最新内核下载地址:https://www.kernel.org/
官方镜像内核下载地址:http://www.centos.org/
升级前请先安装一系列的包括gc++等的编译工具,确定自己目前的系统版本和内核版本.
内核升级一般用于跨版本类的升级,如不需必要升级请谨慎.如非必要请直接yum update
1、查看当前系统内核
# uname -r
2.6.32-71.e16.i686
2、下载linux-3.2.14内核包
# tar xvf linux-3.2.14.tar.bz2 #解压内核包
# cd linux-3.2.14 #进入下载的内核目录
3、配置内核并安装
#make mrproper #清除环境变量，即清除配置文件.如没有进行过内核升级可省略此步骤.
#cp /boot/config-2.6.32-71.el6.i686 .config #这里是复制当前内核文件到安装目录
#make menuconfig #在菜单模式下选择需要编译的内核模块#如果失败请检查详情安装相应组件.
#make clean #确保所有东西均保持最新状态.
#make bzImage #生成内核文件
#make modules #编译模块
#make modules_install #安装模块
#make install #安装
4、vim /etc/grub.conf，将 default=1 改为 default=0
[root@centos linux-3.2.14]# cat /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/sda3
# initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=3
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS Linux (3.2.14-rt24)
root (hd0,0)
kernel /vmlinuz-3.2.14-rt24 ro root=UUID=ab9d2166-3d58-4c30-84ed-d6d1be1e102e rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=zh_CN.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet
initrd /initramfs-3.2.14-rt24.img
title centos (2.6.32-71.el6.i686)
root (hd0,0)
kernel /vmlinuz-2.6.32-71.el6.i686 ro root=UUID=ab9d2166-3d58-4c30-84ed-d6d1be1e102e rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=zh_CN.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet
initrd /initramfs-2.6.32-71.el6.i686.img

5、重启系统,并查看内核
# reboot
# uname -r
3.2.14-rt24
6、问题及解决办法
HOSTCC scripts/basic/fixdepHOSTCC
scripts/kconfig/conf.o
*** Unable to find the ncurses libraries or the*** required header files.*** ‘make menuconfig’ requires the ncurses libraries.****** Install ncurses (ncurses-devel) and try again.***make[1]: *** [scripts/kconfig/dochecklxdialog] Error 1make: *** [menuconfig] Error 2如果出现上面的错误，记得要安装ncurses-devel，如果你设置了本地源的话，就很简单了。
# yum install ncurses-devel
到此升级内核完工