.aliyun.com/epel/8/Everything/x86_64
Repo-expire : 172,800 second(s) (last: Fri 24 Jul 2020 12:15:48 PM EDT)
Repo-filename : /etc/yum.repos.d/epel.repo
Total packages: 6,105
https://blog.csdn.net/weixin_42205230/article/details/104744588