# mkdir /cdrom # mount /dev/cdrom /cdrom
Create the new repo file called cdrom.repo under /etc/repos.d directory.
# vi /etc/yum.repos.d/local.repo
Add the following details.
[LocalRepo] name=Local Repository baseurl=file:///cdrom enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7