centos 6.5 kernel upgrade

1.  rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
 2. rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm

3. yum --enablerepo=elrepo-kernel -y install kernel-lt 

(This is the long-term stability) or using yum --enablerepo = elrepo-kernel install kernel-ml -y

 vim /etc/grub.conf default=0

  reboot (restart)