升级CentOS内核

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参考资料:
       http://my.oschina.net/denglz/blog/487332?p={{page}}
       http://elrepo.org/tiki/tiki-index.php

网上有不少升级CentOS内核的文章,如《CentOS 6.5 升级内核到 3.10.28》,大部分都是下载源码编译,有点麻烦。

在yum的ELRepo源中,有mainline(3.13.1)、long-term(3.10.28)这2个内核版本,考虑到long-term更稳定,会长期更新,所以选择这个版本。

1、导入public key

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

2、安装ELRepo到CentOS-6.8中

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

3、安装**kernel-lt(lt=long-term)**

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

或者安装kernel-ml(ml=mainline)

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

4、编辑grub.conf文件,修改Grub引导顺序

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/sda1
#          initrd /boot/initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.28-1.el6.elrepo.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-3.10.28-1.el6.elrepo.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
        initrd /boot/initramfs-3.10.28-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-431.3.1.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-431.3.1.el6.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
        initrd /boot/initramfs-2.6.32-431.3.1.el6.x86_64.img
title CentOS (2.6.32-431.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=0a05411f-16f2-4d69-beb0-2db4cefd3613 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
        initrd /boot/initramfs-2.6.32-431.el6.x86_64.img

确认刚安装好的内核在哪个位置,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。 5、重启,查看内核版本号

[root@dev ~]# uname -r
4.7.2-1.el6.elrepo.x86_64
 

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