Yum local repository to be able to access a CDROM/DVD iso.

You do not have access to the network and you would like to install some packages from CDROM/DVD, please follow the instructions:

First take a backup of /etc/yum.repos.d/ then remove these repo files:
CentOS-Base.repo, CentOS-Debuginfo.repo and CentOS-Media.repo
and add a new file called CentOS_local.repo with the following lines:

[root@localhost yum.repos.d]# cat CentosOS_local.repo
name=Centos DVD
baseurl=file:///media #mount location
[root@localhost yum.repos.d]#

Here baseurl=file:///media is the location of CentOS iso. Now you have to mount your CentOS iso into the media folder:

[root@localhost]# mount /dev/cdrom /media

Once this is done, you can go ahead with yum to install packages from CD/DVD.

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