一、导入官方Key
[root@i-ylibhc7r ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
二、升级指定的内核，下载官方源
[root@i-ylibhc7r ~]#
wget http://hkg.mirror.rackspace.com/elrepo/kernel/el6/x86_64/RPMS/kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm
--2017-11-30 20:39:14-- http://hkg.mirror.rackspace.com/elrepo/kernel/el6/x86_64/RPMS/kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm
Resolving hkg.mirror.rackspace.com... 180.150.156.88
Connecting to hkg.mirror.rackspace.com|180.150.156.88|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 40335112 (38M) [application/x-rpm]
Saving to: “kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm”
100%[=============================================================================================================================>] 40,335,112 5.80M/s in 6.6s
2017-11-30 20:39:22 (5.80 MB/s) - “kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm” saved [40335112/40335112]
小结：这里给大家介绍的是香港的kernel源，下载速度很快，一般比官方也就慢个2天左右更新。
三、安装kernel的rpm包
[root@i-ylibhc7r ~]# yum install -y kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/metalink | 6.5 kB 00:00
* base: mirrors.sohu.com
* epel: mirrors.sohu.com
* extras: mirrors.cn99.com
* rpmfusion-free-updates: mirror.lzu.edu.cn
* rpmfusion-nonfree-updates: mirror.lzu.edu.cn
* updates: mirrors.sohu.com
epel | 4.7 kB 00:00
epel/primary_db | 6.0 MB 00:04
Setting up Install Process
Examining kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm: kernel-lt-4.4.101-1.el6.elrepo.x86_64
Marking kernel-lt-4.4.101-1.el6.elrepo.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package kernel-lt.x86_64 0:4.4.101-1.el6.elrepo will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
kernel-lt x86_64 4.4.101-1.el6.elrepo /kernel-lt-4.4.101-1.el6.elrepo.x86_64 174 M
Transaction Summary
=======================================================================================================================================================================
Install 1 Package(s)
Total size: 174 M
Installed size: 174 M
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : kernel-lt-4.4.101-1.el6.elrepo.x86_64 1/1
Verifying : kernel-lt-4.4.101-1.el6.elrepo.x86_64 1/1
Installed:
kernel-lt.x86_64 0:4.4.101-1.el6.elrepo
Complete!
四、、编辑grub.conf文件，修改Grub引导顺序
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因为一般新安装的内核在第一个位置，所以设置default=0，表示启动新内核
五、重启服务器
总结：
1、经过本人验证，这个最快升级内核的方法，参考网址：http://blog.csdn.net/reyleon/article/details/52229293
2、官方kernel源地址：http://elrepo.reloumirrors.net/kernel/
3、香港的kernel源地址：http://hkg.mirror.rackspace.com/elrepo/kernel/
