This Tutorial is about how to update your centos7 to the latest kernel release. any new kernels is coming wit bug fixes , security fixes and new hardware drivers support.
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
