因为要装Docker所以需要升级下Linux内核
记录下命令备忘
导入public key
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
安装ELRepo到CentOS 6.6中
rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
安装长期支持版本kernel
yum --enablerepo=elrepo-kernel install kernel-lt -y
编辑grub.conf文件，修改Grub引导顺序
vim /etc/grub.conf
确认刚刚安装的内核的位置，然后将default修改一下。
default=0
timeout=5
splashimage=(hd0,2)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.71-1.el6.elrepo.x86_64)
root (hd0,2)
kernel /boot/vmlinuz-3.10.71-1.el6.elrepo.x86_64 ro root=UUID=4cfe1c56-3703-4d36-b57f-7efc1943c6f4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=noop
initrd /boot/initramfs-3.10.71-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-504.12.2.el6.x86_64)
root (hd0,2)
kernel /boot/vmlinuz-2.6.32-504.12.2.el6.x86_64 ro root=UUID=4cfe1c56-3703-4d36-b57f-7efc1943c6f4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=noop
initrd /boot/initramfs-2.6.32-504.12.2.el6.x86_64.img
title CentOS (2.6.32-358.23.2.el6.x86_64)
root (hd0,2)
kernel /boot/vmlinuz-2.6.32-358.23.2.el6.x86_64 ro root=UUID=4cfe1c56-3703-4d36-b57f-7efc1943c6f4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=noop
initrd /boot/initramfs-2.6.32-358.23.2.el6.x86_64.img
title CentOS (2.6.32-358.el6.x86_64)
root (hd0,2)
kernel /boot/vmlinuz-2.6.32-358.el6.x86_64 ro root=UUID=4cfe1c56-3703-4d36-b57f-7efc1943c6f4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet elevator=noop
initrd /boot/initramfs-2.6.32-358.el6.x86_64.img
新装的内核位置为0，所以讲default修改为0，保存退出重启。
重启后检查内核
uname -r
参考
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