how to create grub rescue kernel entry?

[Andre Robatino]

The F24 lives don't contain a rescue kernel or generate the corresponding
grub entry (see https://bugzilla.redhat.com/show_bug.cgi?id=1317709 ). Is
there a way to install the rescue kernel if it was not done during the
initial install? (The package dracut-config-rescue was not installed, and
I've installed that manually.) I've nominated this bug as a FE, but it would
be less important if there's a way to fix the problem after install.

[Dennis Gilmore]

On Friday, March 18, 2016 1:47:43 AM CDT Andre Robatino wrote:
>  The F24 lives don't contain a rescue kernel or generate the
> corresponding
>  grub entry (see https://bugzilla.redhat.com/show_bug.cgi?id=1317709 ). Is
>  there a way to install the rescue kernel if it was not done during the
>  initial install? (The package dracut-config-rescue was not installed, and
>  I've installed that manually.) I've nominated this bug as a FE, but it would
>  be less important if there's a way to fix the problem after install. --
>  test mailing list
>  test(a)lists.fedoraproject.org
>  To unsubscribe:
>  http://lists.fedoraproject.org/admin/lists/[e-mail] 
I should be generated when you do a kernel install next.

all it does is copies a kernel and make s a generic initramfs for it. its 
supposed to be a known working kernel.  though I do wonder how my resuce 
kernel from 2013 will do with a fedora 24 system

Dennis

[Michal Jaegermann]

On Fri, Mar 18, 2016 at 11:09:49AM -0500, Dennis Gilmore wrote:
>  
>  I should be generated when you do a kernel install next. 
....
>  
>  though I do wonder how my resuce 
>  kernel from 2013 will do with a fedora 24 system 
As you say - if you will remove an existing rescue kernel and its
initrams just before installing a new kernel then a rescue will be
"refreshed" from the one you are now installing.  Assuming that you
installed required dracut support and you do not have
'dracut_rescue_image="no"' in your dracut configuration.

This actually worked wherever I tried.

   Michal

[Kevin Fenzi]

On Fri, 18 Mar 2016 11:52:44 -0600
Michal Jaegermann <michal.jnn(a)gmail.com&gt; wrote:

>  On Fri, Mar 18, 2016 at 11:09:49AM -0500, Dennis Gilmore wrote:
>  > 
>  > I should be generated when you do a kernel install next.  
>  ....
>  > 
>  > though I do wonder how my resuce 
>  > kernel from 2013 will do with a fedora 24 system  
>  
>  As you say - if you will remove an existing rescue kernel and its
>  initrams just before installing a new kernel then a rescue will be
>  "refreshed" from the one you are now installing.  Assuming that you
>  installed required dracut support and you do not have
>  'dracut_rescue_image="no"' in your dracut configuration.
>  
>  This actually worked wherever I tried. 
I removed the entry from my grub2-efi.cfg and it never came back until
I realized that I hadn't removed the rescue stuff from /boot. if you
have an old rescue kernel and initramfs it won't make a new one. 

Removing those and installing a new kernel did make it work. 

So, to cleanly remove it: 

* remove the grub2* entry
* rm the stuff from /boot
* dnf remove dracut-config-rescue

kevin

[Sérgio Basto]

On Sex, 2016-03-18 at 01:47 +0000, Andre Robatino wrote:
>  The F24 lives don't contain a rescue kernel or generate the
>  corresponding
>  grub entry (see https://bugzilla.redhat.com/show_bug.cgi?id=1317709
>  ). Is
>  there a way to install the rescue kernel if it was not done during
>  the
>  initial install? (The package dracut-config-rescue was not installed,
>  and
>  I've installed that manually.) I've nominated this bug as a FE, but
>  it would
>  be less important if there's a way to fix the problem after install. 
I remember that ask have this question and the answer. 

/etc/kernel/postinst.d/51-dracut-rescue-postinst.sh $(uname -r)
/boot/vmlinuz-$(uname -r)

works for me in F23 .

after google it: "how to create grub rescue
site:ask.fedoraproject.org"best reference is : 
https://ask.fedoraproject.org/en/question/40409/cant-boot-into-rescue-m
ode-how-to-re-generate-initramfs/

Best regards,
-- 
Sérgio M. B.

[Andre Robatino]

>  /etc/kernel/postinst.d/51-dracut-rescue-postinst.sh $(uname -r)
>  /boot/vmlinuz-$(uname -r) 
Thanks. I ran this command in F24 and it created the rescue mode files in /boot. Looking
at /boot/grub2/grub.conf indicated that the rescue mode grub entry was the first on the
list, so I ran "grub2-mkconfig -o /boot/grub2/grub.conf" manually and it put the
rescue mode entry in the proper location (after all the non-rescue kernels).

[Andre Robatino]

When I used this method to create new rescue mode files for my F23 box (which already had
a rescue mode entry), I got an additional rescue mode entry at the top of the grub menu.
This was fixed by manually editing /boot/grub2/grub.conf to delete the new entry (as
mentioned in
https://ask.fedoraproject.org/en/question/40409/cant-boot-into-rescue-mod...
).

[Andre Robatino]

Correction, it should be "grub2-mkconfig -o /boot/grub2/grub.cfg" (not
grub.conf).