The information that is being provided here is regarding the way by which cPanel-provided hardened kernel can be manually replaced with a standard kernel. It needs to be mentioned that the cPanel-provided hardened kernel was deprecated in cPanel & WHM version 68. Hence, updates to this kernel are not provided any more. It is strongly recommended that the hardened kernel be removed. It also needs to be mentioned that the server will need to be rebooted during this procedure. Hence, the downtime needs to be planned accordingly.
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How to Manually
Remove the Kernel?
The below-mentioned steps need to be carried out
for manually replacing the cPanel-provided hardened kernel with a standard
kernel.
1: Log in to your server. This has to be done vis
SSH.
2: The following commands need to be run:
- rm /etc/yum.repos.d/cPkernel.repo
- yum list --showduplicates kernel
A list of available kernels is returned by the
system. These kernels can be installed.
- [root@c6 ~]# yum list --showduplicates kernel
- Loaded plugins: fastestmirror
- Loading mirror speeds from cached hostfile
- * base: reflector.westga.edu
- * epel: mirror.compevo.com
- * extras: ftp.osuosl.org
- * updates: dallas.tx.mirror.xygenhosting.com
- Installed Packages
- kernel.x86_64
3: If a specific kernel needs to be installed, then the following command needs to be run:
yum install KERNELNAME
In it “KERNELNAME” represents the desired kernel.
Alternatively, the command, yum install kernel-2.6.32 needs to be run for
installing the latest kernel.
- [root@c6 ~]# yum install kernel-2.6.32
- Loaded plugins: fastestmirror
- Setting up Install Process
- Loading mirror speeds from cached hostfile
- * base: reflector.westga.edu
- * epel: mirror.compevo.com
- * extras: ftp.osuosl.org
- * updates: dallas.tx.mirror.xygenhosting.com
- Resolving Dependencies
- --> Running transaction check
- ---> Package kernel.x86_64 0:2.6.32-696.16.1.el6 will be installed
- --> Finished Dependency Resolution
- Dependencies Resolved
- Package Arch Version Repository Size
- Installing:
- Kernel x86_64 2.6.32-696.16.1.el6 updates 32M
- Transaction Summary
- Install 1 Package(s)
- Total download size: 32 M
- Installed size: 131 M
- Is this ok [y/N]: y
- Downloading Packages:
- kernel-2.6.32-696.16.1.el6.x86_64.rpm | 32 MB 00:11
- Running rpm_check_debug
- Running Transaction Test
- Transaction Test Succeeded
- Running Transaction
- Installing : kernel-2.6.32-696.16.1.el6.x86_64 1/1
- Verifying : kernel-2.6.32-696.16.1.el6.x86_64 1/1
- Installed:
- kernel.x86_64 0:2.6.32-696.16.1.el6
- Complete!
4: The reboot command needs to be run to reboot the
server.
5: Once the server reboots, you need to log in once
again to your server via SSH. Then the command, uname -r needs to be run.
The output is supposed to resemble the following:
2.6.32-696.13.2.el6.x86_64
It is recommended that you navigate to the
Security Advisor interface in WHM, after the hardened kernel has been replaced.
Post that, install the KernelCare’s free symlink protection from
CloudLinux.
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