1, open settings, select the connection
2, create a directory and mount the CD
mkdir /ww
mount /dev/cdrom /ww
3, modify the yum configuration file
'Cd /etc/yum.repos.d' file into yum.repos.d
4, vi modify /CentOS-Media.repo into the press i modify mount path / WW , then gpgcheck = 1 to 0 , 0 to 1 = Enabled.
Press ESC revised exit and enter wq
5. Enter yum list
6, then you can install yum source file
yum install package names -y