Need to set up yum repository for locally-mounted DVD on Red Hat Enterprise Linux 7 -

Environment

Red Hat Enterprise Linux 7

Issue

How to set up yum repository to use locally-mounted DVD with Red Hat Enterprise Linux (RHEL) 7
Would like to upgrade server from RHEL 7.x to RHEL 7.y
Have a secure environment that will never be connected to the internet, but still needs to be updated
Way to update the packages on server, with no satellite server and servers disconnected from internet
Offline patches for Red Hat systems
How do I create a local repository in RHEL 7?

Resolution

Please note: If the system is registered to Red Hat Network, yum can be run with the --noplugins option to prevent it from connecting to RHN. The safer option would be to unregister the system to avoid updating to the latest release.

Mount the RHEL 7 installation ISO to a directory like /mnt, e.g.:
Raw
```
# mount -o loop RHEL7.1.iso /mnt
```
If you use DVD media , you can mount like below.
Raw
```
# mount /dev/sr0  /mnt
```
Copy the media.repo file from the root of the mounted directory to /etc/yum.repos.d/ and set the permissions to something sane, e.g.:
Raw
```
# cp /mnt/media.repo /etc/yum.repos.d/rhel7dvd.repo
# chmod 644 /etc/yum.repos.d/rhel7dvd.repo
```

Edit the new repo file, changing the gpgcheck=0 setting to 1 and adding the following 3 lines

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

In the end, the new repo file could look like the following (though the mediaid will be different depending on the version of RHEL):

[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

clear the related caches by yum clean all and subscription-manager clean once
Raw
```
# yum clean all
# subscription-manager clean
```
check whether you can get the packages list from the DVD repo
Raw
```
# yum  --noplugins list
```
if no problem , you will update
Raw
```
# yum  --noplugins update
```