为什么Linux升级时不升级内核

RedHat/CentOS使用 [backcolor=transparent]yum update 更新时，默认会升级内核。但有些服务器硬件在升级内核后，新的内核可能会认不出某些硬件，要重新安装驱动，很麻烦。所以在生产环境中不要轻易的升级内核，除非您确定升级内核后不会出现麻烦的问题。
如果使用yum update更新时不升级内核，有两种方法：

方法一


直接在yum的命令后面加参数，这个命令只生效一次：

1. [backcolor=transparent]# yum update --exclude=kernel*

1. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] uname [backcolor=transparent]-[backcolor=transparent]r
2. [backcolor=transparent]2.6[backcolor=transparent].[backcolor=transparent]32[backcolor=transparent]-[backcolor=transparent]504.el6.x86[backcolor=transparent]_64
3. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] cat [backcolor=transparent]/[backcolor=transparent]etc[backcolor=transparent]/[backcolor=transparent]issue
4. [backcolor=transparent]CentOS[backcolor=transparent] release [backcolor=transparent]6.6[backcolor=transparent] [backcolor=transparent]([backcolor=transparent]Final[backcolor=transparent])
5. [backcolor=transparent]Kernel[backcolor=transparent] \r on an \m

1. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] cp [backcolor=transparent]/[backcolor=transparent]etc[backcolor=transparent]/[backcolor=transparent]yum[backcolor=transparent].[backcolor=transparent]conf [backcolor=transparent]/[backcolor=transparent]etc[backcolor=transparent]/[backcolor=transparent]yum[backcolor=transparent].[backcolor=transparent]conf[backcolor=transparent].[backcolor=transparent]bak

1. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] vi [backcolor=transparent]/[backcolor=transparent]etc[backcolor=transparent]/[backcolor=transparent]yum[backcolor=transparent].[backcolor=transparent]conf

1. [backcolor=transparent]exclude[backcolor=transparent]=[backcolor=transparent]kernel[backcolor=transparent]*

1. [backcolor=transparent][[backcolor=transparent]root@localhost yum[backcolor=transparent].[backcolor=transparent]repos[backcolor=transparent].[backcolor=transparent]d[backcolor=transparent]]#[backcolor=transparent] yum update

1. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] uname [backcolor=transparent]-[backcolor=transparent]r
2. [backcolor=transparent]2.6[backcolor=transparent].[backcolor=transparent]32[backcolor=transparent]-[backcolor=transparent]504.el6.x86[backcolor=transparent]_64
3. [backcolor=transparent][[backcolor=transparent]root@localhost [backcolor=transparent]~]#[backcolor=transparent] cat [backcolor=transparent]/[backcolor=transparent]etc[backcolor=transparent]/[backcolor=transparent]issue
4. [backcolor=transparent]CentOS[backcolor=transparent] release [backcolor=transparent]6.8[backcolor=transparent] [backcolor=transparent]([backcolor=transparent]Final[backcolor=transparent])
5. [backcolor=transparent]Kernel[backcolor=transparent] \r on an \m