How do I change the default kernel in grub2?

How do I change the default kernel in grub2?

How to change the default kernel in GRUB for RHEL and CentOS

1. Step 1: Get installed kernel versions.
2. Step 2: Use grub2-set-default command.
3. Step 3: Check grubenv file.
4. Step 4: Rebuild Grub.cfg file.
5. Step 5: Restart Server.

How do I set a default kernel?

As mentioned in the comments, you can set the default kernel to boot into using the grub-set-default X command, where X is the number of the kernel you want to boot into. In some distributions you can also set this number by editing the /etc/default/grub file and setting GRUB_DEFAULT=X , and then running update-grub .

How do I set grub2 as default?

You can also refer to it by the /etc/grub2. cfg file which is a symbolic link. To force a system to always use a particular menu entry and to set default boot kernel, use the menu entry name as the key to the GRUB_DEFAULT directive in the /etc/default/grub file.

How do I change my default kernel Arch?

How to switch kernels on Arch Linux

1. Step 1: Install the kernel of your choice. You can use the pacman command to install the Linux kernel of your choice.
2. Step 2: Tweak the grub configuration file to add more kernel options.
3. Step 3: Re-generate the GRUB configuration file.

How do I change the default kernel in RHEL 6?

Change the value of “default” to the value of the desired kernel to boot by default, that correspond to any of the installed kernels. Set the value from “0” to the desired one corresponding to the default kernel you need to boot with.

How to set Grub to boot from an older kernel?

I installed a mainline kernel for testing purposes. I would like to set grub to boot from the older kernel by default. I know I can set the GRUB_DEFAULT=0 setting for the first page of grub but how do I set it to boot by default from one kernel in the second page (Advanced page)?

Which is the default Grub entry in Ubuntu?

Now that an Advanced menu is default in Ubuntu, you’ll need to select it before the kernel you want using the > character. in /etc/default/grub and re-run sudo update-grub. It is important to note that for the GRUB menu entries numbering starts with 0. Therefore the 1 above points to the Advanced menu.

How to set the default kernel in Ubuntu?

Setting that to be the default kernel is simple. However, you MUST prepend ‘Advanced options for Ubuntu’ to the kernel name as shown below since Ubuntu makes use of sub menus in the kernel listing. So set the desired kernel by running:

Where do I find the kernel number in Grub?

You can usually find the right number by looking for menuentry lines in /boot/grub/grub.cfg, like so: You’ll see each kernel listed with the name that is shown in the GRUB boot menu. The first one is 0, the second is 1, and so on.