Point Centos repository to download packages.
In here you can just add these to your /etc/yum.repos.d/centos.repo file and paste these contents.
[base]
name=CentOS $releasever – Base
baseurl=http://mirror.centos.org/centos/7/os/$basearch/
gpgcheck=0
enabled=1
[updates]
name=CentOS $releasever – Updates
baseurl=http://mirror.centos.org/centos/7/updates/$basearch/
gpgcheck=0
enabled=1
[extras]
name=CentOS $releasever – Extras
baseurl=http://mirror.centos.org/centos/7/extras/$basearch/
gpgcheck=0
enabled=1
name=CentOS $releasever – Base
baseurl=http://mirror.centos.org/centos/7/os/$basearch/
gpgcheck=0
enabled=1
[updates]
name=CentOS $releasever – Updates
baseurl=http://mirror.centos.org/centos/7/updates/$basearch/
gpgcheck=0
enabled=1
[extras]
name=CentOS $releasever – Extras
baseurl=http://mirror.centos.org/centos/7/extras/$basearch/
gpgcheck=0
enabled=1
Install epel repo,
# yum clean all
# yum list installed
Thanks,
Sunil