Repositorio Local desde una imagen .iso

# mount -o loop RHEL7.1.iso /mnt
# mount -o loop RHEL7.1.iso /mnt
# mount -o loop /dev/sr0  /mnt

cp /mnt/media.repo /etc/yum.repos.d/rhel7dvd.repo
chmod 644 /etc/yum.repos.d/rhel7dvd.repo

enabled=1
baseurl=file:///mnt/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[InstallMedia]
name=DVD for Red Hat Enterprise Linux 7.1 Server
mediaid=1359576196.686790
metadata_expire=-1
gpgcheck=1
cost=500
enabled=1
baseurl=file:///mnt/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

yum clean all
subscription-manager clean
yum  --noplugins install gcc-* libstdc++* glibc-devel