Ksplice

Ksplice is a technology that allows for updating a running Linux kernel without requiring a reboot. It works by patching the kernel in place, applying security fixes and other critical updates while the system continues to operate. This eliminates downtime associated with traditional kernel updates, which typically necessitate a system reboot.

Ksplice functions by identifying the necessary changes between the original vulnerable kernel code and the patched version. It then compiles these changes into a module that can be dynamically loaded into the running kernel. This module redirects execution from the original code to the patched code, effectively replacing the vulnerable sections without interrupting the system's operation.

The technology was originally developed at MIT by Jeff Arnold and Anders Kaseorg. It was subsequently acquired by Oracle in 2011 and integrated into Oracle Linux.

Ksplice offers benefits such as improved system uptime, reduced maintenance windows, and faster deployment of critical security fixes. It is particularly valuable in environments where downtime is costly or unacceptable, such as high-availability servers, cloud computing platforms, and critical infrastructure systems. However, it is important to note that Ksplice is not a universal solution and may not be compatible with all kernel versions or configurations.