Get CentOS 7 Reading Installation Repository from your DVD with No Internet Connection

Step1: vim /etc/yum.repos.d/CentOS-Base.repo

Step2: Go to the end of the file

Type in the following
[LocalRepository]
name=LocalRepository
baseurl=file:///media/cdrom
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Make sure the cd/dvd media is mounted on /media/cdrom
This tells yum to check /media/cdrom for the repository.

Note: If your cd/dvd media was auto-mounted. It’s likely at somewhere like:

/run/media/pier/”CentOS 7 x86_64″

Thus you should modify the line baseurl accordingly.

baseurl=file:///run/media/pier/"CentOS 7 x86_64"

Step 3: For the other repositories in the file, add
enabled=0
to disable all the other repositories. This is important particularly if you do not have internet connection. Else when yum tries to access the web-based repositories,  yum update will fail.

Step 4: yum update

You should be able to install stuff from the repository now. ie. yum -y install vim

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