This post will assist you to determine the OS and kernel version of the CentOS or RHEL system you are running. Knowing the exact kernel version or OS version is sometimes necessary while troubleshooting an issue or providing information to the support team. Dec 21, 2018  Boot with old kernel version? Revert to previous kernel version? How to set default boot kernel in linux? Change the default boot entry for kernel? Boot with old kernel version? Revert to previous kernel version? Skip to content. Friday, September 20. How to set default boot kernel on Linux ( CentOS / RHEL 7 ) admin December 21, 2018 3.

How to set default boot kernel in linux? How to change the default boot entry for kernel ? How to boot with old kernel version ? How to revert to previous kernel version ?

In my last article I had shared the commands to check if server is physical or virtual in Linux or Unix . 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.

Rhel 7 Kernel Versions

By default, the saved_entry value is set to the name of latest installed kernel of package type kernel. This is defined in /etc/sysconfig/kernel by the UPDATEDEFAULT and DEFAULTKERNEL directives. The file can be viewed by the root user as follows:

When new kernels are installed, they should include a new stanza in the bootloader configuration file, /boot/grub2/grub.conf. The default stanza is based on the saved_entry directive in the /boot/grub2/grubenv file.

Centos Kernel Version List

For example currently my system is configured is to boot from 3.10.0-957.1.3.el7.x86_64

Bluetooth speaker drivers windows 7. And the Windows 7 PC was able to connect to other Bluetooth devices, such as mice or keyboards.CAUSE:Even though a Windows 7 PC may have a working Bluetooth driver that connects to some Bluetooth devices (like mice or keyboards), a Windows 7 PC may not have the necessary A2DP & AVRCP (audio-capable) Bluetooth software & drivers installed. No driver found.”It may be worth noting that I had no problem connecting my Bluetooth audio device to my cell phone or Windows XP PC.

Now currently I have a different kernel loaded on my system

This is because I just installed a newer kernel on my system but since I have not rebooted my node, still old kernel is loaded.

So after reboot the kernel version provided in “saved_entry” will be loaded. Now after reboot as expected my loaded kernel has changed

How to set default boot kernel?

Centos 7 Linux Kernel Version 2 4

The boot configuration when using GRUB 2 is in the /boot/grub2/grub.cfg file. 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.

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To list the available menu entries, run the following command as root:

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. To specify which kernel or operating system should be loaded first i.e. to set default boot kernel, pass its number to the grub2-set-default command which sets the default boot menu entry for all subsequent boots.

For example to set default boot kernel let us use numeric value. Now as per our /etc/grub2.cfg we have two menuentry for kernel

where “entry 0” is loaded currently (3.10.0-957.1.3.el7.x86_64).

Let us change it to old or previous kernel version (3.10.0-693.el7.x86_64)

Linux

Validate the changes

Next rebuild your GRUB2 configuration

How To Check Kernel Version Linux

Now after rebooting the node, we see the old kernel has successfully loaded

Lastly I hope the steps from the article to set default boot kernel on Linux was helpful. So, let me know your suggestions and feedback using the comment section.