第一種方法升級到最新版本，安裝較快

1.匯入key
rpm?--importhttps://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2.安裝elrepo的yum源
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
3. 安裝核心
yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y
4.檢視設定預設啟動順序
awk-F\' '$1=="menuentry "{print $2}' /etc/grub2.cfg，顯示結果應該是升級後的最新版本的核心在上面，執行以下命令：
grub2-set-default 0
5.重啟
reboot
 

第二種方法編譯方式安裝，安裝時間較長

https://www.kernel.org/下載指定版本
https://www.kernel.org/pub/linux/kernel/v4.x/

[[email protected]]#yum groupinstall "Development Tools" -y         
[[email protected]]#yum install -y elfutils-libelf-devel bc openssl-devel ncurses-devel wget ntpdate vim net-tools      
[[email protected]
 
]#tar -xf linux-4.13.tar.gz   -C /usr/src/ 
[[email protected]]#cd /usr/src/linux-4.13/
[[email protected]]#cp /boot/config-3.10.0-327.el7.x86_64 .config         這個是針對原來的版本
[[email protected]]#sh -c 'yes "" | make oldconfig'
[[email protected]]#make -j20 bzImage 
[[email protected]]#make -j20 modules
[
 
[email protected]]#make -j20 modules_install
[[email protected]]#make install
[[email protected]]#awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg
[[email protected]]#grub2-set-default 0 
[[email protected]]#uname -a   
[[email protected]]#reboot