FreeKB - Install a new kernel in Linux
Install a new kernel in Linux

The yum command can be used to list the currently installed kernels. In this example, the architecture of the kernel is x86_64, and the version is 3.10.0-327.el7.

~]# yum list installed kernel
Installed Packages
kernel.x86_64                      3.10.0-327.el7


Or, the uname command can be used to view the version and architecture of the current kernel.

~}# uname -r


In the prior examples, the following is the breakdown of the version.

  • 3 - major version
  • 10 - minor version
  • 0 = revision
  • 327.el7 = fix
  • x86_64 = architecture


The apt-get -u update or yum check-update commands can be used to determine if a new kernel is available. If a new kernel is available, the new kernel will be displayed in the output.

[root@server1 ~]# yum check-update | grep kernel
kernel.x86_64              updates
kernel-tools.x86_64          updates
kernel-tools-libs.x86_64          updates


The yum update kernel_name command can be used to install a new kernel. This will not overwrite the current kernel. If you cannot use yum to install a new kernel, you can download the kernel from Typically, kernels are downloaded from

[root@server1 ]# yum update kernel_name
. . .
  kernel.x86_64 0:3.10.0-514.26.2.el7


After the new kernel is installed, GRUB should automatically be configured to boot into the new kernel. This can be verified by confirming that the new kernel is the top most listing of the following command.

~]# grep ^menuentry /boot/grub2/grub.cfg
menuentry 'CentOS Linux (3.10.0-514.26.2.el7.x86_64) . . .
menuentry 'CentOS Linux (3.10.0-354.el7.x86_64) . . .


If you need to configure GRUB to boot into the prior kernel by default, use the following command. In this example, "1" represents the second menu entry of the prior command, and "0" would represent the first menu entry of the prior command.

~]# grub2-set-default 1


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