mount -t iso9660 -o loop /mnt/rhel_x86_64_7_5.iso /media/cdrom
vim /etc/yum.repos.d/rhel-media.repo
[rhel-media]
name=Red Hat Enterprise Linux 7.5
baseurl=file:///media/cdrom
enabled=1
gpgcheck=0
yum update
mount -t iso9660 -o loop /mnt/rhel_x86_64_7_5.iso /media/cdrom
vim /etc/yum.repos.d/rhel-media.repo
[rhel-media]
name=Red Hat Enterprise Linux 7.5
baseurl=file:///media/cdrom
enabled=1
gpgcheck=0
yum update