In-Memory Compared to On-Disk Updates

A Ksplice update occurs in memory and takes effect immediately upon application, which is different than an on-disk change that requires a reboot. However, you must continue to apply on-disk updates, even when using Ksplice, to ensure that updated package binaries can be used if the system or processes restart. On-disk updates are handled by subscribing to Unbreakable Linux Network (ULN) or by using a local ULN mirror.

Ksplice patches keep a system updated while it's running, but you must continue to install the regular kernel packages for released errata from ULN or the Oracle Linux Yum server so that the kernel is also updated on disk. The system is then ready for the next maintenance window or reboot. When you restart the system, you can boot it from the newer kernel version. Ksplice then uses the new kernel as a baseline for applying patches when they become available.