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Proper way to update grub.cfg when removing obsolete kernels
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A.S. Pushkin
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PostPosted: Mon Mar 11, 2019 4:16 pm    Post subject: Proper way to update grub.cfg when removing obsolete kernels Reply with quote

I hate to ask this, but I've been removing obsolete kernels.

I wary of editing grub.cfg after removing obsolete kernels for fear of
corrupting the file.

What is the best way to do this without damaging my installation.
I've already unmerged kernel sources, respective files in /boot and /lib/modules.

TIA
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eccerr0r
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PostPosted: Mon Mar 11, 2019 4:24 pm    Post subject: Reply with quote

Technically speaking, if you're using grub2 you should be using grub-mkconfig each time you add a new kernel and completely overwrite your old file.

... which is no good if you had to make manual edits.

The trick is to get grub-mkconfig to automatically "edit" or add the commands needed to make it automatically generate a grub.conf you need. What manual edits did you need to make?
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kajzer
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PostPosted: Mon Mar 11, 2019 4:35 pm    Post subject: Reply with quote

Nothing to worry about editing grub.cfg
I keep two kernels, once I compile new one, I just edit the numbers.
For example, If you had 5.0.0 and 5.0.1 comes out you just replace 5.0.0 to be 5.0.1
I have 'previous kernel' in the menu so I edit that one as well and do the same thing, in this case that one would be 5.0.0
And you keep going like that.

Code:
linux   /boot/vmlinuz-5.0.1-gentoo root=/dev/sda1 rootfstype=ext4
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Jaglover
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PostPosted: Mon Mar 11, 2019 4:41 pm    Post subject: Reply with quote

My current kernel is always bzImage and the backup is always bzImage.old. No need to reconfigure the bootloader.
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Syl20
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PostPosted: Mon Mar 11, 2019 4:54 pm    Post subject: Re: Proper way to update grub.cfg when removing obsolete ker Reply with quote

To get the same behaviour, I use symlinks. Kernel's "make install" updates them.

A.S. Pushkin wrote:
I wary of editing grub.cfg after removing obsolete kernels for fear of
corrupting the file.

Well... Make backups.
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Jaglover
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PostPosted: Mon Mar 11, 2019 5:02 pm    Post subject: Reply with quote

https://wiki.gentoo.org/wiki/GRUB2_Quick_Start#Manual_configuration

To corrupt this one you need some sort of accelerator ... see local liqueur store perhaps.
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josedb
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PostPosted: Wed Mar 13, 2019 5:05 pm    Post subject: Reply with quote

why not?
grub-mkcofig -o /boot/grub/grub.cgf

are you using software raid?

https://wiki.gentoo.org/wiki/GRUB2
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Jaglover
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PostPosted: Wed Mar 13, 2019 6:04 pm    Post subject: Reply with quote

Quote:
grub-mkcofig -o /boot/grub/grub.cgf

Yes, this is what binary distros do. In Gentoo we can do better than that.
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josedb
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PostPosted: Wed Mar 13, 2019 6:09 pm    Post subject: Reply with quote

Jaglover wrote:
Quote:
grub-mkcofig -o /boot/grub/grub.cgf

Yes, this is what binary distros do. In Gentoo we can do better than that.


Binary distros don't usually require the user to perform such operations as it's automatically made when kernel is updated. You can use this software to speed up the configuration, and you are still able to edit the config files then.
you can write everything by hand if it is a whim and you want to waste time. your choise.
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Jaglover
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PostPosted: Wed Mar 13, 2019 6:16 pm    Post subject: Reply with quote

Yes, you can generate a clumsy huge file with totally unnecessary content - if you are lucky then grub-mkcofig won't mess it up and it will work.
Or you can write a simple elegant conf file with a few lines in it.
Your computer, your choice. I'm running Gentoo, BTW. One of reasons doing so is not having cruft in my computer.
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josedb
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PostPosted: Wed Mar 13, 2019 6:30 pm    Post subject: Reply with quote

Jaglover wrote:
Yes, you can generate a clumsy huge file with totally unnecessary content - if you are lucky then grub-mkcofig won't mess it up and it will work.
Or you can write a simple elegant conf file with a few lines in it.
Your computer, your choice. I'm running Gentoo, BTW. One of reasons doing so is not having cruft in my computer.


https://i.imgur.com/bCmND0f.png
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Jaglover
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PostPosted: Wed Mar 13, 2019 6:36 pm    Post subject: Reply with quote

josedb wrote:
Jaglover wrote:
Yes, you can generate a clumsy huge file with totally unnecessary content - if you are lucky then grub-mkcofig won't mess it up and it will work.
Or you can write a simple elegant conf file with a few lines in it.
Your computer, your choice. I'm running Gentoo, BTW. One of reasons doing so is not having cruft in my computer.


https://i.imgur.com/bCmND0f.png


Never heard before a bootloader can read a png file. 8O

For sake of truth, I do not use Grub2 myself. I see no point installing tens of megabytes of software just to load kernel during boot. It can be accomplished in a much simpler and elegant way.
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