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How To Upgrade Linux Kernel on Centos 7
In this guide, we want to teach you How To Upgrade Linux Kernel on Centos 7.
Linux kernel is a free, open-source, monolithic, modular, Unix-like operating system kernel. It is the main component of the Linux operating system (OS) and is the core interface between the computer’s hardware and its processes.
The Linux kernel is used by Linux distributions alongside GNU tools and libraries. This combination is sometimes referred to as GNU/Linux.
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Steps To Upgrade Linux Kernel on Centos 7
To complete this guide, you must log in to your server as a non-root user with sudo privileges. To do this, you can follow our guide the Initial Server Setup with Centos 7.
Check the Current Linux Kernel Version
The first step is to check the version of your kernel. To do this, you can use the following command:
uname -msrIn your output you will see:
Output
Linux 3.10.0-1160.42.2.el7.x86_64 x86_64
Then, use the following command to update your Centos repository:
sudo yum -y updateAdd ELRepo Repository on Centos 7
To update the kernel on CentOS, you’ll need to install a third-party repository called ElRepo. ElRepo offers the latest kernel version available from kernel.org.
First, import the ElRepo GPG key with the following command:
sudo rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgThen, run the command below to add and install the ElRepo on Centos 7:
sudo rpm -Uvh https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpmWhen you are finished, you will get the following output:
Output
Retrieving https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
Preparing... ################################# [100%]
Updating / installing...
1:elrepo-release-7.0-6.el7.elrepo ################################# [100%]List Available Kernels on Centos 7
At this point, you can check for the available kernels on your server. To do this, run the command below:
yum list available --disablerepo='*' --enablerepo=elrepo-kernelIn your output you will see:
Output
elrepo-kernel | 3.0 kB 00:00
elrepo-kernel/primary_db | 2.1 MB 00:00
Available Packages
kernel-lt.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 5.4.217-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 6.0.0-1.el7.elrepo elrepo-kernel
perf.x86_64 5.19.12-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.19.12-1.el7.elrepo elrepo-kernelFrom your output, look at the right-hand column, and notice a series of letters and numbers (which looks something like ‘5.4.217-1.e17.elrepo’). This is the kernel version.
Use these two pieces of information to decide which kernel version you want to install. As you can see, the Linux 6 kernel is the latest mainline release.
Install the Latest Kernel on Centos 7
To install the latest mainline kernel on Centos 7, run the command below:
sudo yum --enablerepo=elrepo-kernel install kernel-mlOutput
Installed:
kernel-ml.x86_64 0:6.0.0-1.el7.elrepo
Complete!
To install the latest stable kernel, run the following command:
sudo yum --enablerepo=elrepo-kernel install kernel-ltOutput
Installed:
kernel-lt.x86_64 0:5.4.217-1.el7.elrepo
Complete!
Reboot and Choose the New Linux Kernel
At this point, you need to reboot your server:
rebootYou’ll be presented with the GRUB or boot menu.
Use the arrow keys to select the Linux kernel you have just installed, then press Enter. Your operating system should boot normally.
Set the Default Kernel Version on Centos 7
Once you confirm that the new kernel is compatible and working correctly, you’ll want to edit the GRUB boot utility so that, by default, it loads your new kernel.
Navigate to /etc/default/ and open the grub file with your text editor. Or, type the following in the terminal:
sudo vi /etc/default/grubOnce the file opens, look for the line that says GRUB_DEFAULT=X, and change it to GRUB_DEFAULT=0. This line will instruct the boot loader to default to the first kernel on the list, which is the latest.
Save the file, and then type the following command in the terminal to recreate the kernel configuration:
sudo grub2-mkconfig -o /boot/grub2/grub.cfgReboot once more:
rebootVerify that the boot loader is set to load the latest kernel by default.
Conclusion
At this point, you have learned to Upgrade Linux Kernel to the latest on Centos 7.
Hope you enjoy it.
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