Linux - Edit bootgrub2grub config grub2 mkconfig, Grub2-mkconfig is used to regenerate file

Edit bootgrub2grub config grub2 mkconfig

When you make changes in /etc/default/grub run below command to update /boot/grub2/grub.cfg

 # cat /etc/default/grub

   GRUB_HIDDEN_TIMEOUT=0
   GRUB_TIMEOUT=20

Once you change timeout or add any additional parameter in CMDLINE

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

why do we edit /etc/default/grub?
Changes or edit in grub.cfg will be lost anytime when grub2-mkconfig is used to regenerate the file, so care must be taken to reflect any manual changes in /etc/default/grub as well.

Run if you change or append any parameters in GRUB_CMDLINE_LINUX

 # mkinitrd

You can also use dracut version instead of mkinitrd, below is an example

 # dracut -kver 4.1x.8.-default

Troubleshoot with boot logs

 # journalctl --this-boot --outout=short-monotonic --no-hostname | grep -i 'swap'

 # journalctl --catalog --boot

The topic on Linux - Edit bootgrub2grub config grub2 mkconfig is posted by - John

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