You have centos 7.9 with an old kernel, 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
See ya!
