How to install Yum server in redhat 7/centos7

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.

1. Mount the RHEL 7 installation ISO to a directory like /mnt, e.g.

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

If you use DVD media , you can mount like below.

# mount /dev/sr0  /mnt 

2.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.:

# cp /mnt/media.repo /etc/yum.repos.d/rhel7dvd.repo

# chmod 644 /etc/yum.repos.d/rhel7dvd.repo  

3.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  

4.clear the related caches by yum clean all and subscription-manager clean once

# yum clean all
# subscription-manager clean 

5. check whether you can get the packages list from the DVD repo 

# yum  --noplugins list 

6.if no problem , you will update

# yum  --noplugins update

Hey This is the simple way to do that. Let's try, facing any problem comment below. I will get back to you soon.