如何快速的将Centos6.7快速升级3.10.9

参考文档:http://www.xiexianbin.cn/linux/2015/10/15/quickly-upgrade-centos6.5-kernel-from-2.6.32-to-3.10.90/

kernel简介

在yum的ELRepo源中，有mainline（3.13.1）、long-term（3.10.90）这2个内核版本，考虑到long-term更稳定，会长期更新，所以本人推荐选择kernel-lt这个版本。

升级步骤

导入public key

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

安装ELRepo

rpm -ivh http://www.elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm

安装kernel-lt 3.10.90

这里的lt=long-term，这里推荐安装kt，下载地址：http://pan.baidu.com/s/1eQuJkcU。

yum --enablerepo=elrepo-kernel install kernel-lt -y

或者安装kernel-ml，ml=mainline。命令如下：

yum --enablerepo=elrepo-kernel install kernel-ml -y

修改启动引导顺序

修改前：

[root@xiexianbin_cn ~]# 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 do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,0)
#          kernel /boot/vmlinuz-version ro root=/dev/xvda1
#          initrd /boot/initrd-[generic-]version.img
#boot=/dev/xvda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32-573.7.1.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-573.7.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee 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
        initrd /boot/initramfs-2.6.32-573.7.1.el6.x86_64.img
title CentOS (2.6.32-431.23.3.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-431.23.3.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee 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
        initrd /boot/initramfs-2.6.32-431.23.3.el6.x86_64.img

修改后：

[root@xiexianbin_cn ~]# 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 do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,0)
#          kernel /boot/vmlinuz-version ro root=/dev/xvda1
#          initrd /boot/initrd-[generic-]version.img
#boot=/dev/xvda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.90-1.el6.elrepo.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-3.10.90-1.el6.elrepo.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee 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
        initrd /boot/initramfs-3.10.90-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-573.7.1.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-573.7.1.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee 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
        initrd /boot/initramfs-2.6.32-573.7.1.el6.x86_64.img
title CentOS (2.6.32-431.23.3.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-431.23.3.el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee 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
        initrd /boot/initramfs-2.6.32-431.23.3.el6.x86_64.img

修改前，前确认新安装安装内核的位置，然后设置default值（从0开始），一般新安装的内核在第一个位置，所以设置default=0。

重启生效

升级前kernel版本：

[root@xiexianbin_cn ~]# uname -a
Linux xiexianbin_cn 2.6.32-573.7.1.el6.x86_64 #1 SMP Tue Sep 22 22:00:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

升级后kernel版本：

[root@xiexianbin_cn ~]# uname -a
Linux xiexianbin_cn 3.10.90-1.el6.elrepo.x86_64 #1 SMP Thu Oct 1 15:15:53 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux

更多内核下载地址

http://mirrors.neterra.net/

可能存在的问题

遇到CentOs内核升级后，启动无法指定系统内核。原因是/etc/grub.conf和/boot/grub/grub.conf（为准）信息不同步导致。

cp -rf /boot/grub/grub.conf /etc/grub.conf

完毕。