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sudo nano /etc/yum.repos.d/CentOS-Base.repo

[base]
name=CentOS-7 - Base
baseurl=http://vault.centos.org/centos/7/os/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-7 - Updates
baseurl=http://vault.centos.org/centos/7/updates/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-7 - Extras
baseurl=http://vault.centos.org/centos/7/extras/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

sudo yum clean all
sudo yum makecache
sudo yum update -y