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This is interesting, why does Fedora have both kernels as boot options?

asked 2017-12-12 17:18:00 -0500

byerlythomas2 gravatar image

updated 2017-12-12 17:21:26 -0500


I recently upgraded my system and rebooted my system. I barely noticed it but I did, I noticed that there were three boot options for Fedora instead of two.

Fedora (4.14.3-300.fc27.x86_64) 27 (Workstation Edition)
Fedora (4.14.9-300.fc27.x86_64) 27 (Workstation Edition)
Fedora (0-rescue-blahblahblahblahblah) 27 (Workstation Edition)

I looked at it once again and thought ok the first two are almost the exact same. I had no idea what the "4.14.3-300" was or why they were different. I thought to myself "maybe that has something to do with the linux kernel". So i booted into one of them and ran the command uname -r and sure enough 4.13.9-300.fc27.x86_64 was the output. I tried booting with both of em and I am required to enter my encryption passphrase for both so I figure everythings okay. I knew that upgrading my system caused this. But the question is why didn't my system delete the old or "obsolete" kernel? It kept the old one. Thanks a lot!

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answered 2017-12-12 17:26:21 -0500

fcomida gravatar image

If something goes wrong with the new kernel and cannot boot, you can boot with the old kernel that you know is working.

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That's pretty smart! Thanks!

byerlythomas2 gravatar imagebyerlythomas2 ( 2017-12-12 17:32:03 -0500 )edit

By default, dnf will keep the latest 3 kernel versions. Also, the rescue kernel option will stay there forever, unless you take to specific steps to replace it.

ssieb gravatar imagessieb ( 2017-12-12 18:23:59 -0500 )edit

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Asked: 2017-12-12 17:18:00 -0500

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Last updated: Dec 12 '17