How do I change the default kernel in grub in RHEL 7?

How do I change the default kernel in grub in RHEL 7?

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 find my GRUB kernel version?

2 Answers

1. Look at the /proc/version file. cat /proc/version.
2. Look at the contents of the dmesg command. dmesg | grep Linux.
3. Look in the kernel/source code directories. ls /boot.

How do I set default boot kernel in Grub?

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. GRUB 2 supports using a numeric value as the key for the saved_entry directive to change the default order in which the kernel or operating systems are loaded.

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:

Which is the default kernel in GRUB Legacy?

GRUB2 is the version of GRUB currently in use. The software was rewritten to allow plugins and expand features available in the menu system. GRUB legacy and GRUB2 are otherwise fairly similar. By default, the saved_entry value is set to the name of latest installed kernel of package type kernel.