我想安装 MQTT 但无法在 CentOS 8 上安装 - 阿里云，因为我发现以下错误
sudo yum -y install mosquitto
Repository epel is listed more than once in the configuration
Last metadata expiration check: 0:02:11 ago on Fri 03 Apr 2020 09:51:50 PM CST.
No match for argument: mosquitto
Error: Unable to find a match: mosquitto
这是我的 EPEL 清单
cat epel.*
[epel]
name=Extra Packages for Enterprise Linux $releasever - $basearch
#baseurl=https://download.fedoraproject.org/pub/epel/$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 - $basearch - Debug
#baseurl=https://download.fedoraproject.org/pub/epel/$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 - $basearch - Source
#baseurl=https://download.fedoraproject.org/pub/epel/$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