yum升级centos7内核

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转自：http://blog.csdn.net/silentwolfyh/article/details/52047780

查看内核

[root@localhost ~]# uname -r
3.10.0-514.16.1.el7.x86_64

导入key
[root@localhost ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

安装elrepo的yum源
[root@localhost ~]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
Retrieving http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
Preparing...                          ################################# [100%]
Updating / installing...
   1:elrepo-release-7.0-2.el7.elrepo ################################# [100%]

安装内核
[root@localhost ~]# yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml
Loaded plugins: fastestmirror
elrepo                                                                                                                                                      | 2.9 kB 00:00:00
elrepo-kernel                                                                                                                                               | 2.9 kB 00:00:00
(1/2): elrepo/primary_db                                                                                                                                    | 466 kB 00:00:01
(2/2): elrepo-kernel/primary_db                                                                                                                             | 1.7 MB 00:00:02
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* elrepo: ftp.ne.jp
* elrepo-kernel: ftp.ne.jp
* extras: mirror.bit.edu.cn
* updates: mirrors.btte.net
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:4.11.0-1.el7.elrepo will be installed
---> Package kernel-ml-devel.x86_64 0:4.11.0-1.el7.elrepo will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===================================================================================================================================================================================
Package                                     Arch                               Version                                            Repository                                 Size
===================================================================================================================================================================================
Installing:

查看默认启动顺序
[root@localhost ~]# awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg
CentOS Linux (4.11.0-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-514.16.1.el7.x86_64.debug) 7 (Core)
CentOS Linux (3.10.0-514.16.1.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-1d2d54eac54a4377b4ff772d2339f0cf) 7 (Core)

默认启动的顺序是从0开始，新内核是从头插入（目前位置在0，而4.4.4的是在1），所以需要选择0。
[root@localhost ~]# grub2-set-default 0

重启即可

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