Upgrade kernel version in Centos

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c, like:

[root@fss-a1 ~]# uname -r
3.10.0-1160.36.2.el7.x86_64

And you want to upgrade kernel version in Centos. Just execute:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel -y install kernel-lt
vim /etc/default/grub #change GRUB_DEFAULT=0
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

You should have something like (/etc/default/grub):

GRUB_TIMEOUT=1
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL="serial console"
GRUB_SERIAL_COMMAND="serial"
GRUB_CMDLINE_LINUX="console=tty0 crashkernel=auto net.ifnames=0 console=ttyS0"
GRUB_DISABLE_RECOVERY="true"

An output like:

[root@fss-a1 ~]# sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.4.142-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-5.4.142-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.36.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.36.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1127.19.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1127.19.1.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1127.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1127.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-cab9605edaa5484da7c2f02b8fd10762
Found initrd image: /boot/initramfs-0-rescue-cab9605edaa5484da7c2f02b8fd10762.img
done
[root@fss-a1 ~]# reboot

After reboot you will have the new kernel

[root@fss-a1 ~]# uname -r
5.4.142-1.el7.elrepo.x86_64

Thanks.