[CentOS] What happened if install a el7 package on a el6 system

Reproduce steps:

  1. Prepare a CentOS 6.3 system on a VM (make sure grubby-7.0.15-3.el6.x86_64 has been installed)
  2. Download kernel-3.10.0-327.el7.x86_64.rpm from http://vault.centos.org/
  3.
    3.1 Create a symlink with "ln -s /sbin/new-kernel-pkg /usr/sbin/new-kernel-pkg"
    3.2 Install kernel-3.10.0-327.el7.x86_64.rpm with "rpm -i --force --nodeps"
  4. Reboot

Then we'll see the system boot and running as normal. And /etc/grub.conf updated automatically.

> -----Original Messages-----
> From: wuzhouhui <wuzhouhui14 at mails.ucas.ac.cn>
> Sent Time: 2019-05-07 16:05:54 (Tuesday)
> To: centos at centos.org
> Cc: 
> Subject: [CentOS] What happened if install a el7 package on a el6 system
> 
> Hi,
> 
> Recently, I encountered a interesting phenomenon that CentOS 6.3
> running as normal even if I (my colleague, actually) installed a
> kernel that build for CentOS 7.x (e.g. kernel-3.10.0-327.el7.x86_64.rpm).
> 
> I found kernel is mismatch accidentally when I using "uname -r" to
> check kernel version. So my question is what the harmness we will
> get if I install a el7 rpm into a el6 system?
> 
> Thanks.
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