一键升级内核KVM架构的CentOS 7

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org && rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm && yum --enablerepo=elrepo-kernel install kernel-ml && sed -i 's/GRUB_DEFAULT=saved/GRUB_DEFAULT=0/g' /etc/default/grub && grub2-mkconfig -o /boot/grub2/grub.cfg && reboot