To update your centos  Server u need SSH access /Root / and  Internet  to add the needed repos.

This is my actual system :

to Update kernel to last release you have to add news Centos Repo

Now We’ll Start the procedure of Kernel upgrade on CentOS 7 :

We need to enable the ELRepo repository on CentOS 7, run the below commands :

[root@osradar ~]# rpm --import http://www.elrepo.org/RPM-GPG-KEY-elrepo.org
[root@osradar ~]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
Retrieving http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
Preparing... ################################# [100%]
Updating / installing...
1:elrepo-release-7.0-3.el7.elrepo ################################# [100%]
[root@osradar ~]#

and checkl  if repo had  beed  added with command  yum repolist

You can retrieve latest download links on official page here

Now we’ll install Kernel 4.17 with the below command :

** at the time kernel 4.17 was available as latest version, for latest versions the procedure will be the same.

[root@osradar ~]# yum --enablerepo=elrepo-kernel install kernel-ml -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.yourwebhoster.eu
* elrepo: mirrors.ircam.fr
* elrepo-kernel: mirrors.ircam.fr
* extras: mirror.yourwebhoster.eu
* updates: mirror.yourwebhoster.eu
elrepo-kernel | 2.9 kB 00:00:00 
elrepo-kernel/primary_db | 1.7 MB 00:00:00 
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:4.17.0-1.el7.elrepo will be installed
--> Finished Dependency Resolution

Now kernel 4.17 will downloaded and installed .

Now we need to add/modify config under /etc/default/grub :

vi  /etc/default/grub

And put this line or modify the line if  exists to :

GRUB_DEFAULT=0

[root@osradar ~]# cat /etc/default/grub
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
[root@osradar ~]#

Save   and exit  and run this command to create the kernel configs :

grub2-mkconfig -o /boot/grub2/grub.cfg

[root@osradar ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.17.0-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-4.17.0-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-862.3.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.3.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-862.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-77ba7edb9afc4a8cb0705febd9ed3064
Found initrd image: /boot/initramfs-0-rescue-77ba7edb9afc4a8cb0705febd9ed3064.img
done

That’s it.  now you can reboot your server and check the  new kernel  in the grub menu :

boot  , login and check if  system start   without issues

Please  Enjoy

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