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Re: removing modules

On Sat, Jul 03, 2021 at 05:50:44PM +0100, mick crane wrote:
> I looked because "apt upgrade" failed to install things in /boot
> because no room left. I deleted the oldest kernel stuff of the 3 there
> and "apt upgrade" worked.

Kernel is here:

$ du -sxh /boot/vmlinuz-5.10.0-0.bpo.7-amd64 
6.5M    /boot/vmlinuz-5.10.0-0.bpo.7-amd64

Modules are here:

$ du -sxh /lib/modules/5.10.0-0.bpo.7-amd64/
290M    /lib/modules/5.10.0-0.bpo.7-amd64/

You must mean initrd, which contains selected kernel modules and is used
in the boot process:

$ du -sxh /boot/initrd.img-5.10.0-0.bpo.7-amd64 
36M     /boot/initrd.img-5.10.0-0.bpo.7-amd64

> I was thinking then to remove the unwanted modules to make the kernels smaller.

It does not work like this, no amount of modprobing or removing *ko
files would make an installed kernel smaller.
You could build your own kernel, of course, then things would be

> If remove modules from kernel are the gone or are they still on disk and could be put back ?

Modprobe, insmod and rmmod merely change the state of the running
kernel (i.e. - in-memory).

What you probably want described at initramfs.conf(5), MODULES section.


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