1. 查看内核版本参考命令：
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# rpm -qa |grep -i centos-release
centos-release-7-3.1611.el7.centos.x86_64
2. 目的安装下面这个版本内核：
kernel-3.10.0-862.11.6.el7.1.x86_64.rpm
下载地址：https://centos.pkgs.org/7/puias-computational-x86_64/kernel-3.10.0-862.11.6.el7.1.x86_64.rpm.html
3. 查看已安装内核版本
[root@localhost boot]# rpm -qa |grep kernel
kernel-3.10.0-514.el7.x86_64
kernel-tools-libs-3.10.0-693.5.2.el7.x86_64
kernel-tools-3.10.0-693.5.2.el7.x86_64
kernel-3.10.0-693.5.2.el7.x86_64
kernel-3.10.0-514.26.2.el7.x86_64
4. 卸载新版本内核
[root@localhost boot]# rpm -e kernel-3.10.0-514.el7.x86_64
5.安装需要的内核版本
rpm -ivh kernel-3.10.0-862.11.6.el7.1.x86_64.rpm