干货，分享一次完整的CentOS升级内核脚本。

yum install wget vim screen net-tools lrzsz -y
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum groupinstall "Development Tools" -y
yum update -y

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

yum --disablerepo=\* --enablerepo=elrepo-kernel repolist

yum --disablerepo=\* --enablerepo=elrepo-kernel list kernel*

yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml.x86_64

awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg
CentOS Linux (4.17.1-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-862.3.3.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-862.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-14cd5fb0ee114fa88d6c747daee61c31) 7 (Core)

grub2-set-default 0

reboot
uname -a

rpm -qa|grep kernel|grep 3.10
rpm -qa|grep kernel|grep 3.10|xargs yum remove -y

yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml-tools.x86_64

rpm -qa | grep kernel