# Installation of KernelCare

KernelCare is compatible with 64-bit versions of CentOS/RHEL 6.x and 7.x, CloudLinux 6.x and 7.x, Virtuozzo/PCS/OpenVZ 2.6.32, Debian 8 and 9, Proxmox VE 4, Virt-SIG/Xen4CentOS 6 and 7, Ubuntu 14.04, 15.04 and 16.04 kernels. The list of compatible kernels can be found on the following link: https://patches.kernelcare.com/ .

To install KernelCare run:

curl -s https://repo.cloudlinux.com/kernelcare/kernelcare_install.sh | bash

or:

wget -qq -O - https://repo.cloudlinux.com/kernelcare/kernelcare_install.sh | bash

If you are using IP-based license, nothing else required to be done.

If you are using key-based license, run:

$ /usr/bin/kcarectl --register KEY

If you are experiencing Key limit reached error after the end of the trial period you should first unregister the server by running:

kcarectl --unregister

To check if patches applied run:

$ /usr/bin/kcarectl --info

The software will automatically check for new patches every 4 hours.

If you would like to run update manually:

$ /usr/bin/kcarectl --update

To check current kernel compatibility with KernelCare use the following script by running:

curl -s https://raw.githubusercontent.com/iseletsk/kernelchecker/master/py/kc-compat.py | python

or:

wget -qq -O - https://raw.githubusercontent.com/iseletsk/kernelchecker/master/py/kc-compat.py | python

More information can be found on the link: https://www.kernelcare.com/faq/

# Switching from Ksplice

To switch from Ksplice to KernelCare, use the following script, which uninstalls Ksplice and installs KernelCare itself instead.

It will automatically detect and abort if the system is not 64-bit (as KernelCare doesn't support that).

It will also detects when Ksplice module cannot be uninstalled, and retries multiple times.

Download the script here: http://patches.kernelcare.com/ksplice2kcare .

Run the command:

$ bash ksplice2kcare $KERNELCARE_KEY$

The key can be created/retrieved in KernelCare Keys section of CLN.

If you want to use IP based licenses run:

$ bash ksplice2kcare IP

You have to add IP license for that server, and it is just two letters: IP, not the actual IP.

By default the script will attempt 3 times to uninstall ksplice, waiting 60 seconds in between. You can run it using nohup if you don't want to wait.

You can change that by editing the script and changing RETRY and SLEEP values.

The script will exit with exit code 0 and message Done on success. Otherwise it will produce exit code -1.

Complete log file can be found at /var/log/ksplice2kcare.log.