On Tue, 2022-03-01 at 14:37 -0700, Chris Murphy wrote: > Summary---------- > Most all Fedora variants (except Cloud) have a GRUB menu entry > containing the word "rescue". This kernel+initramfs pair are never > updated for the life of a Fedora installation. And they quickly > become > stale as a Fedora installation ages. This kernel's modules are > eventually deleted, and if selected at boot time, the typical user > experience is a dracut shell. > > Basic background------------- > (skip this section if you know how it works) > During a new installation, a single kernel version is installed. e.g. > > vmlinuz-5.17.0-0.rc4.96.fc36.x86_64 which is then duplicated as e.g. > vmlinuz-0-rescue-3a86878de5d649a983916543ece7bb7e. > > Each of those (identical) kernels has an initramfs file: > > initramfs-5.17.0-0.rc4.96.fc36.x86_64.img > initramfs-0-rescue-3a86878de5d649a983916543ece7bb7e.img > > The sole difference is the first one is a smaller host-only > initramfs, > the second one is a larger no host-only initramfs created with > `dracut > -N`. The bigger one just contains a bunch of extra kernel modules and > dracut scripts, ostensibly to make it more likely to boot a system > with some change in hardware that the host-only initramfs doesn't > contain. The size of this rescue initramfs is around 100 MiB, with > the > common day to day "host only" initramfs being around 33 MiB. [1] > > As the system is updated, additional kernel versions are installed. > dnf.conf contains installonly_limit=3, which results in a maximum of > three kernel versions being installed at a time. Once a fourth kernel > is installed, the first kernel and its modules are removed from > /usr/lib/modules. The rescue kernel+initramfs pair are never updated > or upgraded, even during system upgrades. Hello, I found this email on google , thank you for this "basic background" lesson . He also have bug report about this [1], in resume we can regenerate rescue entry just by delete /boot/*-0-rescue-* files and reinstall the kernel . But isn't missing inst.rescue boot option [2] ? I also recently did a scratch to fix this bug [3] Best regards, [1] https://bugzilla.redhat.com/show_bug.cgi?id=1768132 https://bugzilla.redhat.com/show_bug.cgi?id=1768132#c35 [2] https://github.com/rhinstaller/anaconda/blob/master/docs/boot-options.rst#instrescue [3] https://src.fedoraproject.org/fork/sergiomb/rpms/dracut/blob/rawhide/f/0001-1768132-if-new-Fedora-Release-regenerate-rescue-entr.patch -- Sérgio M. B. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
