Can I use KernelCare on Linode?
I am running a Linode instance with WHM and CPanel and I am planning to buy and install Kernelcare software from CloudLinux. So I should be able to perform live Kernel updates without needing to reboot the server.
Would there be any problems with Linode's physical host if I'll be using this live updater? And will I actually be able to deploy Kernel live updates on my Linode without restarting it, since it's running on the physical host which has its own kernel?
In regards to the interaction between your Linode and its host, there shouldn't be any conflicts on the kernel level. The kernels of the host and guests are kept separate. This is how individual Linodes are all able to have their own kernels and distros. Implementing this update solution shouldn't run into any hardware issues.
I do have a couple of words of caution. First, since CloudLinux isn't one of our supported distros our ability to assist with troubleshooting is quite limited. Additionally, you will need to go through the process of installing a custom distro. On the same note, as WHM and Kernelcare are third-party products our ability to provide support for those is limited.
With that being said, if you do suspect that there might be a hardware issue feel free to open a support ticket and we will be happy to help you check.
there was a misunderstanding regarding CloudLinux part.
I don't use CloudLinux OS, I use CentOS 7.7 on my Linode and CloudLinux Network in this context is only a company that sells KernelCare software and it's compatible with CentOS7, so I don't think there is a need to use a custom distribution.
However, there was a problem with KernelCare when I installed it because my Linode used custom Kernel and it was showing Unknown kernel error.
I fixed this issue by updating my Linode configuration Kernel to GRUB2 and now the KernelCare detects effective Kernel 3.10.0-957.21.3.el7.x86_64 and it can be updated normally using KernelCare.
So far I don't have any issues and didn't get any warnings or Dashboard limitations, but I'm worried if using GRUB2 as the Kernel in Linode panel could make any problems long-term or pose any limitations of what I could do with my Linode, like resizing, backups, cloning, taking snapshots, IP transfer, migrating etc.?