Use local CD-ROM production yum source

(1) mount the CD

# mount /dev/cdrom /mnt

All repo files (2) delete the directory /etc/yum.repos.d

# Cp -r /etc/yum.repos.d /etc/yum.repos.d_bak

# rm -rf /etc/yum.repos.d/*

(3) create a new file dvd.repo

# vim /etc/repos.d/dvd.repo

[dvd]

name=install dvd

baseurl = file: /// mnt

enabled=1

gpgcheck=0

(4) generating the cache refresh repos

# yum makecache

(5) using the command yum install the required test package

# yum install -y tftp