Enable EPEL and Local Repository on RHEL8

一、配置RHEL8 使用 EPEL Repository
1. Installing the configuration package
$ sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

2. To see where those files have been installed, we can run the following command:
$ sudo rpm -ql epel-release

3. To verify that the EPEL repository has been enabled we can run:
$ sudo dnf repolist -v

4. List the packages contained in the EPEL8 repository.
$ sudo dnf repository-packages epel list

5. Disable subscription-manager plugin.

[root@rusking ~]# cat /etc/yum/pluginconf.d/subscription-manager.conf
[main]
enabled=0

# When following option is set to 1, then all repositories defined outside redhat.repo will be disabled
# every time subscription-manager plugin is triggered by dnf or yum
disable_system_repos=0

二、配置RHEL8使用Local Repository
How to Setup Local Yum/DNF Repository on RHEL 8 Server Using DVD or ISO File.
1. Mount RHEL 8 ISO file / Installation DVD
Copy RHEL 8 ISO file inside your system.
将ISO或安装盘中的内容拷贝到某一指定目录。本次测试，拷贝到/opt/RHEL82目录

[root@rusking ~]#  ls /opt/RHEL82/
 AppStream   EULA               images       RPM-GPG-KEY-redhat-beta      TRANS.TBL
 BaseOS      extra_files.json   isolinux     RPM-GPG-KEY-redhat-release
 EFI         GPL                media.repo  'System Volume Information'

2. 修改repo配置文件及权限
[root@rusking RHEL82]# cp media.repo /etc/yum.repos.d/rhel8.repo

#chmod 644 /etc/yum.repos.d/rhel8.repo

# cat /etc/yum.repos.d/rhel8.repo

# cat /etc/yum.repos.d/rhel8.repo
[InstallMedia-BaseOS]
name=Red Hat Enterprise Linux 8.2.0-BaseOS
metadata_expire=-1
gpgcheck=1
enabled=1
baseurl=file:///opt/RHEL82/BaseOS/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[InstallMedia-AppStream]
name=Red Hat Enterprise Linux 8 - AppStream
metadata_expire=-1
gpgcheck=1
enabled=1
baseurl=file:///opt/RHEL82/AppStream/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

3. 测试
# dnf clean all
# dnf repolist

[root@rusking ~]# dnf repolist
repo id                               repo name
InstallMedia-AppStream                Red Hat Enterprise Linux 8 - AppStream
InstallMedia-BaseOS                   Red Hat Enterprise Linux 8.2.0-BaseOS
epel                                  Extra Packages for Enterprise Linux 8 - x86_64
epel-modular                          Extra Packages for Enterprise Linux Modular 8 - x86_64
[root@rusking ~]#

# dnf install nginx