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How does the grub bootloader know?

rated 0 times [ 0] [ 0] / answers: 1 / hits: 2730 / 2 Years ago, sun, october 16, 2022, 5:28:40

I am not understanding how it comes to know which kernel image to load?
I have so many.
Once I had created my own kernel and recompiled.
How does it come to know that this is the one to load?

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ingwhin

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answered 2 Years ago tocklftime · Accepted Answer

To answer your final question:

You can put the new menuentry anywhere in /etc/grub.d/40_custom.

Then edit /etc/default/grub, and change the DEFAULT to the name of the menuentry that you added to 40_custom. (Using the name rather than a 0-indexed number is best because it allows for the possibility of more kernel images being added or deleted later: see grub2 infopage).

Then make sure to run sudo update-grub2 (or your changes won't be written to grub.cfg).

Reasoning: 40_custom gets added to grub menu underneath any kernel images that grub-update2 finds, so the order within 40_custom won't overide the kernels found by 10_linux.