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h1. GRUB 2

h2. Recreate Grub-Menu

*not yet tested*

for BIOS-systems

<pre><code class="bash">

grub2-mkconfig -o /boot/grub2/grub.cfg

</code></pre>

on EFI-systems 

<pre><code class="bash">

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

</code></pre>

h2. remember last choice on reboot

taken from: https://nocache.org/p/make-grub-grub2-remember-last-choice-on-linux

<pre><code class="bash">

cp /etc/default/grub /etc/default/grub.bak

vim /etc/default/grub

</code></pre>

add or edit the parameters @GRUB_DEFAULT@ and @GRUB_SAVEDEFAULT@

<pre><code class="ini">

GRUB_DEFAULT=saved

GRUB_SAVEDEFAULT=true

</code></pre>

generate GRUB configuration

<pre><code class="bash">

grub2-mkconfig -o /boot/grub2/grub.cfg

</code></pre>

h2. make detailed boot-information visible

while it's possible to edit '/boot/grub2/grub.cfg' and also '/etc/default/grub' the better approach is to:

<pre><code class="bash">

plymouth-set-default-theme details

dracut -f

</code></pre>