How to check the list of installed kernels and the current one

by frank · February 27, 2018

Get list of installed kernels on CentOS

$> rpm -qa kernel
kernel-2.6.32-696.13.2.el6.x86_64
kernel-2.6.32-696.el6.x86_64
kernel-4.9.75-30.el6.x86_64
kernel-2.6.32-696.16.1.el6.x86_64

$> uname -r
4.9.75-30.el6.x86_64

You don't need to downgrade or uninstall a kernel, you just modify the boot loader to load a previously one installed.

Change default=0 to default=1

Reboot and hope for the best !

It is not over.. your build might still pickup the wrong kernel headers. In my case I had to remove them.

$> yum list installed | grep kernel

... find which ones to remove

$> sudo yum remove kernel-devel-4.9.75-30.el6.x86_64
$> sudo yum remove kernel-headers-4.9.63-29.el6.x86_64

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