centos 升级内核

如：

yum -y update
yum -y install yum-plugin-fastestmirror
cat /etc/redhat-release
cat /etc/os-release
uname -snr
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 repolist
yum --enablerepo=elrepo-kernel install kernel-ml
yum repolist all

sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
sudo grub2-set-default 0
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
sudo reboot
uname -snr

yum install yum-utils
package-cleanup --oldkernels

参考：

https://www.howtoforge.com/tutorial/how-to-upgrade-kernel-in-centos-7-server/