We must have a frsh installation of CentOS 7 with internet access. We begin by disabling selinux because problems were observed during the installation with selinux enabled.
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/sysconfig/selinux sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/selinux/config