centos内核升级
centos升级2.6内核到3.10
在yum的ELRepo源中，有 m ain l ine（3.13.1）、 l ong- t erm（3.10.28）这2个内核版本，long-time为长期支持。
查看看当前内核版本
uname -r
安装elrepo（http://elrepo.org/tiki/tiki-index.php）
- 导入public key
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
- 安装ELRepo到CentOS-6.5中
rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
安装long-time版本内核（http://elrepo.org/linux/kernel/el6/i386/RPMS/）
yum --enablerepo=elrepo-kernel install kernel-lt -y
编辑grub.conf
vim /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 #将1修改为0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.105-1.el6.elrepo.i686)
root (hd0,0)
kernel /vmlinuz-3.10.105-1.el6.elrepo.i686 ro root=UUID=a8b6e96e-a14e-4907-9c36-e608dc2fe13a rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /initramfs-3.10.105-1.el6.elrepo.i686.img
title CentOS 6 (2.6.32-642.el6.i686)
root (hd0,0)
kernel /vmlinuz-2.6.32-642.el6.i686 ro root=UUID=a8b6e96e-a14e-4907-9c36-e608dc2fe13a rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32-642.el6.i686.img
重启，查看内核
