F22 - How to remove old kernel?

[lilcarp87]

In F21, I usually put "yum remove kernel" and it worked great after an update. Now I tried to do the same in F22 but those lines are still on. How can I do it successfully? I also tried "dnf remove kernel" but no effect.

Please guide me how. Thanks in advance!

[paroxitono8]

Did you try the simple way: rpm -Uvh kernel? It worked always to me.


paroxitono8

[marko]

dnf remove kernel works here, but the problem is it offers to remove them all

dnf remove kernel
Dependencies resolved.

Removing:
kernel x86_64 4.0.4-300.fc22 @System 0
kernel x86_64 4.0.4-301.fc22 @System 0
kernel x86_64 4.0.4-303.fc22 @System 0


Transaction Summary
===========================================
Remove 3 Packages

Installed size: 0
Is this ok [y/N]: N
Operation aborted.

so remove the kernel specifically:

dnf remove kernel-4.0.4-300.fc22.x86_64

Removing:
kernel x86_64 4.0.4-300.fc22 @System 0

Transaction Summary
==========================================
Remove 1 Package

Installed size: 0
Is this ok [y/N]: n
Operation aborted.

[lsatenstein]

Do not use dnf to remove kernels. YUM always keeps 3 versions. Current, one previous, and one recovery version.

The total does not fill up /boot, which could house 15 versions. Overhead is one or two megabytes (not gigs) for the total of the parameter files. (initab)

When a new kernel is installed, yum or dnf will remove the oldest kernel via the kernel's rpm scripts.

[marko]

You can also tweak the installonly_limit to some number in the /etc/dnf/dnf.conf file, this does the same thing as the old yum installonly_limit in /etc/yum.conf

The default is 3 so you can get it to keep fewer kernels:

installonly_limit=2

[PabloTwo]

Just reading through the F22 release-notes after a fedup from F21.i386 > F22.i386. Yes, dnf will definitely wipe away all kernels, including the running kernel, if you mess up with that command.

3.4.1.9. dnf will remove kernels
kernel packages are not protected by dnf. Unlike with yum, you can remove all kernel packages, including the running package, if you direct it to. Be cautious with removing kernels, and specify the full version and release when removing them for best results.

[robertg]

Thanks for all the advice on this issue it's much appreciated, I was able to follow this post with a simple method to remove the unwanted kernel, https://ask.fedoraproject.org/en/que...ion-from-grub/

After that I just use the Grub customizer to remove the kernel entry

Thanks so much for all the help