root kullanıcısı ile 

#cd /etc/yum.repos.d/

#sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

#sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

#yum install mc net-tools.x86_64 unzip wget epel-release -y

#yum update -y