CentOS升级kernel

CentOS升级kernel

升级命令：

 yum update kernel
 yum update kernel-devel
 yum update kernel-firmware
 yum update kernel-headers

查看内核版本命令：

 uname -r

Linux 内核配置文件:

 [root@yjn ~]# 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 do not have a /boot partition.  This means that
 #          all kernel and initrd paths are relative to /, eg.
 #          root (hd0,)
 #          kernel /boot/vmlinuz-version ro root=/dev/vda1
 #          initrd /boot/initrd-[generic-]version.img
 #boot=/dev/xvda
 default=
 timeout=
 splashimage=(hd0,)/boot/grub/splash.xpm.gz
 hiddenmenu
 title CentOS (2.6.-696.23..el6.x86_64)
     root (hd0,)
     kernel /boot/vmlinuz-2.6.-696.23..el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF- rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
     initrd /boot/initramfs-2.6.-696.23..el6.x86_64.img
 title CentOS (2.6.-696.10..el6.x86_64)
     root (hd0,)
     kernel /boot/vmlinuz-2.6.-696.10..el6.x86_64 ro root=UUID=94e4e384-0ace-437f-bc96-057dd64f42ee rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF- rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
     initrd /boot/initramfs-2.6.-696.10..el6.x86_64.img

default=0 这个就是制定选择那个版本的内核。 
title默认的是0开始，选择对应的版本后，reboot。

问题

如果升级有问题，请检查一下几个文件：

1.linux内核配置文件要有相应版本

2./boot/

3./lib/module/版本

以上目录如果更新的不完整，将正确的拷贝过来，重启即可。

原理